Release 0.20.0-alpha5 (#1315 )

X11: Sync key press/release with window focus (#1296 )
* X11: Sync key press/release with window focus * When a window loses focus, key release events are issued for all pressed keys * When a window gains focus, key press events are issued for all pressed keys * Adds `is_synthetic` field to `WindowEvent` variant `KeyboardInput` to indicate that these events are synthetic. * Adds `is_synthetic: false` to `WindowEvent::KeyboardInput` events issued on all other platforms * Clarify code with comments
2026-06-27 07:03:15 -04:00 · 2019-12-09 17:29:50 -07:00 · 2019-12-07 15:51:37 -07:00 · 2019-12-07 10:22:03 -07:00 · 2019-12-04 10:18:20 -07:00 · 2019-12-04 12:02:33 -05:00
91 changed files with 6009 additions and 3279 deletions
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -1,6 +1,7 @@
 - [ ] Tested on all platforms changed
 - [ ] Compilation warnings were addressed
 - [ ] `cargo fmt` has been run on this branch
+- [ ] `cargo doc` builds successfully
 - [ ] Added an entry to `CHANGELOG.md` if knowledge of this change could be valuable to users
 - [ ] Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
 - [ ] Created or updated an example program if it would help users understand this functionality
--- a/.gitignore
+++ b/.gitignore
@@ -2,5 +2,9 @@ Cargo.lock
 target/
 rls/
 .vscode/
+util/
 *~
+*.wasm
+*.ts
+*.js
 #*#
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,6 +58,21 @@ matrix:
      os: osx
      rust: stable

+    # wasm stdweb
+    - env: TARGET=wasm32-unknown-unknown WEB=web FEATURES=stdweb
+      os: linux
+      rust: stable
+    - env: TARGET=wasm32-unknown-unknown WEB=web FEATURES=stdweb
+      os: linux
+      rust: nightly
+    # wasm web-sys
+    - env: TARGET=wasm32-unknown-unknown FEATURES=web-sys
+      os: linux
+      rust: stable
+    - env: TARGET=wasm32-unknown-unknown FEATURES=web-sys
+      os: linux
+      rust: nightly
+
 install:
  - rustup self update
  - rustup target add $TARGET; true
@@ -66,11 +81,21 @@ install:

 script:
  - cargo +stable fmt --all -- --check
-  - cargo build --target $TARGET --verbose
-  - cargo build --target $TARGET --features serde --verbose
+  # Ensure that the documentation builds properly.
+  - cargo doc --no-deps
+  # Install cargo-web to build stdweb
+  - if [[ $WEB = "web" ]]; then cargo install -f cargo-web; fi
+  # Build without serde then with serde
+  - if [[ -z "$FEATURES" ]]; then
+      cargo $WEB build --target $TARGET --verbose;
+    else
+      cargo $WEB build --target $TARGET --features $FEATURES --verbose;
+    fi
+  - cargo $WEB build --target $TARGET --features serde,$FEATURES --verbose
  # Running iOS apps on macOS requires the Simulator so we skip that for now
-  - if [[ $TARGET != *-apple-ios ]]; then cargo test --target $TARGET --verbose; fi
-  - if [[ $TARGET != *-apple-ios ]]; then cargo test --target $TARGET --features serde --verbose; fi
+  # The web targets also don't support running tests
+  - if [[ $TARGET != *-apple-ios && $TARGET != wasm32-* ]]; then cargo test --target $TARGET --verbose; fi
+  - if [[ $TARGET != *-apple-ios && $TARGET != wasm32-* ]]; then cargo test --target $TARGET --features serde --verbose; fi

 after_success:
  - |
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,64 @@
 # Unreleased

+# # 0.20.0 Alpha 5 (2019-12-09)
+
+- On macOS, fix application termination on `ControlFlow::Exit`
+- On Windows, fix missing `ReceivedCharacter` events when Alt is held.
+- On macOS, stop emitting private corporate characters in `ReceivedCharacter` events.
+- On X11, fix misreporting DPI factor at startup.
+- On X11, fix events not being reported when using `run_return`.
+- On X11, fix key modifiers being incorrectly reported.
+- On X11, fix window creation hanging when another window is fullscreen.
+- On Windows, fix focusing unfocused windows when switching from fullscreen to windowed.
+- On X11, fix reporting incorrect DPI factor when waking from suspend.
+- Change `EventLoopClosed` to contain the original event.
+- Add `is_synthetic` field to `WindowEvent` variant `KeyboardInput`,
+  indicating that the event is generated by winit.
+- On X11, generate synthetic key events for keys held when a window gains or loses focus.
+
+# 0.20.0 Alpha 4 (2019-10-18)
+
+- Add web support via the 'stdweb' or 'web-sys' features
+- On Windows, implemented function to get HINSTANCE
+- On macOS, implement `run_return`.
+- On iOS, fix inverted parameter in `set_prefers_home_indicator_hidden`.
+- On X11, performance is improved when rapidly calling `Window::set_cursor_icon`.
+- On iOS, fix improper `msg_send` usage that was UB and/or would break if `!` is stabilized.
+- On Windows, unset `maximized` when manually changing the window's position or size.
+- On Windows, add touch pressure information for touch events.
+- On macOS, differentiate between `CursorIcon::Grab` and `CursorIcon::Grabbing`.
+- On Wayland, fix event processing sometimes stalling when using OpenGL with vsync.
+- Officially remove the Emscripten backend.
+- On Windows, fix handling of surrogate pairs when dispatching `ReceivedCharacter`.
+- On macOS 10.15, fix freeze upon exiting exclusive fullscreen mode.
+- On iOS, fix panic upon closing the app.
+- On X11, allow setting mulitple `XWindowType`s.
+- On iOS, fix null window on initial `HiDpiFactorChanged` event.
+- On Windows, fix fullscreen window shrinking upon getting restored to a normal window.
+- On macOS, fix events not being emitted during modal loops, such as when windows are being resized
+  by the user.
+- On Windows, fix hovering the mouse over the active window creating an endless stream of CursorMoved events.
+- Always dispatch a `RedrawRequested` event after creating a new window.
+- On X11, return dummy monitor data to avoid panicking when no monitors exist.
+- On X11, prevent stealing input focus when creating a new window.
+  Only steal input focus when entering fullscreen mode.
+- On Wayland, add support for set_cursor_visible and set_cursor_grab.
+- On Wayland, fixed DeviceEvents for relative mouse movement is not always produced.
+- Removed `derivative` crate dependency.
+- On Wayland, add support for set_cursor_icon.
+- Use `impl Iterator<Item = MonitorHandle>` instead of `AvailableMonitorsIter` consistently.
+- On macOS, fix fullscreen state being updated after entering fullscreen instead of before,
+  resulting in `Window::fullscreen` returning the old state in `Resized` events instead of
+  reflecting the new fullscreen state
+- On X11, fix use-after-free during window creation
+- On Windows, disable monitor change keyboard shortcut while in exclusive fullscreen.
+- On Windows, ensure that changing a borderless fullscreen window's monitor via keyboard shortcuts keeps the window fullscreen on the new monitor.
+- Prevent `EventLoop::new` and `EventLoop::with_user_event` from getting called outside the main thread.
+  - This is because some platforms cannot run the event loop outside the main thread. Preventing this
+    reduces the potential for cross-platform compatibility gotchyas.
+- On Windows and Linux X11/Wayland, add platform-specific functions for creating an `EventLoop` outside the main thread.
+- On Wayland, drop resize events identical to the current window size.
+
 # 0.20.0 Alpha 3 (2019-08-14)

 - On macOS, drop the run closure on exit.
@@ -27,6 +86,10 @@
 - On iOS, add touch pressure information for touch events.
 - Implement `raw_window_handle::HasRawWindowHandle` for `Window` type on all supported platforms.
 - On macOS, fix the signature of `-[NSView drawRect:]`.
+- On iOS, fix the behavior of `ControlFlow::Poll`. It wasn't polling if that was the only mode ever used by the application.
+- On iOS, fix DPI sent out by views on creation was `0.0` - now it gives a reasonable number.
+- On iOS, RedrawRequested now works for gl/metal backed views.
+- On iOS, RedrawRequested is generally ordered after EventsCleared.

 # 0.20.0 Alpha 2 (2019-07-09)

--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "winit"
-version = "0.20.0-alpha3"
+version = "0.20.0-alpha5"
 authors = ["The winit contributors", "Pierre Krieger <pierre.krieger1708@gmail.com>"]
 description = "Cross-platform window creation library."
 edition = "2018"
@@ -14,13 +14,17 @@ categories = ["gui"]
 [package.metadata.docs.rs]
 features = ["serde"]

+[features]
+web-sys = ["web_sys", "wasm-bindgen", "instant/wasm-bindgen"]
+stdweb = ["std_web", "instant/stdweb"]
+
 [dependencies]
+instant = "0.1"
 lazy_static = "1"
-libc = "0.2"
+libc = "0.2.64"
 log = "0.4"
 serde = { version = "1", optional = true, features = ["serde_derive"] }
-derivative = "1.0.2"
-raw-window-handle = "0.1"
+raw-window-handle = "0.3"

 [dev-dependencies]
 image = "0.21"
@@ -33,7 +37,7 @@ version = "0.2"
 objc = "0.2.3"

 [target.'cfg(target_os = "macos")'.dependencies]
-cocoa = "0.18.4"
+cocoa = "0.19.1"
 core-foundation = "0.6"
 core-graphics = "0.17.3"
 dispatch = "0.1.4"
@@ -79,4 +83,37 @@ x11-dl = "2.18.3"
 percent-encoding = "2.0"

 [target.'cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "openbsd", target_os = "netbsd", target_os = "windows"))'.dependencies.parking_lot]
-version = "0.9"
+version = "0.10"
+
+[target.'cfg(target_arch = "wasm32")'.dependencies.web_sys]
+package = "web-sys"
+version = "0.3.22"
+optional = true
+features = [
+    'console',
+    'BeforeUnloadEvent',
+    'Document',
+    'DomRect',
+    'Element',
+    'Event',
+    'EventTarget',
+    'FocusEvent',
+    'HtmlCanvasElement',
+    'HtmlElement',
+    'KeyboardEvent',
+    'MouseEvent',
+    'Node',
+    'PointerEvent',
+    'Window',
+    'WheelEvent'
+]
+
+[target.'cfg(target_arch = "wasm32")'.dependencies.wasm-bindgen]
+version = "0.2.45"
+optional = true
+
+[target.'cfg(target_arch = "wasm32")'.dependencies.std_web]
+package = "stdweb"
+version = "=0.4.20"
+optional = true
+features = ["experimental_features_which_may_break_on_minor_version_bumps"]
--- a/FEATURES.md
+++ b/FEATURES.md
@@ -12,7 +12,6 @@ be used to create both games and applications. It supports the main graphical pl
  - iOS
  - Android
 - Web
-  - via Emscripten
  - via WASM

 Most platforms expose capabilities that cannot be meaningfully transposed onto others. Winit does not
@@ -134,6 +133,7 @@ If your PR makes notable changes to Winit's features, please update this section
 * Base window size

 ### iOS
+* `winit` has a minimum OS requirement of iOS 8
 * Get the `UIWindow` object pointer
 * Get the `UIViewController` object pointer
 * Get the `UIView` object pointer
@@ -161,57 +161,57 @@ Legend:
 - ❓: Unknown status

 ### Windowing
-|Feature                          |Windows|MacOS   |Linux x11   |Linux Wayland  |Android|iOS    |Emscripten|
+|Feature                          |Windows|MacOS   |Linux x11   |Linux Wayland  |Android|iOS    |WASM      |
 |-------------------------------- | ----- | ----   | -------    | -----------   | ----- | ----- | -------- |
-|Window initialization            |✔️     |✔️     |▢[#5]      |✔️             |▢[#33]|▢[#33] |❓        |
-|Providing pointer to init OpenGL |✔️     |✔️     |✔️         |✔️             |✔️     |✔️    |❓        |
-|Providing pointer to init Vulkan |✔️     |✔️     |✔️         |✔️             |✔️     |❓     |**N/A**   |
-|Window decorations               |✔️     |✔️     |✔️         |▢[#306]        |**N/A**|**N/A**|**N/A**   |
-|Window decorations toggle        |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**   |
-|Window resizing                  |✔️     |▢[#219]|✔️         |▢[#306]        |**N/A**|**N/A**|❓        |
-|Window resize increments         |❌     |❌     |❌         |❌             |❌    |❌     |❌        |
-|Window transparency              |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**   |
-|Window maximization              |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**   |
-|Window maximization toggle       |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**   |
-|Fullscreen                       |✔️     |✔️     |✔️         |✔️             |**N/A**|✔️     |❌        |
-|Fullscreen toggle                |✔️     |✔️     |✔️         |✔️             |**N/A**|✔️     |❌        |
-|Exclusive fullscreen             |✔️     |✔️     |✔️         |**N/A**         |❌    |✔️     |❌        |
-|HiDPI support                    |✔️     |✔️     |✔️         |✔️             |▢[#721]|✔️    |✔️         |
-|Popup windows                    |❌     |❌     |❌         |❌             |❌    |❌     |❌        |
+|Window initialization            |✔️     |✔️     |▢[#5]      |✔️             |▢[#33]|▢[#33] |✔️        |
+|Providing pointer to init OpenGL |✔️     |✔️     |✔️         |✔️             |✔️     |✔️    |**N/A**|
+|Providing pointer to init Vulkan |✔️     |✔️     |✔️         |✔️             |✔️     |❓     |**N/A**|
+|Window decorations               |✔️     |✔️     |✔️         |▢[#306]        |**N/A**|**N/A**|**N/A**|
+|Window decorations toggle        |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**|
+|Window resizing                  |✔️     |▢[#219]|✔️         |▢[#306]        |**N/A**|**N/A**|✔️        |
+|Window resize increments         |❌     |❌     |❌         |❌             |❌    |❌     |**N/A**|
+|Window transparency              |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|N/A        |
+|Window maximization              |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**|
+|Window maximization toggle       |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**|
+|Fullscreen                       |✔️     |✔️     |✔️         |✔️             |**N/A**|✔️     |✔️        |
+|Fullscreen toggle                |✔️     |✔️     |✔️         |✔️             |**N/A**|✔️     |✔️        |
+|Exclusive fullscreen             |✔️     |✔️     |✔️         |**N/A**         |❌    |✔️     |**N/A**|
+|HiDPI support                    |✔️     |✔️     |✔️         |✔️             |▢[#721]|✔️    |**N/A**|
+|Popup windows                    |❌     |❌     |❌         |❌             |❌    |❌     |**N/A**|

 ### System information
-|Feature          |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS    |Emscripten|
-|---------------- | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
-|Monitor list     |✔️    |✔️    |✔️       |✔️          |**N/A**|✔️     |**N/A**   |
-|Video mode query |✔️    |✔️    |✔️       |✔️          |❌      |✔️     |❌         |
+|Feature          |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS      |WASM      |
+|---------------- | ----- | ---- | ------- | ----------- | ----- | ------- | -------- |
+|Monitor list     |✔️    |✔️    |✔️       |✔️          |**N/A**|✔️       |**N/A**|
+|Video mode query |✔️    |✔️    |✔️       |✔️          |❌     |✔️      |**N/A**|

 ### Input handling
-|Feature                 |Windows   |MacOS   |Linux x11|Linux Wayland|Android|iOS    |Emscripten|
+|Feature                 |Windows   |MacOS   |Linux x11|Linux Wayland|Android|iOS    |WASM      |
 |----------------------- | -----    | ----   | ------- | ----------- | ----- | ----- | -------- |
-|Mouse events            |✔️       |▢[#63]  |✔️       |✔️          |**N/A**|**N/A**|✔️       |
-|Mouse set location      |✔️       |✔️      |✔️       |❓           |**N/A**|**N/A**|**N/A**  |
-|Cursor grab             |✔️       |▢[#165] |▢[#242]  |❌[#306]    |**N/A**|**N/A**|✔️       |
-|Cursor icon             |✔️       |✔️      |✔️       |❌[#306]    |**N/A**|**N/A**|❌       |
-|Touch events            |✔️       |❌      |✔️       |✔️          |✔️    |✔️     |✔️       |
-|Touch pressure          |❌       |❌      |❌       |❌          |❌     |✔️     |❌       |
-|Multitouch              |✔️       |❌      |✔️       |✔️          |❓     |✔️     |❌       |
-|Keyboard events         |✔️       |✔️      |✔️       |✔️          |❓     |❌     |✔️       |
+|Mouse events            |✔️       |▢[#63]  |✔️       |✔️          |**N/A**|**N/A**|✔️        |
+|Mouse set location      |✔️       |✔️      |✔️       |❓           |**N/A**|**N/A**|**N/A**|
+|Cursor grab             |✔️       |▢[#165] |▢[#242]  |✔️         |**N/A**|**N/A**|❓        |
+|Cursor icon             |✔️       |✔️      |✔️       |✔️           |**N/A**|**N/A**|✔️        |
+|Touch events            |✔️       |❌      |✔️       |✔️          |✔️    |✔️     |✔️        |
+|Touch pressure          |✔️       |❌      |❌       |❌          |❌    |✔️     |✔️        |
+|Multitouch              |✔️       |❌      |✔️       |✔️          |❓     |✔️     |✔️        |
+|Keyboard events         |✔️       |✔️      |✔️       |✔️          |❓     |❌     |✔️        |
 |Drag & Drop             |▢[#720]  |▢[#720] |▢[#720]  |❌[#306]    |**N/A**|**N/A**|❓        |
-|Raw Device Events       |▢[#750]  |▢[#750] |▢[#750]  |❌          |❌    |❌     |❌       |
-|Gamepad/Joystick events |❌[#804] |❌      |❌       |❌          |❌    |❌     |❌       |
-|Device movement events  |❓        |❓       |❓       |❓           |❌    |❌     |❌       |
+|Raw Device Events       |▢[#750]  |▢[#750] |▢[#750]  |❌          |❌    |❌     |❓        |
+|Gamepad/Joystick events |❌[#804] |❌      |❌       |❌          |❌    |❌     |❓        |
+|Device movement events  |❓        |❓       |❓       |❓           |❌    |❌     |❓        |

 ### Pending API Reworks
 Changes in the API that have been agreed upon but aren't implemented across all platforms.

-|Feature                             |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS    |Emscripten|
+|Feature                             |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS    |WASM      |
 |------------------------------      | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
-|New API for HiDPI ([#315] [#319])   |✔️    |✔️    |✔️       |✔️          |▢[#721]|✔️    |✔️       |
-|Event Loop 2.0 ([#459])             |✔️    |✔️    |❌       |✔️          |❌     |✔️     |❌       |
-|Keyboard Input ([#812])             |❌    |❌    |❌       |❌          |❌     |❌     |❌      |
+|New API for HiDPI ([#315] [#319])   |✔️    |✔️    |✔️       |✔️          |▢[#721]|✔️    |❓        |
+|Event Loop 2.0 ([#459])             |✔️    |✔️    |❌       |✔️          |❌     |✔️    |❓        |
+|Keyboard Input ([#812])             |❌    |❌    |❌       |❌          |❌     |❌    |❓        |

 ### Completed API Reworks
-|Feature                             |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS    |Emscripten|
+|Feature                             |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS    |WASM      |
 |------------------------------      | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |

 [#165]: https://github.com/rust-windowing/winit/issues/165
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@

 ```toml
 [dependencies]
-winit = "0.20.0-alpha3"
+winit = "0.20.0-alpha4"
 ```

 ## [Documentation](https://docs.rs/winit)
@@ -66,7 +66,7 @@ Winit provides the following features, which can be enabled in your `Cargo.toml`

 ### Platform-specific usage

-#### Emscripten and WebAssembly
+#### WebAssembly

 Building a binary will yield a `.js` file. In order to use it in an HTML file, you need to:

--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,13 +1,24 @@
 environment:
  matrix:
-  - TARGET: x86_64-pc-windows-msvc
-    CHANNEL: nightly
  - TARGET: x86_64-pc-windows-msvc
    CHANNEL: stable
  - TARGET: i686-pc-windows-msvc
+    CHANNEL: stable
+  - TARGET: x86_64-pc-windows-gnu
+    CHANNEL: stable
+  - TARGET: i686-pc-windows-gnu
+    CHANNEL: stable
+  - TARGET: x86_64-pc-windows-msvc
+    CHANNEL: nightly
+  - TARGET: i686-pc-windows-msvc
+    CHANNEL: nightly
+  - TARGET: x86_64-pc-windows-gnu
    CHANNEL: nightly
  - TARGET: i686-pc-windows-gnu
    CHANNEL: nightly
+matrix:
+  allow_failures:
+    - CHANNEL: nightly
 install:
  - appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
  - rustup-init -yv --default-toolchain %CHANNEL% --default-host %TARGET%
@@ -21,3 +32,4 @@ build: false
 test_script:
  - cargo test --verbose
  - cargo test --features serde --verbose
+  - cargo doc --no-deps
--- a/examples/custom_events.rs
+++ b/examples/custom_events.rs
@@ -1,15 +1,16 @@
-use winit::{
-    event::{Event, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
-    window::WindowBuilder,
-};
-
-#[derive(Debug, Clone, Copy)]
-enum CustomEvent {
-    Timer,
-}
-
+#[cfg(not(target_arch = "wasm32"))]
 fn main() {
+    use winit::{
+        event::{Event, WindowEvent},
+        event_loop::{ControlFlow, EventLoop},
+        window::WindowBuilder,
+    };
+
+    #[derive(Debug, Clone, Copy)]
+    enum CustomEvent {
+        Timer,
+    }
+
    let event_loop = EventLoop::<CustomEvent>::with_user_event();

    let _window = WindowBuilder::new()
@@ -39,3 +40,8 @@ fn main() {
        _ => *control_flow = ControlFlow::Wait,
    });
 }
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    panic!("This example is not supported on web.");
+}
--- a/examples/monitor_list.rs
+++ b/examples/monitor_list.rs
@@ -4,6 +4,6 @@ fn main() {
    let event_loop = EventLoop::new();
    let window = WindowBuilder::new().build(&event_loop).unwrap();

-    dbg!(window.available_monitors());
+    dbg!(window.available_monitors().collect::<Vec<_>>());
    dbg!(window.primary_monitor());
 }
--- a/examples/multithreaded.rs
+++ b/examples/multithreaded.rs
@@ -1,16 +1,18 @@
-extern crate env_logger;
-use std::{collections::HashMap, sync::mpsc, thread, time::Duration};
-
-use winit::{
-    event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
-    window::{CursorIcon, Fullscreen, WindowBuilder},
-};
-
-const WINDOW_COUNT: usize = 3;
-const WINDOW_SIZE: (u32, u32) = (600, 400);
-
+#[cfg(not(target_arch = "wasm32"))]
 fn main() {
+    extern crate env_logger;
+
+    use std::{collections::HashMap, sync::mpsc, thread, time::Duration};
+
+    use winit::{
+        event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
+        event_loop::{ControlFlow, EventLoop},
+        window::{CursorIcon, Fullscreen, WindowBuilder},
+    };
+
+    const WINDOW_COUNT: usize = 3;
+    const WINDOW_SIZE: (u32, u32) = (600, 400);
+
    env_logger::init();
    let event_loop = EventLoop::new();
    let mut window_senders = HashMap::with_capacity(WINDOW_COUNT);
@@ -59,7 +61,7 @@ fn main() {
                    } => {
                        window.set_title(&format!("{:?}", key));
                        let state = !modifiers.shift;
-                        use self::VirtualKeyCode::*;
+                        use VirtualKeyCode::*;
                        match key {
                            A => window.set_always_on_top(state),
                            C => window.set_cursor_icon(match state {
@@ -167,3 +169,8 @@ fn main() {
        }
    })
 }
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    panic!("Example not supported on Wasm");
+}
--- a/examples/request_redraw.rs
+++ b/examples/request_redraw.rs
@@ -1,4 +1,5 @@
-use std::time::{Duration, Instant};
+use instant::Instant;
+use std::time::Duration;

 use winit::{
    event::{Event, WindowEvent},
--- a/examples/timer.rs
+++ b/examples/timer.rs
@@ -1,4 +1,5 @@
-use std::time::{Duration, Instant};
+use instant::Instant;
+use std::time::Duration;
 use winit::{
    event::{Event, StartCause, WindowEvent},
    event_loop::{ControlFlow, EventLoop},
--- a/examples/window_debug.rs
+++ b/examples/window_debug.rs
@@ -0,0 +1,121 @@
+// This example is used by developers to test various window functions.
+
+use winit::{
+    dpi::{LogicalSize, PhysicalSize},
+    event::{DeviceEvent, ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+    window::{Fullscreen, WindowBuilder},
+};
+
+fn main() {
+    let event_loop = EventLoop::new();
+
+    let window = WindowBuilder::new()
+        .with_title("A fantastic window!")
+        .with_inner_size(LogicalSize::from((100, 100)))
+        .build(&event_loop)
+        .unwrap();
+
+    eprintln!("debugging keys:");
+    eprintln!("  (E) Enter exclusive fullscreen");
+    eprintln!("  (F) Toggle borderless fullscreen");
+    #[cfg(waiting_for_set_minimized)]
+    eprintln!("  (M) Toggle minimized");
+    eprintln!("  (Q) Quit event loop");
+    eprintln!("  (V) Toggle visibility");
+    eprintln!("  (X) Toggle maximized");
+
+    #[cfg(waiting_for_set_minimized)]
+    let mut minimized = false;
+    let mut maximized = false;
+    let mut visible = true;
+
+    event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::DeviceEvent {
+                event:
+                    DeviceEvent::Key(KeyboardInput {
+                        virtual_keycode: Some(key),
+                        state: ElementState::Pressed,
+                        ..
+                    }),
+                ..
+            } => match key {
+                #[cfg(waiting_for_set_minimized)]
+                VirtualKeyCode::M => {
+                    if minimized {
+                        minimized = !minimized;
+                        window.set_minimized(minimized);
+                    }
+                }
+                VirtualKeyCode::V => {
+                    if !visible {
+                        visible = !visible;
+                        window.set_visible(visible);
+                    }
+                }
+                _ => (),
+            },
+            Event::WindowEvent {
+                event: WindowEvent::KeyboardInput { input, .. },
+                ..
+            } => match input {
+                KeyboardInput {
+                    virtual_keycode: Some(key),
+                    state: ElementState::Pressed,
+                    ..
+                } => match key {
+                    VirtualKeyCode::E => {
+                        fn area(size: PhysicalSize) -> f64 {
+                            size.width * size.height
+                        }
+
+                        let monitor = window.current_monitor();
+                        if let Some(mode) = monitor.video_modes().max_by(|a, b| {
+                            area(a.size())
+                                .partial_cmp(&area(b.size()))
+                                .expect("NaN in video mode size")
+                        }) {
+                            window.set_fullscreen(Some(Fullscreen::Exclusive(mode)));
+                        } else {
+                            eprintln!("no video modes available");
+                        }
+                    }
+                    VirtualKeyCode::F => {
+                        if window.fullscreen().is_some() {
+                            window.set_fullscreen(None);
+                        } else {
+                            let monitor = window.current_monitor();
+                            window.set_fullscreen(Some(Fullscreen::Borderless(monitor)));
+                        }
+                    }
+                    #[cfg(waiting_for_set_minimized)]
+                    VirtualKeyCode::M => {
+                        minimized = !minimized;
+                        window.set_minimized(minimized);
+                    }
+                    VirtualKeyCode::Q => {
+                        *control_flow = ControlFlow::Exit;
+                    }
+                    VirtualKeyCode::V => {
+                        visible = !visible;
+                        window.set_visible(visible);
+                    }
+                    VirtualKeyCode::X => {
+                        maximized = !maximized;
+                        window.set_maximized(maximized);
+                    }
+                    _ => (),
+                },
+                _ => (),
+            },
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                window_id,
+            } if window_id == window.id() => *control_flow = ControlFlow::Exit,
+            _ => (),
+        }
+    });
+}
--- a/examples/window_run_return.rs
+++ b/examples/window_run_return.rs
@@ -9,48 +9,50 @@
    target_os = "openbsd"
 ))]
 fn main() {
+    use std::{thread::sleep, time::Duration};
    use winit::{
        event::{Event, WindowEvent},
        event_loop::{ControlFlow, EventLoop},
        platform::desktop::EventLoopExtDesktop,
        window::WindowBuilder,
    };
-
    let mut event_loop = EventLoop::new();

-    let window = WindowBuilder::new()
+    let _window = WindowBuilder::new()
        .with_title("A fantastic window!")
        .build(&event_loop)
        .unwrap();

-    println!("Close the window to continue.");
-    event_loop.run_return(|event, _, control_flow| match event {
-        Event::WindowEvent {
-            event: WindowEvent::CloseRequested,
-            ..
-        } => *control_flow = ControlFlow::Exit,
-        _ => *control_flow = ControlFlow::Wait,
-    });
-    drop(window);
+    let mut quit = false;

-    let _window_2 = WindowBuilder::new()
-        .with_title("A second, fantasticer window!")
-        .build(&event_loop)
-        .unwrap();
+    while !quit {
+        event_loop.run_return(|event, _, control_flow| {
+            if let Event::WindowEvent { event, .. } = &event {
+                // Print only Window events to reduce noise
+                println!("{:?}", event);
+            }

-    println!("Wa ha ha! You thought that closing the window would finish this?!");
-    event_loop.run_return(|event, _, control_flow| match event {
-        Event::WindowEvent {
-            event: WindowEvent::CloseRequested,
-            ..
-        } => *control_flow = ControlFlow::Exit,
-        _ => *control_flow = ControlFlow::Wait,
-    });
+            match event {
+                Event::WindowEvent {
+                    event: WindowEvent::CloseRequested,
+                    ..
+                } => {
+                    quit = true;
+                    *control_flow = ControlFlow::Exit;
+                }
+                Event::EventsCleared => {
+                    *control_flow = ControlFlow::Exit;
+                }
+                _ => *control_flow = ControlFlow::Wait,
+            }
+        });

-    println!("Okay we're done now for real.");
+        // Sleep for 1/60 second to simulate rendering
+        sleep(Duration::from_millis(16));
+    }
 }

-#[cfg(any(target_os = "ios", target_os = "android", target_os = "emscripten"))]
+#[cfg(any(target_os = "ios", target_os = "android", target_arch = "wasm32"))]
 fn main() {
    println!("This platform doesn't support run_return.");
 }
--- a/src/dpi.rs
+++ b/src/dpi.rs
@@ -28,18 +28,18 @@
 //! them entering an existential panic. Once users enter that state, they will no longer be focused on your application.
 //!
 //! There are two ways to get the DPI factor:
-//! - You can track the [`HiDpiFactorChanged`](../enum.WindowEvent.html#variant.HiDpiFactorChanged) event of your
+//! - You can track the [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged) event of your
 //!   windows. This event is sent any time the DPI factor changes, either because the window moved to another monitor,
 //!   or because the user changed the configuration of their screen.
 //! - You can also retrieve the DPI factor of a monitor by calling
-//!   [`MonitorHandle::hidpi_factor`](../monitor/struct.MonitorHandle.html#method.hidpi_factor), or the
+//!   [`MonitorHandle::hidpi_factor`](crate::monitor::MonitorHandle::hidpi_factor), or the
 //!   current DPI factor applied to a window by calling
-//!   [`Window::hidpi_factor`](../window/struct.Window.html#method.hidpi_factor), which is roughly equivalent
+//!   [`Window::hidpi_factor`](crate::window::Window::hidpi_factor), which is roughly equivalent
 //!   to `window.current_monitor().hidpi_factor()`.
 //!
 //! Depending on the platform, the window's actual DPI factor may only be known after
 //! the event loop has started and your window has been drawn once. To properly handle these cases,
-//! the most robust way is to monitor the [`HiDpiFactorChanged`](../enum.WindowEvent.html#variant.HiDpiFactorChanged)
+//! the most robust way is to monitor the [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged)
 //! event and dynamically adapt your drawing logic to follow the DPI factor.
 //!
 //! Here's an overview of what sort of DPI factors you can expect, and where they come from:
@@ -49,30 +49,31 @@
 //! - **macOS:** The buzzword is "retina displays", which have a DPI factor of 2.0. Otherwise, the DPI factor is 1.0.
 //! Intermediate DPI factors are never used, thus 1440p displays/etc. aren't properly supported. It's possible for any
 //! display to use that 2.0 DPI factor, given the use of the command line.
-//! - **X11:** On X11, we calcuate the DPI factor based on the millimeter dimensions provided by XRandR. This can
+//! - **X11:** On X11, we calculate the DPI factor based on the millimeter dimensions provided by XRandR. This can
 //! result in a wide range of possible values, including some interesting ones like 1.0833333333333333. This can be
 //! overridden using the `WINIT_HIDPI_FACTOR` environment variable, though that's not recommended.
 //! - **Wayland:** On Wayland, DPI factors are set per-screen by the server, and are always integers (most often 1 or 2).
 //! - **iOS:** DPI factors are both constant and device-specific on iOS.
 //! - **Android:** This feature isn't yet implemented on Android, so the DPI factor will always be returned as 1.0.
+//! - **Web:** DPI factors are handled by the browser and will always be 1.0 for your application.
 //!
 //! The window's logical size is conserved across DPI changes, resulting in the physical size changing instead. This
 //! may be surprising on X11, but is quite standard elsewhere. Physical size changes always produce a
-//! [`Resized`](../event/enum.WindowEvent.html#variant.Resized) event, even on platforms where no resize actually occurs,
+//! [`Resized`](crate::event::WindowEvent::Resized) event, even on platforms where no resize actually occurs,
 //! such as macOS and Wayland. As a result, it's not necessary to separately handle
-//! [`HiDpiFactorChanged`](../event/enum.WindowEvent.html#variant.HiDpiFactorChanged) if you're only listening for size.
+//! [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged) if you're only listening for size.
 //!
 //! Your GPU has no awareness of the concept of logical pixels, and unless you like wasting pixel density, your
 //! framebuffer's size should be in physical pixels.
 //!
-//! `winit` will send [`Resized`](../enum.WindowEvent.html#variant.Resized) events whenever a window's logical size
-//! changes, and [`HiDpiFactorChanged`](../enum.WindowEvent.html#variant.HiDpiFactorChanged) events
+//! `winit` will send [`Resized`](crate::event::WindowEvent::Resized) events whenever a window's logical size
+//! changes, and [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged) events
 //! whenever the DPI factor changes. Receiving either of these events means that the physical size of your window has
 //! changed, and you should recompute it using the latest values you received for each. If the logical size and the
 //! DPI factor change simultaneously, `winit` will send both events together; thus, it's recommended to buffer
 //! these events and process them at the end of the queue.
 //!
-//! If you never received any [`HiDpiFactorChanged`](../enum.WindowEvent.html#variant.HiDpiFactorChanged) events,
+//! If you never received any [`HiDpiFactorChanged`](crate::event::WindowEvent::HiDpiFactorChanged) events,
 //! then your window's DPI factor is 1.

 /// Checks that the DPI factor is a normal positive `f64`.
--- a/src/event.rs
+++ b/src/event.rs
@@ -3,8 +3,9 @@
 //! These are sent to the closure given to [`EventLoop::run(...)`][event_loop_run], where they get
 //! processed and used to modify the program state. For more details, see the root-level documentation.
 //!
-//! [event_loop_run]: ../event_loop/struct.EventLoop.html#method.run
-use std::{path::PathBuf, time::Instant};
+//! [event_loop_run]: crate::event_loop::EventLoop::run
+use instant::Instant;
+use std::path::PathBuf;

 use crate::{
    dpi::{LogicalPosition, LogicalSize},
@@ -25,7 +26,7 @@ pub enum Event<T> {
        device_id: DeviceId,
        event: DeviceEvent,
    },
-    /// Emitted when an event is sent from [`EventLoopProxy::send_event`](../event_loop/struct.EventLoopProxy.html#method.send_event)
+    /// Emitted when an event is sent from [`EventLoopProxy::send_event`](crate::event_loop::EventLoopProxy::send_event)
    UserEvent(T),
    /// Emitted when new events arrive from the OS to be processed.
    NewEvents(StartCause),
@@ -61,7 +62,7 @@ impl<T> Event<T> {
 }

 /// Describes the reason the event loop is resuming.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum StartCause {
    /// Sent if the time specified by `ControlFlow::WaitUntil` has been reached. Contains the
    /// moment the timeout was requested and the requested resume time. The actual resume time is
@@ -131,6 +132,15 @@ pub enum WindowEvent {
    KeyboardInput {
        device_id: DeviceId,
        input: KeyboardInput,
+        /// If `true`, the event was generated synthetically by winit
+        /// in one of the following circumstances:
+        ///
+        /// * **X11**: Synthetic key press events are generated for all keys pressed
+        ///   when a window gains focus. Likewise, synthetic key release events
+        ///   are generated for all keys pressed when a window goes out of focus.
+        ///
+        /// Otherwise, this value is always `false`.
+        is_synthetic: bool,
    },

    /// The cursor has moved on the window.
@@ -198,7 +208,7 @@ pub enum WindowEvent {
    /// * Changing the display's DPI factor (e.g. in Control Panel on Windows).
    /// * Moving the window to a display with a different DPI factor.
    ///
-    /// For more information about DPI in general, see the [`dpi`](../dpi/index.html) module.
+    /// For more information about DPI in general, see the [`dpi`](crate::dpi) module.
    HiDpiFactorChanged(f64),
 }

@@ -261,7 +271,15 @@ pub enum DeviceEvent {
        button: ButtonId,
        state: ElementState,
    },
+
    Key(KeyboardInput),
+
+    /// Keyboard modifiers have changed
+    #[doc(hidden)]
+    ModifiersChanged {
+        modifiers: ModifiersState,
+    },
+
    Text {
        codepoint: char,
    },
@@ -329,7 +347,7 @@ pub struct Touch {
    ///
    /// ## Platform-specific
    ///
-    /// - Only available on **iOS**.
+    /// - Only available on **iOS** 9.0+ and **Windows** 8+.
    pub force: Option<Force>,
    /// Unique identifier of a finger.
    pub id: u64,
--- a/src/event_loop.rs
+++ b/src/event_loop.rs
@@ -6,16 +6,14 @@
 //! See the root-level documentation for information on how to create and use an event loop to
 //! handle events.
 //!
-//! [create_proxy]: ./struct.EventLoop.html#method.create_proxy
-//! [event_loop_proxy]: ./struct.EventLoopProxy.html
-//! [send_event]: ./struct.EventLoopProxy.html#method.send_event
-use std::{error, fmt, ops::Deref, time::Instant};
+//! [create_proxy]: crate::event_loop::EventLoop::create_proxy
+//! [event_loop_proxy]: crate::event_loop::EventLoopProxy
+//! [send_event]: crate::event_loop::EventLoopProxy::send_event
+use instant::Instant;
+use std::ops::Deref;
+use std::{error, fmt};

-use crate::{
-    event::Event,
-    monitor::{AvailableMonitorsIter, MonitorHandle},
-    platform_impl,
-};
+use crate::{event::Event, monitor::MonitorHandle, platform_impl};

 /// Provides a way to retrieve events from the system and from the windows that were registered to
 /// the events loop.
@@ -30,6 +28,7 @@ use crate::{
 /// forbidding it), as such it is neither `Send` nor `Sync`. If you need cross-thread access, the
 /// `Window` created from this `EventLoop` _can_ be sent to an other thread, and the
 /// `EventLoopProxy` allows you to wake up an `EventLoop` from another thread.
+///
 pub struct EventLoop<T: 'static> {
    pub(crate) event_loop: platform_impl::EventLoop<T>,
    pub(crate) _marker: ::std::marker::PhantomData<*mut ()>, // Not Send nor Sync
@@ -69,8 +68,8 @@ impl<T> fmt::Debug for EventLoopWindowTarget<T> {
 /// are **not** persistent between multiple calls to `run_return` - issuing a new call will reset
 /// the control flow to `Poll`.
 ///
-/// [events_cleared]: ../event/enum.Event.html#variant.EventsCleared
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+/// [events_cleared]: crate::event::Event::EventsCleared
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub enum ControlFlow {
    /// When the current loop iteration finishes, immediately begin a new iteration regardless of
    /// whether or not new events are available to process.
@@ -96,6 +95,18 @@ impl Default for ControlFlow {
 impl EventLoop<()> {
    /// Builds a new event loop with a `()` as the user event type.
    ///
+    /// ***For cross-platform compatibility, the `EventLoop` must be created on the main thread.***
+    /// Attempting to create the event loop on a different thread will panic. This restriction isn't
+    /// strictly necessary on all platforms, but is imposed to eliminate any nasty surprises when
+    /// porting to platforms that require it. `EventLoopExt::new_any_thread` functions are exposed
+    /// in the relevant `platform` module if the target platform supports creating an event loop on
+    /// any thread.
+    ///
+    /// Usage will result in display backend initialisation, this can be controlled on linux
+    /// using an environment variable `WINIT_UNIX_BACKEND`. Legal values are `x11` and `wayland`.
+    /// If it is not set, winit will try to connect to a wayland connection, and if it fails will
+    /// fallback on x11. If this variable is set with any other value, winit will panic.
+    ///
    /// ## Platform-specific
    ///
    /// - **iOS:** Can only be called on the main thread.
@@ -107,10 +118,7 @@ impl EventLoop<()> {
 impl<T> EventLoop<T> {
    /// Builds a new event loop.
    ///
-    /// Usage will result in display backend initialisation, this can be controlled on linux
-    /// using an environment variable `WINIT_UNIX_BACKEND`. Legal values are `x11` and `wayland`.
-    /// If it is not set, winit will try to connect to a wayland connection, and if it fails will
-    /// fallback on x11. If this variable is set with any other value, winit will panic.
+    /// All caveats documented in [`EventLoop::new`] apply to this function.
    ///
    /// ## Platform-specific
    ///
@@ -131,7 +139,7 @@ impl<T> EventLoop<T> {
    ///
    /// Any values not passed to this function will *not* be dropped.
    ///
-    /// [`ControlFlow`]: ./enum.ControlFlow.html
+    /// [`ControlFlow`]: crate::event_loop::ControlFlow
    #[inline]
    pub fn run<F>(self, event_handler: F) -> !
    where
@@ -150,10 +158,10 @@ impl<T> EventLoop<T> {
    /// Returns the list of all the monitors available on the system.
    #[inline]
    pub fn available_monitors(&self) -> impl Iterator<Item = MonitorHandle> {
-        let data = self.event_loop.available_monitors();
-        AvailableMonitorsIter {
-            data: data.into_iter(),
-        }
+        self.event_loop
+            .available_monitors()
+            .into_iter()
+            .map(|inner| MonitorHandle { inner })
    }

    /// Returns the primary monitor of the system.
@@ -191,7 +199,7 @@ impl<T: 'static> EventLoopProxy<T> {
    /// function.
    ///
    /// Returns an `Err` if the associated `EventLoop` no longer exists.
-    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed> {
+    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
        self.event_loop_proxy.send_event(event)
    }
 }
@@ -203,17 +211,17 @@ impl<T: 'static> fmt::Debug for EventLoopProxy<T> {
 }

 /// The error that is returned when an `EventLoopProxy` attempts to wake up an `EventLoop` that
-/// no longer exists.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub struct EventLoopClosed;
+/// no longer exists. Contains the original event given to `send_event`.
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+pub struct EventLoopClosed<T>(pub T);

-impl fmt::Display for EventLoopClosed {
+impl<T: fmt::Debug> fmt::Display for EventLoopClosed<T> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", error::Error::description(self))
    }
 }

-impl error::Error for EventLoopClosed {
+impl<T: fmt::Debug> error::Error for EventLoopClosed<T> {
    fn description(&self) -> &str {
        "Tried to wake up a closed `EventLoop`"
    }
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -50,7 +50,7 @@
 //!     match event {
 //!         Event::EventsCleared => {
 //!             // Application update code.
-//!     
+//!
 //!             // Queue a RedrawRequested event.
 //!             window.request_redraw();
 //!         },
@@ -92,25 +92,26 @@
 //! retrieve the raw handle of the window (see the [`platform`] module), which in turn allows you
 //! to create an OpenGL/Vulkan/DirectX/Metal/etc. context that will draw on the [`Window`].
 //!
-//! [`EventLoop`]: ./event_loop/struct.EventLoop.html
-//! [`EventLoop::new()`]: ./event_loop/struct.EventLoop.html#method.new
-//! [event_loop_run]: ./event_loop/struct.EventLoop.html#method.run
-//! [`ControlFlow`]: ./event_loop/enum.ControlFlow.html
-//! [`Exit`]: ./event_loop/enum.ControlFlow.html#variant.Exit
-//! [`Window`]: ./window/struct.Window.html
-//! [`WindowBuilder`]: ./window/struct.WindowBuilder.html
-//! [window_new]: ./window/struct.Window.html#method.new
-//! [window_builder_new]: ./window/struct.WindowBuilder.html#method.new
-//! [window_builder_build]: ./window/struct.WindowBuilder.html#method.build
-//! [window_id_fn]: ./window/struct.Window.html#method.id
-//! [`Event`]: ./event/enum.Event.html
-//! [`WindowEvent`]: ./event/enum.WindowEvent.html
-//! [`DeviceEvent`]: ./event/enum.DeviceEvent.html
-//! [`UserEvent`]: ./event/enum.Event.html#variant.UserEvent
-//! [`LoopDestroyed`]: ./event/enum.Event.html#variant.LoopDestroyed
-//! [`platform`]: ./platform/index.html
+//! [`EventLoop`]: event_loop::EventLoop
+//! [`EventLoop::new()`]: event_loop::EventLoop::new
+//! [event_loop_run]: event_loop::EventLoop::run
+//! [`ControlFlow`]: event_loop::ControlFlow
+//! [`Exit`]: event_loop::ControlFlow::Exit
+//! [`Window`]: window::Window
+//! [`WindowBuilder`]: window::WindowBuilder
+//! [window_new]: window::Window::new
+//! [window_builder_new]: window::WindowBuilder::new
+//! [window_builder_build]: window::WindowBuilder::build
+//! [window_id_fn]: window::Window::id
+//! [`Event`]: event::Event
+//! [`WindowEvent`]: event::WindowEvent
+//! [`DeviceEvent`]: event::DeviceEvent
+//! [`UserEvent`]: event::Event::UserEvent
+//! [`LoopDestroyed`]: event::Event::LoopDestroyed
+//! [`platform`]: platform

 #![deny(rust_2018_idioms)]
+#![deny(intra_doc_link_resolution_failure)]

 #[allow(unused_imports)]
 #[macro_use]
@@ -121,13 +122,13 @@ extern crate log;
 #[macro_use]
 extern crate serde;
 #[macro_use]
-extern crate derivative;
-#[macro_use]
 #[cfg(any(target_os = "ios", target_os = "windows"))]
 extern crate bitflags;
 #[cfg(any(target_os = "macos", target_os = "ios"))]
 #[macro_use]
 extern crate objc;
+#[cfg(all(target_arch = "wasm32", feature = "std_web"))]
+extern crate std_web as stdweb;

 pub mod dpi;
 #[macro_use]
--- a/src/monitor.rs
+++ b/src/monitor.rs
@@ -1,63 +1,36 @@
 //! Types useful for interacting with a user's monitors.
 //!
-//! If you want to get basic information about a monitor, you can use the [`MonitorHandle`][monitor_id]
-//! type. This is retreived from an [`AvailableMonitorsIter`][monitor_iter], which can be acquired
-//! with:
+//! If you want to get basic information about a monitor, you can use the [`MonitorHandle`][monitor_handle]
+//! type. This is retreived from one of the following methods, which return an iterator of
+//! [`MonitorHandle`][monitor_handle]:
 //! - [`EventLoop::available_monitors`][loop_get]
 //! - [`Window::available_monitors`][window_get].
 //!
-//! [monitor_id]: ./struct.MonitorHandle.html
-//! [monitor_iter]: ./struct.AvailableMonitorsIter.html
-//! [loop_get]: ../event_loop/struct.EventLoop.html#method.available_monitors
-//! [window_get]: ../window/struct.Window.html#method.available_monitors
-use std::collections::vec_deque::IntoIter as VecDequeIter;
-
+//! [monitor_handle]: crate::monitor::MonitorHandle
+//! [loop_get]: crate::event_loop::EventLoop::available_monitors
+//! [window_get]: crate::window::Window::available_monitors
 use crate::{
    dpi::{PhysicalPosition, PhysicalSize},
    platform_impl,
 };

-/// An iterator over all available monitors.
-///
-/// Can be acquired with:
-/// - [`EventLoop::available_monitors`][loop_get]
-/// - [`Window::available_monitors`][window_get].
-///
-/// [loop_get]: ../event_loop/struct.EventLoop.html#method.available_monitors
-/// [window_get]: ../window/struct.Window.html#method.available_monitors
-// Implementation note: we retrieve the list once, then serve each element by one by one.
-// This may change in the future.
-#[derive(Debug)]
-pub struct AvailableMonitorsIter {
-    pub(crate) data: VecDequeIter<platform_impl::MonitorHandle>,
-}
-
-impl Iterator for AvailableMonitorsIter {
-    type Item = MonitorHandle;
-
-    #[inline]
-    fn next(&mut self) -> Option<MonitorHandle> {
-        self.data.next().map(|id| MonitorHandle { inner: id })
-    }
-
-    #[inline]
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        self.data.size_hint()
-    }
-}
-
 /// Describes a fullscreen video mode of a monitor.
 ///
 /// Can be acquired with:
 /// - [`MonitorHandle::video_modes`][monitor_get].
 ///
-/// [monitor_get]: ../monitor/struct.MonitorHandle.html#method.video_modes
-#[derive(Derivative)]
-#[derivative(Clone, Debug = "transparent", PartialEq, Eq, Hash)]
+/// [monitor_get]: crate::monitor::MonitorHandle::video_modes
+#[derive(Clone, PartialEq, Eq, Hash)]
 pub struct VideoMode {
    pub(crate) video_mode: platform_impl::VideoMode,
 }

+impl std::fmt::Debug for VideoMode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.video_mode.fmt(f)
+    }
+}
+
 impl PartialOrd for VideoMode {
    fn partial_cmp(&self, other: &VideoMode) -> Option<std::cmp::Ordering> {
        Some(self.cmp(other))
@@ -135,7 +108,7 @@ impl std::fmt::Display for VideoMode {
 ///
 /// Allows you to retrieve information about a given monitor and can be used in [`Window`] creation.
 ///
-/// [`Window`]: ../window/struct.Window.html
+/// [`Window`]: crate::window::Window
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct MonitorHandle {
    pub(crate) inner: platform_impl::MonitorHandle,
@@ -145,12 +118,20 @@ impl MonitorHandle {
    /// Returns a human-readable name of the monitor.
    ///
    /// Returns `None` if the monitor doesn't exist anymore.
+    ///
+    /// ## Platform-specific
+    ///
+    /// - **Web:** Always returns None
    #[inline]
    pub fn name(&self) -> Option<String> {
        self.inner.name()
    }

    /// Returns the monitor's resolution.
+    ///
+    /// ## Platform-specific
+    ///
+    /// - **Web:** Always returns (0,0)
    #[inline]
    pub fn size(&self) -> PhysicalSize {
        self.inner.size()
@@ -158,6 +139,10 @@ impl MonitorHandle {

    /// Returns the top-left corner position of the monitor relative to the larger full
    /// screen area.
+    ///
+    /// ## Platform-specific
+    ///
+    /// - **Web:** Always returns (0,0)
    #[inline]
    pub fn position(&self) -> PhysicalPosition {
        self.inner.position()
@@ -165,18 +150,23 @@ impl MonitorHandle {

    /// Returns the DPI factor that can be used to map logical pixels to physical pixels, and vice versa.
    ///
-    /// See the [`dpi`](../dpi/index.html) module for more information.
+    /// See the [`dpi`](crate::dpi) module for more information.
    ///
    /// ## Platform-specific
    ///
    /// - **X11:** Can be overridden using the `WINIT_HIDPI_FACTOR` environment variable.
    /// - **Android:** Always returns 1.0.
+    /// - **Web:** Always returns 1.0
    #[inline]
    pub fn hidpi_factor(&self) -> f64 {
        self.inner.hidpi_factor()
    }

    /// Returns all fullscreen video modes supported by this monitor.
+    ///
+    /// ## Platform-specific
+    ///
+    /// - **Web:** Always returns an empty iterator
    #[inline]
    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
        self.inner.video_modes()
--- a/src/platform/ios.rs
+++ b/src/platform/ios.rs
@@ -70,6 +70,8 @@ pub trait WindowExtIOS {
    /// [`-[UIViewController prefersHomeIndicatorAutoHidden]`](https://developer.apple.com/documentation/uikit/uiviewcontroller/2887510-prefershomeindicatorautohidden?language=objc),
    /// and then calls
    /// [`-[UIViewController setNeedsUpdateOfHomeIndicatorAutoHidden]`](https://developer.apple.com/documentation/uikit/uiviewcontroller/2887509-setneedsupdateofhomeindicatoraut?language=objc).
+    ///
+    /// This only has an effect on iOS 11.0+.
    fn set_prefers_home_indicator_hidden(&self, hidden: bool);

    /// Sets the screen edges for which the system gestures will take a lower priority than the
@@ -79,6 +81,8 @@ pub trait WindowExtIOS {
    /// [`-[UIViewController preferredScreenEdgesDeferringSystemGestures]`](https://developer.apple.com/documentation/uikit/uiviewcontroller/2887512-preferredscreenedgesdeferringsys?language=objc),
    /// and then calls
    /// [`-[UIViewController setNeedsUpdateOfScreenEdgesDeferringSystemGestures]`](https://developer.apple.com/documentation/uikit/uiviewcontroller/2887507-setneedsupdateofscreenedgesdefer?language=objc).
+    ///
+    /// This only has an effect on iOS 11.0+.
    fn set_preferred_screen_edges_deferring_system_gestures(&self, edges: ScreenEdge);

    /// Sets whether the [`Window`] prefers the status bar hidden.
@@ -167,6 +171,8 @@ pub trait WindowBuilderExtIOS {
    ///
    /// This sets the initial value returned by
    /// [`-[UIViewController prefersHomeIndicatorAutoHidden]`](https://developer.apple.com/documentation/uikit/uiviewcontroller/2887510-prefershomeindicatorautohidden?language=objc).
+    ///
+    /// This only has an effect on iOS 11.0+.
    fn with_prefers_home_indicator_hidden(self, hidden: bool) -> WindowBuilder;

    /// Sets the screen edges for which the system gestures will take a lower priority than the
@@ -174,6 +180,8 @@ pub trait WindowBuilderExtIOS {
    ///
    /// This sets the initial value returned by
    /// [`-[UIViewController preferredScreenEdgesDeferringSystemGestures]`](https://developer.apple.com/documentation/uikit/uiviewcontroller/2887512-preferredscreenedgesdeferringsys?language=objc).
+    ///
+    /// This only has an effect on iOS 11.0+.
    fn with_preferred_screen_edges_deferring_system_gestures(
        self,
        edges: ScreenEdge,
--- a/src/platform/mod.rs
+++ b/src/platform/mod.rs
@@ -7,6 +7,7 @@
 //!  - `macos`
 //!  - `unix`
 //!  - `windows`
+//!  - `web`
 //!
 //! And the following platform-specific module:
 //!
@@ -21,3 +22,4 @@ pub mod unix;
 pub mod windows;

 pub mod desktop;
+pub mod web;
--- a/src/platform/unix.rs
+++ b/src/platform/unix.rs
@@ -144,35 +144,90 @@ impl<T> EventLoopWindowTargetExtUnix for EventLoopWindowTarget<T> {

 /// Additional methods on `EventLoop` that are specific to Unix.
 pub trait EventLoopExtUnix {
-    /// Builds a new `EventLoops` that is forced to use X11.
+    /// Builds a new `EventLoop` that is forced to use X11.
+    ///
+    /// # Panics
+    ///
+    /// If called outside the main thread. To initialize an X11 event loop outside
+    /// the main thread, use [`new_x11_any_thread`](#tymethod.new_x11_any_thread).
    fn new_x11() -> Result<Self, XNotSupported>
    where
        Self: Sized;

    /// Builds a new `EventLoop` that is forced to use Wayland.
+    ///
+    /// # Panics
+    ///
+    /// If called outside the main thread. To initialize a Wayland event loop outside
+    /// the main thread, use [`new_wayland_any_thread`](#tymethod.new_wayland_any_thread).
    fn new_wayland() -> Self
    where
        Self: Sized;
+
+    /// Builds a new `EventLoop` on any thread.
+    ///
+    /// This method bypasses the cross-platform compatibility requirement
+    /// that `EventLoop` be created on the main thread.
+    fn new_any_thread() -> Self
+    where
+        Self: Sized;
+
+    /// Builds a new X11 `EventLoop` on any thread.
+    ///
+    /// This method bypasses the cross-platform compatibility requirement
+    /// that `EventLoop` be created on the main thread.
+    fn new_x11_any_thread() -> Result<Self, XNotSupported>
+    where
+        Self: Sized;
+
+    /// Builds a new Wayland `EventLoop` on any thread.
+    ///
+    /// This method bypasses the cross-platform compatibility requirement
+    /// that `EventLoop` be created on the main thread.
+    fn new_wayland_any_thread() -> Self
+    where
+        Self: Sized;
+}
+
+fn wrap_ev<T>(event_loop: LinuxEventLoop<T>) -> EventLoop<T> {
+    EventLoop {
+        event_loop,
+        _marker: std::marker::PhantomData,
+    }
 }

 impl<T> EventLoopExtUnix for EventLoop<T> {
+    #[inline]
+    fn new_any_thread() -> Self {
+        wrap_ev(LinuxEventLoop::new_any_thread())
+    }
+
+    #[inline]
+    fn new_x11_any_thread() -> Result<Self, XNotSupported> {
+        LinuxEventLoop::new_x11_any_thread().map(wrap_ev)
+    }
+
+    #[inline]
+    fn new_wayland_any_thread() -> Self {
+        wrap_ev(
+            LinuxEventLoop::new_wayland_any_thread()
+                // TODO: propagate
+                .expect("failed to open Wayland connection"),
+        )
+    }
+
    #[inline]
    fn new_x11() -> Result<Self, XNotSupported> {
-        LinuxEventLoop::new_x11().map(|ev| EventLoop {
-            event_loop: ev,
-            _marker: ::std::marker::PhantomData,
-        })
+        LinuxEventLoop::new_x11().map(wrap_ev)
    }

    #[inline]
    fn new_wayland() -> Self {
-        EventLoop {
-            event_loop: match LinuxEventLoop::new_wayland() {
-                Ok(e) => e,
-                Err(_) => panic!(), // TODO: propagate
-            },
-            _marker: ::std::marker::PhantomData,
-        }
+        wrap_ev(
+            LinuxEventLoop::new_wayland()
+                // TODO: propagate
+                .expect("failed to open Wayland connection"),
+        )
    }
 }

@@ -267,17 +322,17 @@ impl WindowExtUnix for Window {
    }

    #[inline]
-    fn xcb_connection(&self) -> Option<*mut raw::c_void> {
-        match self.window {
-            LinuxWindow::X(ref w) => Some(w.xcb_connection()),
-            _ => None,
+    fn set_urgent(&self, is_urgent: bool) {
+        if let LinuxWindow::X(ref w) = self.window {
+            w.set_urgent(is_urgent);
        }
    }

    #[inline]
-    fn set_urgent(&self, is_urgent: bool) {
-        if let LinuxWindow::X(ref w) = self.window {
-            w.set_urgent(is_urgent);
+    fn xcb_connection(&self) -> Option<*mut raw::c_void> {
+        match self.window {
+            LinuxWindow::X(ref w) => Some(w.xcb_connection()),
+            _ => None,
        }
    }

@@ -313,82 +368,82 @@ impl WindowExtUnix for Window {

 /// Additional methods on `WindowBuilder` that are specific to Unix.
 pub trait WindowBuilderExtUnix {
-    fn with_x11_visual<T>(self, visual_infos: *const T) -> WindowBuilder;
-    fn with_x11_screen(self, screen_id: i32) -> WindowBuilder;
+    fn with_x11_visual<T>(self, visual_infos: *const T) -> Self;
+    fn with_x11_screen(self, screen_id: i32) -> Self;

    /// Build window with `WM_CLASS` hint; defaults to the name of the binary. Only relevant on X11.
-    fn with_class(self, class: String, instance: String) -> WindowBuilder;
+    fn with_class(self, class: String, instance: String) -> Self;
    /// Build window with override-redirect flag; defaults to false. Only relevant on X11.
-    fn with_override_redirect(self, override_redirect: bool) -> WindowBuilder;
-    /// Build window with `_NET_WM_WINDOW_TYPE` hint; defaults to `Normal`. Only relevant on X11.
-    fn with_x11_window_type(self, x11_window_type: XWindowType) -> WindowBuilder;
+    fn with_override_redirect(self, override_redirect: bool) -> Self;
+    /// Build window with `_NET_WM_WINDOW_TYPE` hints; defaults to `Normal`. Only relevant on X11.
+    fn with_x11_window_type(self, x11_window_type: Vec<XWindowType>) -> Self;
    /// Build window with `_GTK_THEME_VARIANT` hint set to the specified value. Currently only relevant on X11.
-    fn with_gtk_theme_variant(self, variant: String) -> WindowBuilder;
+    fn with_gtk_theme_variant(self, variant: String) -> Self;
    /// Build window with resize increment hint. Only implemented on X11.
-    fn with_resize_increments(self, increments: LogicalSize) -> WindowBuilder;
+    fn with_resize_increments(self, increments: LogicalSize) -> Self;
    /// Build window with base size hint. Only implemented on X11.
-    fn with_base_size(self, base_size: LogicalSize) -> WindowBuilder;
+    fn with_base_size(self, base_size: LogicalSize) -> Self;

    /// Build window with a given application ID. It should match the `.desktop` file distributed with
    /// your program. Only relevant on Wayland.
    ///
    /// For details about application ID conventions, see the
    /// [Desktop Entry Spec](https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#desktop-file-id)
-    fn with_app_id(self, app_id: String) -> WindowBuilder;
+    fn with_app_id(self, app_id: String) -> Self;
 }

 impl WindowBuilderExtUnix for WindowBuilder {
    #[inline]
-    fn with_x11_visual<T>(mut self, visual_infos: *const T) -> WindowBuilder {
+    fn with_x11_visual<T>(mut self, visual_infos: *const T) -> Self {
        self.platform_specific.visual_infos =
            Some(unsafe { ptr::read(visual_infos as *const XVisualInfo) });
        self
    }

    #[inline]
-    fn with_x11_screen(mut self, screen_id: i32) -> WindowBuilder {
+    fn with_x11_screen(mut self, screen_id: i32) -> Self {
        self.platform_specific.screen_id = Some(screen_id);
        self
    }

    #[inline]
-    fn with_class(mut self, instance: String, class: String) -> WindowBuilder {
+    fn with_class(mut self, instance: String, class: String) -> Self {
        self.platform_specific.class = Some((instance, class));
        self
    }

    #[inline]
-    fn with_override_redirect(mut self, override_redirect: bool) -> WindowBuilder {
+    fn with_override_redirect(mut self, override_redirect: bool) -> Self {
        self.platform_specific.override_redirect = override_redirect;
        self
    }

    #[inline]
-    fn with_x11_window_type(mut self, x11_window_type: XWindowType) -> WindowBuilder {
-        self.platform_specific.x11_window_type = x11_window_type;
+    fn with_x11_window_type(mut self, x11_window_types: Vec<XWindowType>) -> Self {
+        self.platform_specific.x11_window_types = x11_window_types;
        self
    }

    #[inline]
-    fn with_resize_increments(mut self, increments: LogicalSize) -> WindowBuilder {
-        self.platform_specific.resize_increments = Some(increments.into());
-        self
-    }
-
-    #[inline]
-    fn with_base_size(mut self, base_size: LogicalSize) -> WindowBuilder {
-        self.platform_specific.base_size = Some(base_size.into());
-        self
-    }
-
-    #[inline]
-    fn with_gtk_theme_variant(mut self, variant: String) -> WindowBuilder {
+    fn with_gtk_theme_variant(mut self, variant: String) -> Self {
        self.platform_specific.gtk_theme_variant = Some(variant);
        self
    }

    #[inline]
-    fn with_app_id(mut self, app_id: String) -> WindowBuilder {
+    fn with_resize_increments(mut self, increments: LogicalSize) -> Self {
+        self.platform_specific.resize_increments = Some(increments.into());
+        self
+    }
+
+    #[inline]
+    fn with_base_size(mut self, base_size: LogicalSize) -> Self {
+        self.platform_specific.base_size = Some(base_size.into());
+        self
+    }
+
+    #[inline]
+    fn with_app_id(mut self, app_id: String) -> Self {
        self.platform_specific.app_id = Some(app_id);
        self
    }
--- a/src/platform/web.rs
+++ b/src/platform/web.rs
@@ -0,0 +1,22 @@
+#![cfg(target_arch = "wasm32")]
+
+//! The web target does not automatically insert the canvas element object into the web page, to
+//! allow end users to determine how the page should be laid out. Use the `WindowExtStdweb` or
+//! `WindowExtWebSys` traits (depending on your web backend) to retrieve the canvas from the
+//! Window.
+
+#[cfg(feature = "stdweb")]
+use stdweb::web::html_element::CanvasElement;
+
+#[cfg(feature = "stdweb")]
+pub trait WindowExtStdweb {
+    fn canvas(&self) -> CanvasElement;
+}
+
+#[cfg(feature = "web-sys")]
+use web_sys::HtmlCanvasElement;
+
+#[cfg(feature = "web-sys")]
+pub trait WindowExtWebSys {
+    fn canvas(&self) -> HtmlCanvasElement;
+}
--- a/src/platform/windows.rs
+++ b/src/platform/windows.rs
@@ -15,18 +15,52 @@ use crate::{

 /// Additional methods on `EventLoop` that are specific to Windows.
 pub trait EventLoopExtWindows {
+    /// Creates an event loop off of the main thread.
+    ///
+    /// # `Window` caveats
+    ///
+    /// Note that any `Window` created on the new thread will be destroyed when the thread
+    /// terminates. Attempting to use a `Window` after its parent thread terminates has
+    /// unspecified, although explicitly not undefined, behavior.
+    fn new_any_thread() -> Self
+    where
+        Self: Sized;
+
    /// By default, winit on Windows will attempt to enable process-wide DPI awareness. If that's
    /// undesirable, you can create an `EventLoop` using this function instead.
    fn new_dpi_unaware() -> Self
    where
        Self: Sized;
+
+    /// Creates a DPI-unaware event loop off of the main thread.
+    ///
+    /// The `Window` caveats in [`new_any_thread`](EventLoopExtWindows::new_any_thread) also apply here.
+    fn new_dpi_unaware_any_thread() -> Self
+    where
+        Self: Sized;
 }

 impl<T> EventLoopExtWindows for EventLoop<T> {
+    #[inline]
+    fn new_any_thread() -> Self {
+        EventLoop {
+            event_loop: WindowsEventLoop::new_any_thread(),
+            _marker: ::std::marker::PhantomData,
+        }
+    }
+
    #[inline]
    fn new_dpi_unaware() -> Self {
        EventLoop {
-            event_loop: WindowsEventLoop::with_dpi_awareness(false),
+            event_loop: WindowsEventLoop::new_dpi_unaware(),
+            _marker: ::std::marker::PhantomData,
+        }
+    }
+
+    #[inline]
+    fn new_dpi_unaware_any_thread() -> Self {
+        EventLoop {
+            event_loop: WindowsEventLoop::new_dpi_unaware_any_thread(),
            _marker: ::std::marker::PhantomData,
        }
    }
@@ -34,6 +68,8 @@ impl<T> EventLoopExtWindows for EventLoop<T> {

 /// Additional methods on `Window` that are specific to Windows.
 pub trait WindowExtWindows {
+    /// Returns the HINSTANCE of the window
+    fn hinstance(&self) -> *mut libc::c_void;
    /// Returns the native handle that is used by this window.
    ///
    /// The pointer will become invalid when the native window was destroyed.
@@ -44,6 +80,11 @@ pub trait WindowExtWindows {
 }

 impl WindowExtWindows for Window {
+    #[inline]
+    fn hinstance(&self) -> *mut libc::c_void {
+        self.window.hinstance() as *mut _
+    }
+
    #[inline]
    fn hwnd(&self) -> *mut libc::c_void {
        self.window.hwnd() as *mut _
--- a/src/platform_impl/android/mod.rs
+++ b/src/platform_impl/android/mod.rs
@@ -19,6 +19,7 @@ use crate::{
    CreationError, CursorIcon, Event, LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize,
    WindowAttributes, WindowEvent, WindowId as RootWindowId,
 };
+use raw_window_handle::{android::AndroidHandle, RawWindowHandle};
 use CreationError::OsError;

 pub type OsError = std::io::Error;
@@ -156,7 +157,7 @@ impl EventLoop {
 }

 impl EventLoopProxy {
-    pub fn wakeup(&self) -> Result<(), ::EventLoopClosed> {
+    pub fn wakeup(&self) -> Result<(), ::EventLoopClosed<()>> {
        android_glue::wake_event_loop();
        Ok(())
    }
@@ -421,6 +422,15 @@ impl Window {
    pub fn id(&self) -> WindowId {
        WindowId
    }
+
+    #[inline]
+    pub fn raw_window_handle(&self) -> RawWindowHandle {
+        let handle = AndroidHandle {
+            a_native_window: self.native_window,
+            ..WindowsHandle::empty()
+        };
+        RawWindowHandle::Android(handle)
+    }
 }

 unsafe impl Send for Window {}
--- a/src/platform_impl/emscripten/ffi.rs
+++ b/src/platform_impl/emscripten/ffi.rs
@@ -1,363 +0,0 @@
-#![allow(dead_code, non_camel_case_types, non_snake_case)]
-
-#[cfg(test)]
-use std::mem;
-use std::os::raw::{c_char, c_double, c_int, c_long, c_ulong, c_ushort, c_void};
-
-pub type EM_BOOL = c_int;
-pub type EM_UTF8 = c_char;
-pub type EMSCRIPTEN_RESULT = c_int;
-
-pub const EM_TRUE: EM_BOOL = 1;
-pub const EM_FALSE: EM_BOOL = 0;
-
-// values for EMSCRIPTEN_RESULT
-pub const EMSCRIPTEN_RESULT_SUCCESS: c_int = 0;
-pub const EMSCRIPTEN_RESULT_DEFERRED: c_int = 1;
-pub const EMSCRIPTEN_RESULT_NOT_SUPPORTED: c_int = -1;
-pub const EMSCRIPTEN_RESULT_FAILED_NOT_DEFERRED: c_int = -2;
-pub const EMSCRIPTEN_RESULT_INVALID_TARGET: c_int = -3;
-pub const EMSCRIPTEN_RESULT_UNKNOWN_TARGET: c_int = -4;
-pub const EMSCRIPTEN_RESULT_INVALID_PARAM: c_int = -5;
-pub const EMSCRIPTEN_RESULT_FAILED: c_int = -6;
-pub const EMSCRIPTEN_RESULT_NO_DATA: c_int = -7;
-
-// values for EMSCRIPTEN EVENT
-pub const EMSCRIPTEN_EVENT_KEYPRESS: c_int = 1;
-pub const EMSCRIPTEN_EVENT_KEYDOWN: c_int = 2;
-pub const EMSCRIPTEN_EVENT_KEYUP: c_int = 3;
-pub const EMSCRIPTEN_EVENT_CLICK: c_int = 4;
-pub const EMSCRIPTEN_EVENT_MOUSEDOWN: c_int = 5;
-pub const EMSCRIPTEN_EVENT_MOUSEUP: c_int = 6;
-pub const EMSCRIPTEN_EVENT_DBLCLICK: c_int = 7;
-pub const EMSCRIPTEN_EVENT_MOUSEMOVE: c_int = 8;
-pub const EMSCRIPTEN_EVENT_WHEEL: c_int = 9;
-pub const EMSCRIPTEN_EVENT_RESIZE: c_int = 10;
-pub const EMSCRIPTEN_EVENT_SCROLL: c_int = 11;
-pub const EMSCRIPTEN_EVENT_BLUR: c_int = 12;
-pub const EMSCRIPTEN_EVENT_FOCUS: c_int = 13;
-pub const EMSCRIPTEN_EVENT_FOCUSIN: c_int = 14;
-pub const EMSCRIPTEN_EVENT_FOCUSOUT: c_int = 15;
-pub const EMSCRIPTEN_EVENT_DEVICEORIENTATION: c_int = 16;
-pub const EMSCRIPTEN_EVENT_DEVICEMOTION: c_int = 17;
-pub const EMSCRIPTEN_EVENT_ORIENTATIONCHANGE: c_int = 18;
-pub const EMSCRIPTEN_EVENT_FULLSCREENCHANGE: c_int = 19;
-pub const EMSCRIPTEN_EVENT_POINTERLOCKCHANGE: c_int = 20;
-pub const EMSCRIPTEN_EVENT_VISIBILITYCHANGE: c_int = 21;
-pub const EMSCRIPTEN_EVENT_TOUCHSTART: c_int = 22;
-pub const EMSCRIPTEN_EVENT_TOUCHEND: c_int = 23;
-pub const EMSCRIPTEN_EVENT_TOUCHMOVE: c_int = 24;
-pub const EMSCRIPTEN_EVENT_TOUCHCANCEL: c_int = 25;
-pub const EMSCRIPTEN_EVENT_GAMEPADCONNECTED: c_int = 26;
-pub const EMSCRIPTEN_EVENT_GAMEPADDISCONNECTED: c_int = 27;
-pub const EMSCRIPTEN_EVENT_BEFOREUNLOAD: c_int = 28;
-pub const EMSCRIPTEN_EVENT_BATTERYCHARGINGCHANGE: c_int = 29;
-pub const EMSCRIPTEN_EVENT_BATTERYLEVELCHANGE: c_int = 30;
-pub const EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST: c_int = 31;
-pub const EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED: c_int = 32;
-pub const EMSCRIPTEN_EVENT_MOUSEENTER: c_int = 33;
-pub const EMSCRIPTEN_EVENT_MOUSELEAVE: c_int = 34;
-pub const EMSCRIPTEN_EVENT_MOUSEOVER: c_int = 35;
-pub const EMSCRIPTEN_EVENT_MOUSEOUT: c_int = 36;
-pub const EMSCRIPTEN_EVENT_CANVASRESIZED: c_int = 37;
-pub const EMSCRIPTEN_EVENT_POINTERLOCKERROR: c_int = 38;
-
-pub const EM_HTML5_SHORT_STRING_LEN_BYTES: usize = 32;
-
-pub const DOM_KEY_LOCATION_STANDARD: c_ulong = 0x00;
-pub const DOM_KEY_LOCATION_LEFT: c_ulong = 0x01;
-pub const DOM_KEY_LOCATION_RIGHT: c_ulong = 0x02;
-pub const DOM_KEY_LOCATION_NUMPAD: c_ulong = 0x03;
-
-pub type em_callback_func = Option<unsafe extern "C" fn()>;
-
-pub type em_key_callback_func = Option<
-    unsafe extern "C" fn(
-        eventType: c_int,
-        keyEvent: *const EmscriptenKeyboardEvent,
-        userData: *mut c_void,
-    ) -> EM_BOOL,
->;
-
-pub type em_mouse_callback_func = Option<
-    unsafe extern "C" fn(
-        eventType: c_int,
-        mouseEvent: *const EmscriptenMouseEvent,
-        userData: *mut c_void,
-    ) -> EM_BOOL,
->;
-
-pub type em_pointerlockchange_callback_func = Option<
-    unsafe extern "C" fn(
-        eventType: c_int,
-        pointerlockChangeEvent: *const EmscriptenPointerlockChangeEvent,
-        userData: *mut c_void,
-    ) -> EM_BOOL,
->;
-
-pub type em_fullscreenchange_callback_func = Option<
-    unsafe extern "C" fn(
-        eventType: c_int,
-        fullscreenChangeEvent: *const EmscriptenFullscreenChangeEvent,
-        userData: *mut c_void,
-    ) -> EM_BOOL,
->;
-
-pub type em_touch_callback_func = Option<
-    unsafe extern "C" fn(
-        eventType: c_int,
-        touchEvent: *const EmscriptenTouchEvent,
-        userData: *mut c_void,
-    ) -> EM_BOOL,
->;
-
-#[repr(C)]
-pub struct EmscriptenFullscreenChangeEvent {
-    pub isFullscreen: c_int,
-    pub fullscreenEnabled: c_int,
-    pub nodeName: [c_char; 128usize],
-    pub id: [c_char; 128usize],
-    pub elementWidth: c_int,
-    pub elementHeight: c_int,
-    pub screenWidth: c_int,
-    pub screenHeight: c_int,
-}
-#[test]
-fn bindgen_test_layout_EmscriptenFullscreenChangeEvent() {
-    assert_eq!(mem::size_of::<EmscriptenFullscreenChangeEvent>(), 280usize);
-    assert_eq!(mem::align_of::<EmscriptenFullscreenChangeEvent>(), 4usize);
-}
-
-#[repr(C)]
-#[derive(Debug, Copy)]
-pub struct EmscriptenKeyboardEvent {
-    pub key: [c_char; 32usize],
-    pub code: [c_char; 32usize],
-    pub location: c_ulong,
-    pub ctrlKey: c_int,
-    pub shiftKey: c_int,
-    pub altKey: c_int,
-    pub metaKey: c_int,
-    pub repeat: c_int,
-    pub locale: [c_char; 32usize],
-    pub charValue: [c_char; 32usize],
-    pub charCode: c_ulong,
-    pub keyCode: c_ulong,
-    pub which: c_ulong,
-}
-#[test]
-fn bindgen_test_layout_EmscriptenKeyboardEvent() {
-    assert_eq!(mem::size_of::<EmscriptenKeyboardEvent>(), 184usize);
-    assert_eq!(mem::align_of::<EmscriptenKeyboardEvent>(), 8usize);
-}
-impl Clone for EmscriptenKeyboardEvent {
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
-#[repr(C)]
-#[derive(Debug, Copy, Clone)]
-pub struct EmscriptenMouseEvent {
-    pub timestamp: f64,
-    pub screenX: c_long,
-    pub screenY: c_long,
-    pub clientX: c_long,
-    pub clientY: c_long,
-    pub ctrlKey: c_int,
-    pub shiftKey: c_int,
-    pub altKey: c_int,
-    pub metaKey: c_int,
-    pub button: c_ushort,
-    pub buttons: c_ushort,
-    pub movementX: c_long,
-    pub movementY: c_long,
-    pub targetX: c_long,
-    pub targetY: c_long,
-    pub canvasX: c_long,
-    pub canvasY: c_long,
-    pub padding: c_long,
-}
-#[test]
-fn bindgen_test_layout_EmscriptenMouseEvent() {
-    assert_eq!(mem::size_of::<EmscriptenMouseEvent>(), 120usize);
-    assert_eq!(mem::align_of::<EmscriptenMouseEvent>(), 8usize);
-}
-
-#[repr(C)]
-#[derive(Debug, Copy, Clone)]
-pub struct EmscriptenTouchPoint {
-    pub identifier: c_long,
-    pub screenX: c_long,
-    pub screenY: c_long,
-    pub clientX: c_long,
-    pub clientY: c_long,
-    pub pageX: c_long,
-    pub pageY: c_long,
-    pub isChanged: c_int,
-    pub onTarget: c_int,
-    pub targetX: c_long,
-    pub targetY: c_long,
-    pub canvasX: c_long,
-    pub canvasY: c_long,
-}
-#[test]
-fn bindgen_test_layout_EmscriptenTouchPoint() {
-    assert_eq!(mem::size_of::<EmscriptenTouchPoint>(), 96usize);
-    assert_eq!(mem::align_of::<EmscriptenTouchPoint>(), 8usize);
-}
-
-#[repr(C)]
-#[derive(Debug, Copy, Clone)]
-pub struct EmscriptenTouchEvent {
-    pub numTouches: c_int,
-    pub ctrlKey: c_int,
-    pub shiftKey: c_int,
-    pub altKey: c_int,
-    pub metaKey: c_int,
-    pub touches: [EmscriptenTouchPoint; 32usize],
-}
-#[test]
-fn bindgen_test_layout_EmscriptenTouchEvent() {
-    assert_eq!(mem::size_of::<EmscriptenTouchEvent>(), 3096usize);
-    assert_eq!(mem::align_of::<EmscriptenTouchEvent>(), 8usize);
-}
-
-#[repr(C)]
-pub struct EmscriptenPointerlockChangeEvent {
-    pub isActive: c_int,
-    pub nodeName: [c_char; 128usize],
-    pub id: [c_char; 128usize],
-}
-#[test]
-fn bindgen_test_layout_EmscriptenPointerlockChangeEvent() {
-    assert_eq!(mem::size_of::<EmscriptenPointerlockChangeEvent>(), 260usize);
-    assert_eq!(mem::align_of::<EmscriptenPointerlockChangeEvent>(), 4usize);
-}
-
-extern "C" {
-    pub fn emscripten_set_canvas_size(width: c_int, height: c_int) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_get_canvas_size(
-        width: *mut c_int,
-        height: *mut c_int,
-        is_fullscreen: *mut c_int,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_element_css_size(
-        target: *const c_char,
-        width: c_double,
-        height: c_double,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_get_element_css_size(
-        target: *const c_char,
-        width: *mut c_double,
-        height: *mut c_double,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_request_pointerlock(
-        target: *const c_char,
-        deferUntilInEventHandler: EM_BOOL,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_exit_pointerlock() -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_request_fullscreen(
-        target: *const c_char,
-        deferUntilInEventHandler: EM_BOOL,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_exit_fullscreen() -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_keydown_callback(
-        target: *const c_char,
-        userData: *mut c_void,
-        useCapture: EM_BOOL,
-        callback: em_key_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_keyup_callback(
-        target: *const c_char,
-        userData: *mut c_void,
-        useCapture: EM_BOOL,
-        callback: em_key_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_mousemove_callback(
-        target: *const c_char,
-        user_data: *mut c_void,
-        use_capture: EM_BOOL,
-        callback: em_mouse_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_mousedown_callback(
-        target: *const c_char,
-        user_data: *mut c_void,
-        use_capture: EM_BOOL,
-        callback: em_mouse_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_mouseup_callback(
-        target: *const c_char,
-        user_data: *mut c_void,
-        use_capture: EM_BOOL,
-        callback: em_mouse_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_hide_mouse();
-
-    pub fn emscripten_get_device_pixel_ratio() -> f64;
-
-    pub fn emscripten_set_pointerlockchange_callback(
-        target: *const c_char,
-        userData: *mut c_void,
-        useCapture: EM_BOOL,
-        callback: em_pointerlockchange_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_fullscreenchange_callback(
-        target: *const c_char,
-        userData: *mut c_void,
-        useCapture: EM_BOOL,
-        callback: em_fullscreenchange_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_asm_const(code: *const c_char);
-
-    pub fn emscripten_set_main_loop(
-        func: em_callback_func,
-        fps: c_int,
-        simulate_infinite_loop: EM_BOOL,
-    );
-
-    pub fn emscripten_cancel_main_loop();
-
-    pub fn emscripten_set_touchstart_callback(
-        target: *const c_char,
-        userData: *mut c_void,
-        useCapture: c_int,
-        callback: em_touch_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_touchend_callback(
-        target: *const c_char,
-        userData: *mut c_void,
-        useCapture: c_int,
-        callback: em_touch_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_touchmove_callback(
-        target: *const c_char,
-        userData: *mut c_void,
-        useCapture: c_int,
-        callback: em_touch_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-
-    pub fn emscripten_set_touchcancel_callback(
-        target: *const c_char,
-        userData: *mut c_void,
-        useCapture: c_int,
-        callback: em_touch_callback_func,
-    ) -> EMSCRIPTEN_RESULT;
-}
--- a/src/platform_impl/emscripten/mod.rs
+++ b/src/platform_impl/emscripten/mod.rs
--- a/src/platform_impl/ios/app_state.rs
+++ b/src/platform_impl/ios/app_state.rs
--- a/src/platform_impl/ios/event_loop.rs
+++ b/src/platform_impl/ios/event_loop.rs
@@ -16,15 +16,14 @@ use crate::{
 };

 use crate::platform_impl::platform::{
-    app_state::AppState,
+    app_state,
    ffi::{
        id, kCFRunLoopAfterWaiting, kCFRunLoopBeforeWaiting, kCFRunLoopCommonModes,
        kCFRunLoopDefaultMode, kCFRunLoopEntry, kCFRunLoopExit, nil, CFIndex, CFRelease,
        CFRunLoopActivity, CFRunLoopAddObserver, CFRunLoopAddSource, CFRunLoopGetMain,
        CFRunLoopObserverCreate, CFRunLoopObserverRef, CFRunLoopSourceContext,
        CFRunLoopSourceCreate, CFRunLoopSourceInvalidate, CFRunLoopSourceRef,
-        CFRunLoopSourceSignal, CFRunLoopWakeUp, NSOperatingSystemVersion, NSString,
-        UIApplicationMain, UIUserInterfaceIdiom,
+        CFRunLoopSourceSignal, CFRunLoopWakeUp, NSString, UIApplicationMain, UIUserInterfaceIdiom,
    },
    monitor, view, MonitorHandle,
 };
@@ -32,13 +31,6 @@ use crate::platform_impl::platform::{
 pub struct EventLoopWindowTarget<T: 'static> {
    receiver: Receiver<T>,
    sender_to_clone: Sender<T>,
-    capabilities: Capabilities,
-}
-
-impl<T: 'static> EventLoopWindowTarget<T> {
-    pub fn capabilities(&self) -> &Capabilities {
-        &self.capabilities
-    }
 }

 pub struct EventLoop<T: 'static> {
@@ -64,18 +56,11 @@ impl<T: 'static> EventLoop<T> {
        // this line sets up the main run loop before `UIApplicationMain`
        setup_control_flow_observers();

-        let version: NSOperatingSystemVersion = unsafe {
-            let process_info: id = msg_send![class!(NSProcessInfo), processInfo];
-            msg_send![process_info, operatingSystemVersion]
-        };
-        let capabilities = version.into();
-
        EventLoop {
            window_target: RootEventLoopWindowTarget {
                p: EventLoopWindowTarget {
                    receiver,
                    sender_to_clone,
-                    capabilities,
                },
                _marker: PhantomData,
            },
@@ -95,7 +80,7 @@ impl<T: 'static> EventLoop<T> {
                 `EventLoop` cannot be `run` after a call to `UIApplicationMain` on iOS\n\
                 Note: `EventLoop::run` calls `UIApplicationMain` on iOS"
            );
-            AppState::will_launch(Box::new(EventLoopHandler {
+            app_state::will_launch(Box::new(EventLoopHandler {
                f: event_handler,
                event_loop: self.window_target,
            }));
@@ -170,7 +155,7 @@ impl<T> EventLoopProxy<T> {
            let rl = CFRunLoopGetMain();
            // we want all the members of context to be zero/null, except one
            let mut context: CFRunLoopSourceContext = mem::zeroed();
-            context.perform = event_loop_proxy_handler;
+            context.perform = Some(event_loop_proxy_handler);
            let source =
                CFRunLoopSourceCreate(ptr::null_mut(), CFIndex::max_value() - 1, &mut context);
            CFRunLoopAddSource(rl, source, kCFRunLoopCommonModes);
@@ -180,8 +165,10 @@ impl<T> EventLoopProxy<T> {
        }
    }

-    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed> {
-        self.sender.send(event).map_err(|_| EventLoopClosed)?;
+    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
+        self.sender
+            .send(event)
+            .map_err(|::std::sync::mpsc::SendError(x)| EventLoopClosed(x))?;
        unsafe {
            // let the main thread know there's a new event
            CFRunLoopSourceSignal(self.source);
@@ -203,15 +190,40 @@ fn setup_control_flow_observers() {
            unsafe {
                #[allow(non_upper_case_globals)]
                match activity {
-                    kCFRunLoopAfterWaiting => AppState::handle_wakeup_transition(),
+                    kCFRunLoopAfterWaiting => app_state::handle_wakeup_transition(),
                    kCFRunLoopEntry => unimplemented!(), // not expected to ever happen
                    _ => unreachable!(),
                }
            }
        }

+        // Core Animation registers its `CFRunLoopObserver` that performs drawing operations in
+        // `CA::Transaction::ensure_implicit` with a priority of `0x1e8480`. We set the main_end
+        // priority to be 0, in order to send EventsCleared before RedrawRequested. This value was
+        // chosen conservatively to guard against apple using different priorities for their redraw
+        // observers in different OS's or on different devices. If it so happens that it's too
+        // conservative, the main symptom would be non-redraw events coming in after `EventsCleared`.
+        //
+        // The value of `0x1e8480` was determined by inspecting stack traces and the associated
+        // registers for every `CFRunLoopAddObserver` call on an iPad Air 2 running iOS 11.4.
+        //
+        // Also tested to be `0x1e8480` on iPhone 8, iOS 13 beta 4.
+        extern "C" fn control_flow_main_end_handler(
+            _: CFRunLoopObserverRef,
+            activity: CFRunLoopActivity,
+            _: *mut c_void,
+        ) {
+            unsafe {
+                #[allow(non_upper_case_globals)]
+                match activity {
+                    kCFRunLoopBeforeWaiting => app_state::handle_main_events_cleared(),
+                    kCFRunLoopExit => unimplemented!(), // not expected to ever happen
+                    _ => unreachable!(),
+                }
+            }
+        }
+
        // end is queued with the lowest priority to ensure it is processed after other observers
-        // without that, LoopDestroyed will get sent after EventsCleared
        extern "C" fn control_flow_end_handler(
            _: CFRunLoopObserverRef,
            activity: CFRunLoopActivity,
@@ -220,7 +232,7 @@ fn setup_control_flow_observers() {
            unsafe {
                #[allow(non_upper_case_globals)]
                match activity {
-                    kCFRunLoopBeforeWaiting => AppState::handle_events_cleared(),
+                    kCFRunLoopBeforeWaiting => app_state::handle_events_cleared(),
                    kCFRunLoopExit => unimplemented!(), // not expected to ever happen
                    _ => unreachable!(),
                }
@@ -228,6 +240,7 @@ fn setup_control_flow_observers() {
        }

        let main_loop = CFRunLoopGetMain();
+
        let begin_observer = CFRunLoopObserverCreate(
            ptr::null_mut(),
            kCFRunLoopEntry | kCFRunLoopAfterWaiting,
@@ -237,6 +250,17 @@ fn setup_control_flow_observers() {
            ptr::null_mut(),
        );
        CFRunLoopAddObserver(main_loop, begin_observer, kCFRunLoopDefaultMode);
+
+        let main_end_observer = CFRunLoopObserverCreate(
+            ptr::null_mut(),
+            kCFRunLoopExit | kCFRunLoopBeforeWaiting,
+            1, // repeat = true
+            0, // see comment on `control_flow_main_end_handler`
+            control_flow_main_end_handler,
+            ptr::null_mut(),
+        );
+        CFRunLoopAddObserver(main_loop, main_end_observer, kCFRunLoopDefaultMode);
+
        let end_observer = CFRunLoopObserverCreate(
            ptr::null_mut(),
            kCFRunLoopExit | kCFRunLoopBeforeWaiting,
@@ -296,20 +320,3 @@ pub unsafe fn get_idiom() -> Idiom {
    let raw_idiom: UIUserInterfaceIdiom = msg_send![device, userInterfaceIdiom];
    raw_idiom.into()
 }
-
-pub struct Capabilities {
-    pub supports_safe_area: bool,
-}
-
-impl From<NSOperatingSystemVersion> for Capabilities {
-    fn from(os_version: NSOperatingSystemVersion) -> Capabilities {
-        assert!(
-            os_version.major >= 8,
-            "`winit` current requires iOS version 8 or greater"
-        );
-
-        let supports_safe_area = os_version.major >= 11;
-
-        Capabilities { supports_safe_area }
-    }
-}
--- a/src/platform_impl/ios/ffi.rs
+++ b/src/platform_impl/ios/ffi.rs
@@ -331,14 +331,14 @@ pub enum CFRunLoopTimerContext {}
 pub struct CFRunLoopSourceContext {
    pub version: CFIndex,
    pub info: *mut c_void,
-    pub retain: extern "C" fn(*const c_void) -> *const c_void,
-    pub release: extern "C" fn(*const c_void),
-    pub copyDescription: extern "C" fn(*const c_void) -> CFStringRef,
-    pub equal: extern "C" fn(*const c_void, *const c_void) -> Boolean,
-    pub hash: extern "C" fn(*const c_void) -> CFHashCode,
-    pub schedule: extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode),
-    pub cancel: extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode),
-    pub perform: extern "C" fn(*mut c_void),
+    pub retain: Option<extern "C" fn(*const c_void) -> *const c_void>,
+    pub release: Option<extern "C" fn(*const c_void)>,
+    pub copyDescription: Option<extern "C" fn(*const c_void) -> CFStringRef>,
+    pub equal: Option<extern "C" fn(*const c_void, *const c_void) -> Boolean>,
+    pub hash: Option<extern "C" fn(*const c_void) -> CFHashCode>,
+    pub schedule: Option<extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode)>,
+    pub cancel: Option<extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode)>,
+    pub perform: Option<extern "C" fn(*mut c_void)>,
 }

 pub trait NSString: Sized {
--- a/src/platform_impl/ios/monitor.rs
+++ b/src/platform_impl/ios/monitor.rs
@@ -7,7 +7,10 @@ use std::{
 use crate::{
    dpi::{PhysicalPosition, PhysicalSize},
    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
-    platform_impl::platform::ffi::{id, nil, CGFloat, CGRect, CGSize, NSInteger, NSUInteger},
+    platform_impl::platform::{
+        app_state,
+        ffi::{id, nil, CGFloat, CGRect, CGSize, NSInteger, NSUInteger},
+    },
 };

 #[derive(Debug, PartialEq, Eq, Hash)]
@@ -35,7 +38,7 @@ impl Drop for VideoMode {
    fn drop(&mut self) {
        unsafe {
            assert_main_thread!("`VideoMode` can only be dropped on the main thread on iOS");
-            msg_send![self.screen_mode, release];
+            let () = msg_send![self.screen_mode, release];
        }
    }
 }
@@ -43,7 +46,23 @@ impl Drop for VideoMode {
 impl VideoMode {
    unsafe fn retained_new(uiscreen: id, screen_mode: id) -> VideoMode {
        assert_main_thread!("`VideoMode` can only be created on the main thread on iOS");
-        let refresh_rate: NSInteger = msg_send![uiscreen, maximumFramesPerSecond];
+        let os_capabilities = app_state::os_capabilities();
+        let refresh_rate: NSInteger = if os_capabilities.maximum_frames_per_second {
+            msg_send![uiscreen, maximumFramesPerSecond]
+        } else {
+            // https://developer.apple.com/library/archive/technotes/tn2460/_index.html
+            // https://en.wikipedia.org/wiki/IPad_Pro#Model_comparison
+            //
+            // All iOS devices support 60 fps, and on devices where `maximumFramesPerSecond` is not
+            // supported, they are all guaranteed to have 60hz refresh rates. This does not
+            // correctly handle external displays. ProMotion displays support 120fps, but they were
+            // introduced at the same time as the `maximumFramesPerSecond` API.
+            //
+            // FIXME: earlier OSs could calculate the refresh rate using
+            // `-[CADisplayLink duration]`.
+            os_capabilities.maximum_frames_per_second_err_msg("defaulting to 60 fps");
+            60
+        };
        let size: CGSize = msg_send![screen_mode, size];
        VideoMode {
            size: (size.width as u32, size.height as u32),
--- a/src/platform_impl/ios/view.rs
+++ b/src/platform_impl/ios/view.rs
@@ -9,7 +9,7 @@ use crate::{
    event::{DeviceId as RootDeviceId, Event, Force, Touch, TouchPhase, WindowEvent},
    platform::ios::MonitorHandleExtIOS,
    platform_impl::platform::{
-        app_state::AppState,
+        app_state::{self, OSCapabilities},
        event_loop,
        ffi::{
            id, nil, CGFloat, CGPoint, CGRect, UIForceTouchCapability, UIInterfaceOrientationMask,
@@ -27,24 +27,49 @@ macro_rules! add_property {
        $name:ident: $t:ty,
        $setter_name:ident: |$object:ident| $after_set:expr,
        $getter_name:ident,
+    ) => {
+        add_property!(
+            $decl,
+            $name: $t,
+            $setter_name: true, |_, _|{}; |$object| $after_set,
+            $getter_name,
+        )
+    };
+    (
+        $decl:ident,
+        $name:ident: $t:ty,
+        $setter_name:ident: $capability:expr, $err:expr; |$object:ident| $after_set:expr,
+        $getter_name:ident,
    ) => {
        {
            const VAR_NAME: &'static str = concat!("_", stringify!($name));
            $decl.add_ivar::<$t>(VAR_NAME);
-            #[allow(non_snake_case)]
-            extern "C" fn $setter_name($object: &mut Object, _: Sel, value: $t) {
-                unsafe {
-                    $object.set_ivar::<$t>(VAR_NAME, value);
+            let setter = if $capability {
+                #[allow(non_snake_case)]
+                extern "C" fn $setter_name($object: &mut Object, _: Sel, value: $t) {
+                    unsafe {
+                        $object.set_ivar::<$t>(VAR_NAME, value);
+                    }
+                    $after_set
                }
-                $after_set
-            }
+                $setter_name
+            } else {
+                #[allow(non_snake_case)]
+                extern "C" fn $setter_name($object: &mut Object, _: Sel, value: $t) {
+                    unsafe {
+                        $object.set_ivar::<$t>(VAR_NAME, value);
+                    }
+                    $err(&app_state::os_capabilities(), "ignoring")
+                }
+                $setter_name
+            };
            #[allow(non_snake_case)]
            extern "C" fn $getter_name($object: &Object, _: Sel) -> $t {
                unsafe { *$object.get_ivar::<$t>(VAR_NAME) }
            }
            $decl.add_method(
                sel!($setter_name:),
-                $setter_name as extern "C" fn(&mut Object, Sel, $t),
+                setter as extern "C" fn(&mut Object, Sel, $t),
            );
            $decl.add_method(
                sel!($getter_name),
@@ -76,7 +101,8 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
        extern "C" fn draw_rect(object: &Object, _: Sel, rect: CGRect) {
            unsafe {
                let window: id = msg_send![object, window];
-                AppState::handle_nonuser_event(Event::WindowEvent {
+                assert!(!window.is_null());
+                app_state::handle_nonuser_event(Event::WindowEvent {
                    window_id: RootWindowId(window.into()),
                    event: WindowEvent::RedrawRequested,
                });
@@ -87,7 +113,11 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {

        extern "C" fn layout_subviews(object: &Object, _: Sel) {
            unsafe {
+                let superclass: &'static Class = msg_send![object, superclass];
+                let () = msg_send![super(object, superclass), layoutSubviews];
+
                let window: id = msg_send![object, window];
+                assert!(!window.is_null());
                let bounds: CGRect = msg_send![window, bounds];
                let screen: id = msg_send![window, screen];
                let screen_space: id = msg_send![screen, coordinateSpace];
@@ -97,12 +127,129 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
                    width: screen_frame.size.width as _,
                    height: screen_frame.size.height as _,
                };
-                AppState::handle_nonuser_event(Event::WindowEvent {
+                app_state::handle_nonuser_event(Event::WindowEvent {
                    window_id: RootWindowId(window.into()),
                    event: WindowEvent::Resized(size),
                });
+            }
+        }
+
+        extern "C" fn set_content_scale_factor(
+            object: &mut Object,
+            _: Sel,
+            untrusted_hidpi_factor: CGFloat,
+        ) {
+            unsafe {
                let superclass: &'static Class = msg_send![object, superclass];
-                let () = msg_send![super(object, superclass), layoutSubviews];
+                let () = msg_send![
+                    super(object, superclass),
+                    setContentScaleFactor: untrusted_hidpi_factor
+                ];
+
+                let window: id = msg_send![object, window];
+                // `window` is null when `setContentScaleFactor` is invoked prior to `[UIWindow
+                // makeKeyAndVisible]` at window creation time (either manually or internally by
+                // UIKit when the `UIView` is first created), in which case we send no events here
+                if window.is_null() {
+                    return;
+                }
+                // `setContentScaleFactor` may be called with a value of 0, which means "reset the
+                // content scale factor to a device-specific default value", so we can't use the
+                // parameter here. We can query the actual factor using the getter
+                let hidpi_factor: CGFloat = msg_send![object, contentScaleFactor];
+                assert!(
+                    !hidpi_factor.is_nan()
+                        && hidpi_factor.is_finite()
+                        && hidpi_factor.is_sign_positive()
+                        && hidpi_factor > 0.0,
+                    "invalid hidpi_factor set on UIView",
+                );
+                let bounds: CGRect = msg_send![object, bounds];
+                let screen: id = msg_send![window, screen];
+                let screen_space: id = msg_send![screen, coordinateSpace];
+                let screen_frame: CGRect =
+                    msg_send![object, convertRect:bounds toCoordinateSpace:screen_space];
+                let size = crate::dpi::LogicalSize {
+                    width: screen_frame.size.width as _,
+                    height: screen_frame.size.height as _,
+                };
+                app_state::handle_nonuser_events(
+                    std::iter::once(Event::WindowEvent {
+                        window_id: RootWindowId(window.into()),
+                        event: WindowEvent::HiDpiFactorChanged(hidpi_factor as _),
+                    })
+                    .chain(std::iter::once(Event::WindowEvent {
+                        window_id: RootWindowId(window.into()),
+                        event: WindowEvent::Resized(size),
+                    })),
+                );
+            }
+        }
+
+        extern "C" fn handle_touches(object: &Object, _: Sel, touches: id, _: id) {
+            unsafe {
+                let window: id = msg_send![object, window];
+                assert!(!window.is_null());
+                let uiscreen: id = msg_send![window, screen];
+                let touches_enum: id = msg_send![touches, objectEnumerator];
+                let mut touch_events = Vec::new();
+                let os_supports_force = app_state::os_capabilities().force_touch;
+                loop {
+                    let touch: id = msg_send![touches_enum, nextObject];
+                    if touch == nil {
+                        break;
+                    }
+                    let location: CGPoint = msg_send![touch, locationInView: nil];
+                    let touch_type: UITouchType = msg_send![touch, type];
+                    let force = if os_supports_force {
+                        let trait_collection: id = msg_send![object, traitCollection];
+                        let touch_capability: UIForceTouchCapability =
+                            msg_send![trait_collection, forceTouchCapability];
+                        // Both the OS _and_ the device need to be checked for force touch support.
+                        if touch_capability == UIForceTouchCapability::Available {
+                            let force: CGFloat = msg_send![touch, force];
+                            let max_possible_force: CGFloat =
+                                msg_send![touch, maximumPossibleForce];
+                            let altitude_angle: Option<f64> = if touch_type == UITouchType::Pencil {
+                                let angle: CGFloat = msg_send![touch, altitudeAngle];
+                                Some(angle as _)
+                            } else {
+                                None
+                            };
+                            Some(Force::Calibrated {
+                                force: force as _,
+                                max_possible_force: max_possible_force as _,
+                                altitude_angle,
+                            })
+                        } else {
+                            None
+                        }
+                    } else {
+                        None
+                    };
+                    let touch_id = touch as u64;
+                    let phase: UITouchPhase = msg_send![touch, phase];
+                    let phase = match phase {
+                        UITouchPhase::Began => TouchPhase::Started,
+                        UITouchPhase::Moved => TouchPhase::Moved,
+                        // 2 is UITouchPhase::Stationary and is not expected here
+                        UITouchPhase::Ended => TouchPhase::Ended,
+                        UITouchPhase::Cancelled => TouchPhase::Cancelled,
+                        _ => panic!("unexpected touch phase: {:?}", phase as i32),
+                    };
+
+                    touch_events.push(Event::WindowEvent {
+                        window_id: RootWindowId(window.into()),
+                        event: WindowEvent::Touch(Touch {
+                            device_id: RootDeviceId(DeviceId { uiscreen }),
+                            id: touch_id,
+                            location: (location.x as f64, location.y as f64).into(),
+                            force,
+                            phase,
+                        }),
+                    });
+                }
+                app_state::handle_nonuser_events(touch_events);
            }
        }

@@ -117,6 +264,28 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
            sel!(layoutSubviews),
            layout_subviews as extern "C" fn(&Object, Sel),
        );
+        decl.add_method(
+            sel!(setContentScaleFactor:),
+            set_content_scale_factor as extern "C" fn(&mut Object, Sel, CGFloat),
+        );
+
+        decl.add_method(
+            sel!(touchesBegan:withEvent:),
+            handle_touches as extern "C" fn(this: &Object, _: Sel, _: id, _: id),
+        );
+        decl.add_method(
+            sel!(touchesMoved:withEvent:),
+            handle_touches as extern "C" fn(this: &Object, _: Sel, _: id, _: id),
+        );
+        decl.add_method(
+            sel!(touchesEnded:withEvent:),
+            handle_touches as extern "C" fn(this: &Object, _: Sel, _: id, _: id),
+        );
+        decl.add_method(
+            sel!(touchesCancelled:withEvent:),
+            handle_touches as extern "C" fn(this: &Object, _: Sel, _: id, _: id),
+        );
+
        decl.register()
    })
 }
@@ -125,6 +294,8 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
 unsafe fn get_view_controller_class() -> &'static Class {
    static mut CLASS: Option<&'static Class> = None;
    if CLASS.is_none() {
+        let os_capabilities = app_state::os_capabilities();
+
        let uiviewcontroller_class = class!(UIViewController);

        extern "C" fn should_autorotate(_: &Object, _: Sel) -> BOOL {
@@ -150,11 +321,14 @@ unsafe fn get_view_controller_class() -> &'static Class {
        add_property! {
            decl,
            prefers_home_indicator_auto_hidden: BOOL,
-            setPrefersHomeIndicatorAutoHidden: |object| {
-                unsafe {
-                    let () = msg_send![object, setNeedsUpdateOfHomeIndicatorAutoHidden];
-                }
-            },
+            setPrefersHomeIndicatorAutoHidden:
+                os_capabilities.home_indicator_hidden,
+                OSCapabilities::home_indicator_hidden_err_msg;
+                |object| {
+                    unsafe {
+                        let () = msg_send![object, setNeedsUpdateOfHomeIndicatorAutoHidden];
+                    }
+                },
            prefersHomeIndicatorAutoHidden,
        }
        add_property! {
@@ -170,11 +344,14 @@ unsafe fn get_view_controller_class() -> &'static Class {
        add_property! {
            decl,
            preferred_screen_edges_deferring_system_gestures: UIRectEdge,
-            setPreferredScreenEdgesDeferringSystemGestures: |object| {
-                unsafe {
-                    let () = msg_send![object, setNeedsUpdateOfScreenEdgesDeferringSystemGestures];
-                }
-            },
+            setPreferredScreenEdgesDeferringSystemGestures:
+                os_capabilities.defer_system_gestures,
+                OSCapabilities::defer_system_gestures_err_msg;
+                |object| {
+                    unsafe {
+                        let () = msg_send![object, setNeedsUpdateOfScreenEdgesDeferringSystemGestures];
+                    }
+                },
            preferredScreenEdgesDeferringSystemGestures,
        }
        CLASS = Some(decl.register());
@@ -190,7 +367,7 @@ unsafe fn get_window_class() -> &'static Class {

        extern "C" fn become_key_window(object: &Object, _: Sel) {
            unsafe {
-                AppState::handle_nonuser_event(Event::WindowEvent {
+                app_state::handle_nonuser_event(Event::WindowEvent {
                    window_id: RootWindowId(object.into()),
                    event: WindowEvent::Focused(true),
                });
@@ -200,7 +377,7 @@ unsafe fn get_window_class() -> &'static Class {

        extern "C" fn resign_key_window(object: &Object, _: Sel) {
            unsafe {
-                AppState::handle_nonuser_event(Event::WindowEvent {
+                app_state::handle_nonuser_event(Event::WindowEvent {
                    window_id: RootWindowId(object.into()),
                    event: WindowEvent::Focused(false),
                });
@@ -208,95 +385,6 @@ unsafe fn get_window_class() -> &'static Class {
            }
        }

-        extern "C" fn handle_touches(object: &Object, _: Sel, touches: id, _: id) {
-            unsafe {
-                let uiscreen = msg_send![object, screen];
-                let touches_enum: id = msg_send![touches, objectEnumerator];
-                let mut touch_events = Vec::new();
-                loop {
-                    let touch: id = msg_send![touches_enum, nextObject];
-                    if touch == nil {
-                        break;
-                    }
-                    let location: CGPoint = msg_send![touch, locationInView: nil];
-                    let touch_type: UITouchType = msg_send![touch, type];
-                    let trait_collection: id = msg_send![object, traitCollection];
-                    let touch_capability: UIForceTouchCapability =
-                        msg_send![trait_collection, forceTouchCapability];
-                    let force = if touch_capability == UIForceTouchCapability::Available {
-                        let force: CGFloat = msg_send![touch, force];
-                        let max_possible_force: CGFloat = msg_send![touch, maximumPossibleForce];
-                        let altitude_angle: Option<f64> = if touch_type == UITouchType::Pencil {
-                            let angle: CGFloat = msg_send![touch, altitudeAngle];
-                            Some(angle as _)
-                        } else {
-                            None
-                        };
-                        Some(Force::Calibrated {
-                            force: force as _,
-                            max_possible_force: max_possible_force as _,
-                            altitude_angle,
-                        })
-                    } else {
-                        None
-                    };
-                    let touch_id = touch as u64;
-                    let phase: UITouchPhase = msg_send![touch, phase];
-                    let phase = match phase {
-                        UITouchPhase::Began => TouchPhase::Started,
-                        UITouchPhase::Moved => TouchPhase::Moved,
-                        // 2 is UITouchPhase::Stationary and is not expected here
-                        UITouchPhase::Ended => TouchPhase::Ended,
-                        UITouchPhase::Cancelled => TouchPhase::Cancelled,
-                        _ => panic!("unexpected touch phase: {:?}", phase as i32),
-                    };
-
-                    touch_events.push(Event::WindowEvent {
-                        window_id: RootWindowId(object.into()),
-                        event: WindowEvent::Touch(Touch {
-                            device_id: RootDeviceId(DeviceId { uiscreen }),
-                            id: touch_id,
-                            location: (location.x as f64, location.y as f64).into(),
-                            force,
-                            phase,
-                        }),
-                    });
-                }
-                AppState::handle_nonuser_events(touch_events);
-            }
-        }
-
-        extern "C" fn set_content_scale_factor(object: &mut Object, _: Sel, hidpi_factor: CGFloat) {
-            unsafe {
-                let () = msg_send![
-                    super(object, class!(UIWindow)),
-                    setContentScaleFactor: hidpi_factor
-                ];
-                let view_controller: id = msg_send![object, rootViewController];
-                let view: id = msg_send![view_controller, view];
-                let () = msg_send![view, setContentScaleFactor: hidpi_factor];
-                let bounds: CGRect = msg_send![object, bounds];
-                let screen: id = msg_send![object, screen];
-                let screen_space: id = msg_send![screen, coordinateSpace];
-                let screen_frame: CGRect =
-                    msg_send![object, convertRect:bounds toCoordinateSpace:screen_space];
-                let size = crate::dpi::LogicalSize {
-                    width: screen_frame.size.width as _,
-                    height: screen_frame.size.height as _,
-                };
-                AppState::handle_nonuser_events(
-                    std::iter::once(Event::WindowEvent {
-                        window_id: RootWindowId(object.into()),
-                        event: WindowEvent::HiDpiFactorChanged(hidpi_factor as _),
-                    })
-                    .chain(std::iter::once(Event::WindowEvent {
-                        window_id: RootWindowId(object.into()),
-                        event: WindowEvent::Resized(size),
-                    })),
-                );
-            }
-        }
-
        let mut decl = ClassDecl::new("WinitUIWindow", uiwindow_class)
            .expect("Failed to declare class `WinitUIWindow`");
        decl.add_method(
@@ -308,28 +396,6 @@ unsafe fn get_window_class() -> &'static Class {
            resign_key_window as extern "C" fn(&Object, Sel),
        );

-        decl.add_method(
-            sel!(touchesBegan:withEvent:),
-            handle_touches as extern "C" fn(this: &Object, _: Sel, _: id, _: id),
-        );
-        decl.add_method(
-            sel!(touchesMoved:withEvent:),
-            handle_touches as extern "C" fn(this: &Object, _: Sel, _: id, _: id),
-        );
-        decl.add_method(
-            sel!(touchesEnded:withEvent:),
-            handle_touches as extern "C" fn(this: &Object, _: Sel, _: id, _: id),
-        );
-        decl.add_method(
-            sel!(touchesCancelled:withEvent:),
-            handle_touches as extern "C" fn(this: &Object, _: Sel, _: id, _: id),
-        );
-
-        decl.add_method(
-            sel!(setContentScaleFactor:),
-            set_content_scale_factor as extern "C" fn(&mut Object, Sel, CGFloat),
-        );
-
        CLASS = Some(decl.register());
    }
    CLASS.unwrap()
@@ -348,6 +414,9 @@ pub unsafe fn create_view(
    let view: id = msg_send![view, initWithFrame: frame];
    assert!(!view.is_null(), "Failed to initialize `UIView` instance");
    let () = msg_send![view, setMultipleTouchEnabled: YES];
+    if let Some(hidpi_factor) = platform_attributes.hidpi_factor {
+        let () = msg_send![view, setContentScaleFactor: hidpi_factor as CGFloat];
+    }

    view
 }
@@ -411,7 +480,7 @@ pub unsafe fn create_view_controller(
 // requires main thread
 pub unsafe fn create_window(
    window_attributes: &WindowAttributes,
-    platform_attributes: &PlatformSpecificWindowBuilderAttributes,
+    _platform_attributes: &PlatformSpecificWindowBuilderAttributes,
    frame: CGRect,
    view_controller: id,
 ) -> id {
@@ -425,9 +494,6 @@ pub unsafe fn create_window(
        "Failed to initialize `UIWindow` instance"
    );
    let () = msg_send![window, setRootViewController: view_controller];
-    if let Some(hidpi_factor) = platform_attributes.hidpi_factor {
-        let () = msg_send![window, setContentScaleFactor: hidpi_factor as CGFloat];
-    }
    match window_attributes.fullscreen {
        Some(Fullscreen::Exclusive(ref video_mode)) => {
            let uiscreen = video_mode.monitor().ui_screen() as id;
@@ -446,17 +512,17 @@ pub unsafe fn create_window(
 pub fn create_delegate_class() {
    extern "C" fn did_finish_launching(_: &mut Object, _: Sel, _: id, _: id) -> BOOL {
        unsafe {
-            AppState::did_finish_launching();
+            app_state::did_finish_launching();
        }
        YES
    }

    extern "C" fn did_become_active(_: &Object, _: Sel, _: id) {
-        unsafe { AppState::handle_nonuser_event(Event::Resumed) }
+        unsafe { app_state::handle_nonuser_event(Event::Resumed) }
    }

    extern "C" fn will_resign_active(_: &Object, _: Sel, _: id) {
-        unsafe { AppState::handle_nonuser_event(Event::Suspended) }
+        unsafe { app_state::handle_nonuser_event(Event::Suspended) }
    }

    extern "C" fn will_enter_foreground(_: &Object, _: Sel, _: id) {}
@@ -481,8 +547,8 @@ pub fn create_delegate_class() {
                    });
                }
            }
-            AppState::handle_nonuser_events(events);
-            AppState::terminated();
+            app_state::handle_nonuser_events(events);
+            app_state::terminated();
        }
    }

--- a/src/platform_impl/ios/window.rs
+++ b/src/platform_impl/ios/window.rs
@@ -4,31 +4,31 @@ use std::{
    ops::{Deref, DerefMut},
 };

-use objc::runtime::{Class, Object, NO, YES};
+use objc::runtime::{Class, Object, BOOL, NO, YES};

 use crate::{
    dpi::{self, LogicalPosition, LogicalSize},
    error::{ExternalError, NotSupportedError, OsError as RootOsError},
+    event::{Event, WindowEvent},
    icon::Icon,
    monitor::MonitorHandle as RootMonitorHandle,
    platform::ios::{MonitorHandleExtIOS, ScreenEdge, ValidOrientations},
    platform_impl::platform::{
-        app_state::AppState,
-        event_loop,
+        app_state, event_loop,
        ffi::{
            id, CGFloat, CGPoint, CGRect, CGSize, UIEdgeInsets, UIInterfaceOrientationMask,
            UIRectEdge, UIScreenOverscanCompensation,
        },
        monitor, view, EventLoopWindowTarget, MonitorHandle,
    },
-    window::{CursorIcon, Fullscreen, WindowAttributes},
+    window::{CursorIcon, Fullscreen, WindowAttributes, WindowId as RootWindowId},
 };

 pub struct Inner {
    pub window: id,
    pub view_controller: id,
    pub view: id,
-    supports_safe_area: bool,
+    gl_or_metal_backed: bool,
 }

 impl Drop for Inner {
@@ -59,7 +59,19 @@ impl Inner {

    pub fn request_redraw(&self) {
        unsafe {
-            let () = msg_send![self.view, setNeedsDisplay];
+            if self.gl_or_metal_backed {
+                // `setNeedsDisplay` does nothing on UIViews which are directly backed by CAEAGLLayer or CAMetalLayer.
+                // Ordinarily the OS sets up a bunch of UIKit state before calling drawRect: on a UIView, but when using
+                // raw or gl/metal for drawing this work is completely avoided.
+                //
+                // The docs for `setNeedsDisplay` don't mention `CAMetalLayer`; however, this has been confirmed via
+                // testing.
+                //
+                // https://developer.apple.com/documentation/uikit/uiview/1622437-setneedsdisplay?language=objc
+                app_state::queue_gl_or_metal_redraw(self.window);
+            } else {
+                let () = msg_send![self.view, setNeedsDisplay];
+            }
        }
    }

@@ -300,7 +312,7 @@ impl DerefMut for Window {

 impl Window {
    pub fn new<T>(
-        event_loop: &EventLoopWindowTarget<T>,
+        _event_loop: &EventLoopWindowTarget<T>,
        window_attributes: WindowAttributes,
        platform_attributes: PlatformSpecificWindowBuilderAttributes,
    ) -> Result<Window, RootOsError> {
@@ -338,6 +350,16 @@ impl Window {
            };

            let view = view::create_view(&window_attributes, &platform_attributes, frame.clone());
+
+            let gl_or_metal_backed = {
+                let view_class: id = msg_send![view, class];
+                let layer_class: id = msg_send![view_class, layerClass];
+                let is_metal: BOOL =
+                    msg_send![layer_class, isSubclassOfClass: class!(CAMetalLayer)];
+                let is_gl: BOOL = msg_send![layer_class, isSubclassOfClass: class!(CAEAGLLayer)];
+                is_metal == YES || is_gl == YES
+            };
+
            let view_controller =
                view::create_view_controller(&window_attributes, &platform_attributes, view);
            let window = view::create_window(
@@ -347,17 +369,41 @@ impl Window {
                view_controller,
            );

-            let supports_safe_area = event_loop.capabilities().supports_safe_area;
-
            let result = Window {
                inner: Inner {
                    window,
                    view_controller,
                    view,
-                    supports_safe_area,
+                    gl_or_metal_backed,
                },
            };
-            AppState::set_key_window(window);
+            app_state::set_key_window(window);
+
+            // Like the Windows and macOS backends, we send a `HiDpiFactorChanged` and `Resized`
+            // event on window creation if the DPI factor != 1.0
+            let hidpi_factor: CGFloat = msg_send![view, contentScaleFactor];
+            if hidpi_factor != 1.0 {
+                let bounds: CGRect = msg_send![view, bounds];
+                let screen: id = msg_send![window, screen];
+                let screen_space: id = msg_send![screen, coordinateSpace];
+                let screen_frame: CGRect =
+                    msg_send![view, convertRect:bounds toCoordinateSpace:screen_space];
+                let size = crate::dpi::LogicalSize {
+                    width: screen_frame.size.width as _,
+                    height: screen_frame.size.height as _,
+                };
+                app_state::handle_nonuser_events(
+                    std::iter::once(Event::WindowEvent {
+                        window_id: RootWindowId(window.into()),
+                        event: WindowEvent::HiDpiFactorChanged(hidpi_factor as _),
+                    })
+                    .chain(std::iter::once(Event::WindowEvent {
+                        window_id: RootWindowId(window.into()),
+                        event: WindowEvent::Resized(size),
+                    })),
+                );
+            }
+
            Ok(result)
        }
    }
@@ -396,13 +442,13 @@ impl Inner {
            msg_send![
                self.view_controller,
                setSupportedInterfaceOrientations: supported_orientations
-            ];
+            ]
        }
    }

    pub fn set_prefers_home_indicator_hidden(&self, hidden: bool) {
        unsafe {
-            let prefers_home_indicator_hidden = if hidden { NO } else { YES };
+            let prefers_home_indicator_hidden = if hidden { YES } else { NO };
            let () = msg_send![
                self.view_controller,
                setPrefersHomeIndicatorAutoHidden: prefers_home_indicator_hidden
@@ -462,7 +508,7 @@ impl Inner {
    // requires main thread
    unsafe fn safe_area_screen_space(&self) -> CGRect {
        let bounds: CGRect = msg_send![self.window, bounds];
-        if self.supports_safe_area {
+        if app_state::os_capabilities().safe_area {
            let safe_area: UIEdgeInsets = msg_send![self.window, safeAreaInsets];
            let safe_bounds = CGRect {
                origin: CGPoint {
--- a/src/platform_impl/linux/dlopen.rs
+++ b/src/platform_impl/linux/dlopen.rs
@@ -1,15 +0,0 @@
-#![cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd"))]
-#![allow(dead_code)]
-
-use std::os::raw::{c_char, c_int, c_void};
-
-pub const RTLD_LAZY: c_int = 0x001;
-pub const RTLD_NOW: c_int = 0x002;
-
-#[link(name = "dl")]
-extern "C" {
-    pub fn dlopen(filename: *const c_char, flag: c_int) -> *mut c_void;
-    pub fn dlerror() -> *mut c_char;
-    pub fn dlsym(handle: *mut c_void, symbol: *const c_char) -> *mut c_void;
-    pub fn dlclose(handle: *mut c_void) -> c_int;
-}
--- a/src/platform_impl/linux/mod.rs
+++ b/src/platform_impl/linux/mod.rs
@@ -7,7 +7,9 @@ use raw_window_handle::RawWindowHandle;
 use smithay_client_toolkit::reexports::client::ConnectError;

 pub use self::x11::XNotSupported;
-use self::x11::{ffi::XVisualInfo, get_xtarget, XConnection, XError};
+use self::x11::{
+    ffi::XVisualInfo, get_xtarget, util::WindowType as XWindowType, XConnection, XError,
+};
 use crate::{
    dpi::{LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize},
    error::{ExternalError, NotSupportedError, OsError as RootOsError},
@@ -18,7 +20,6 @@ use crate::{
    window::{CursorIcon, Fullscreen, WindowAttributes},
 };

-mod dlopen;
 pub mod wayland;
 pub mod x11;

@@ -31,7 +32,7 @@ pub mod x11;
 /// If this variable is set with any other value, winit will panic.
 const BACKEND_PREFERENCE_ENV_VAR: &str = "WINIT_UNIX_BACKEND";

-#[derive(Clone, Default)]
+#[derive(Clone)]
 pub struct PlatformSpecificWindowBuilderAttributes {
    pub visual_infos: Option<XVisualInfo>,
    pub screen_id: Option<i32>,
@@ -39,11 +40,27 @@ pub struct PlatformSpecificWindowBuilderAttributes {
    pub base_size: Option<(u32, u32)>,
    pub class: Option<(String, String)>,
    pub override_redirect: bool,
-    pub x11_window_type: x11::util::WindowType,
+    pub x11_window_types: Vec<XWindowType>,
    pub gtk_theme_variant: Option<String>,
    pub app_id: Option<String>,
 }

+impl Default for PlatformSpecificWindowBuilderAttributes {
+    fn default() -> Self {
+        Self {
+            visual_infos: None,
+            screen_id: None,
+            resize_increments: None,
+            base_size: None,
+            class: None,
+            override_redirect: false,
+            x11_window_types: vec![XWindowType::Normal],
+            gtk_theme_variant: None,
+            app_id: None,
+        }
+    }
+}
+
 lazy_static! {
    pub static ref X11_BACKEND: Mutex<Result<Arc<XConnection>, XNotSupported>> =
        { Mutex::new(XConnection::new(Some(x_error_callback)).map(Arc::new)) };
@@ -444,7 +461,7 @@ impl Window {

    pub fn raw_window_handle(&self) -> RawWindowHandle {
        match self {
-            &Window::X(ref window) => RawWindowHandle::X11(window.raw_window_handle()),
+            &Window::X(ref window) => RawWindowHandle::Xlib(window.raw_window_handle()),
            &Window::Wayland(ref window) => RawWindowHandle::Wayland(window.raw_window_handle()),
        }
    }
@@ -503,14 +520,22 @@ impl<T: 'static> Clone for EventLoopProxy<T> {

 impl<T: 'static> EventLoop<T> {
    pub fn new() -> EventLoop<T> {
+        assert_is_main_thread("new_any_thread");
+
+        EventLoop::new_any_thread()
+    }
+
+    pub fn new_any_thread() -> EventLoop<T> {
        if let Ok(env_var) = env::var(BACKEND_PREFERENCE_ENV_VAR) {
            match env_var.as_str() {
                "x11" => {
                    // TODO: propagate
-                    return EventLoop::new_x11().expect("Failed to initialize X11 backend");
+                    return EventLoop::new_x11_any_thread()
+                        .expect("Failed to initialize X11 backend");
                }
                "wayland" => {
-                    return EventLoop::new_wayland().expect("Failed to initialize Wayland backend");
+                    return EventLoop::new_wayland_any_thread()
+                        .expect("Failed to initialize Wayland backend");
                }
                _ => panic!(
                    "Unknown environment variable value for {}, try one of `x11`,`wayland`",
@@ -519,12 +544,12 @@ impl<T: 'static> EventLoop<T> {
            }
        }

-        let wayland_err = match EventLoop::new_wayland() {
+        let wayland_err = match EventLoop::new_wayland_any_thread() {
            Ok(event_loop) => return event_loop,
            Err(err) => err,
        };

-        let x11_err = match EventLoop::new_x11() {
+        let x11_err = match EventLoop::new_x11_any_thread() {
            Ok(event_loop) => return event_loop,
            Err(err) => err,
        };
@@ -537,10 +562,22 @@ impl<T: 'static> EventLoop<T> {
    }

    pub fn new_wayland() -> Result<EventLoop<T>, ConnectError> {
+        assert_is_main_thread("new_wayland_any_thread");
+
+        EventLoop::new_wayland_any_thread()
+    }
+
+    pub fn new_wayland_any_thread() -> Result<EventLoop<T>, ConnectError> {
        wayland::EventLoop::new().map(EventLoop::Wayland)
    }

    pub fn new_x11() -> Result<EventLoop<T>, XNotSupported> {
+        assert_is_main_thread("new_x11_any_thread");
+
+        EventLoop::new_x11_any_thread()
+    }
+
+    pub fn new_x11_any_thread() -> Result<EventLoop<T>, XNotSupported> {
        X11_BACKEND
            .lock()
            .as_ref()
@@ -613,7 +650,7 @@ impl<T: 'static> EventLoop<T> {
 }

 impl<T: 'static> EventLoopProxy<T> {
-    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed> {
+    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
        match *self {
            EventLoopProxy::Wayland(ref proxy) => proxy.send_event(event),
            EventLoopProxy::X(ref proxy) => proxy.send_event(event),
@@ -655,3 +692,35 @@ fn sticky_exit_callback<T, F>(
    // user callback
    callback(evt, target, cf)
 }
+
+fn assert_is_main_thread(suggested_method: &str) {
+    if !is_main_thread() {
+        panic!(
+            "Initializing the event loop outside of the main thread is a significant \
+             cross-platform compatibility hazard. If you really, absolutely need to create an \
+             EventLoop on a different thread, please use the `EventLoopExtUnix::{}` function.",
+            suggested_method
+        );
+    }
+}
+
+#[cfg(target_os = "linux")]
+fn is_main_thread() -> bool {
+    use libc::{c_long, getpid, syscall, SYS_gettid};
+
+    unsafe { syscall(SYS_gettid) == getpid() as c_long }
+}
+
+#[cfg(any(target_os = "dragonfly", target_os = "freebsd", target_os = "openbsd"))]
+fn is_main_thread() -> bool {
+    use libc::pthread_main_np;
+
+    unsafe { pthread_main_np() == 1 }
+}
+
+#[cfg(target_os = "netbsd")]
+fn is_main_thread() -> bool {
+    use libc::_lwp_self;
+
+    unsafe { _lwp_self() == 1 }
+}
--- a/src/platform_impl/linux/wayland/event_loop.rs
+++ b/src/platform_impl/linux/wayland/event_loop.rs
@@ -7,11 +7,19 @@ use std::{
    time::Instant,
 };

+use smithay_client_toolkit::reexports::protocols::unstable::pointer_constraints::v1::client::{
+    zwp_locked_pointer_v1::ZwpLockedPointerV1, zwp_pointer_constraints_v1::ZwpPointerConstraintsV1,
+};
 use smithay_client_toolkit::reexports::protocols::unstable::relative_pointer::v1::client::{
    zwp_relative_pointer_manager_v1::ZwpRelativePointerManagerV1,
    zwp_relative_pointer_v1::ZwpRelativePointerV1,
 };

+use smithay_client_toolkit::pointer::{AutoPointer, AutoThemer};
+use smithay_client_toolkit::reexports::client::protocol::{
+    wl_compositor::WlCompositor, wl_shm::WlShm, wl_surface::WlSurface,
+};
+
 use crate::{
    dpi::{PhysicalPosition, PhysicalSize},
    event::ModifiersState,
@@ -21,6 +29,7 @@ use crate::{
        sticky_exit_callback, MonitorHandle as PlatformMonitorHandle,
        VideoMode as PlatformVideoMode,
    },
+    window::CursorIcon,
 };

 use super::{window::WindowStore, DeviceId, WindowId};
@@ -45,6 +54,10 @@ impl<T> WindowEventsSink<T> {
        }
    }

+    pub fn send_event(&mut self, evt: crate::event::Event<T>) {
+        self.buffer.push_back(evt);
+    }
+
    pub fn send_window_event(&mut self, evt: crate::event::WindowEvent, wid: WindowId) {
        self.buffer.push_back(crate::event::Event::WindowEvent {
            event: evt,
@@ -69,21 +82,169 @@ impl<T> WindowEventsSink<T> {
    }
 }

+pub struct CursorManager {
+    pointer_constraints_proxy: Arc<Mutex<Option<ZwpPointerConstraintsV1>>>,
+    auto_themer: Option<AutoThemer>,
+    pointers: Vec<AutoPointer>,
+    locked_pointers: Vec<ZwpLockedPointerV1>,
+    cursor_visible: bool,
+    current_cursor: CursorIcon,
+}
+
+impl CursorManager {
+    fn new(constraints: Arc<Mutex<Option<ZwpPointerConstraintsV1>>>) -> CursorManager {
+        CursorManager {
+            pointer_constraints_proxy: constraints,
+            auto_themer: None,
+            pointers: Vec::new(),
+            locked_pointers: Vec::new(),
+            cursor_visible: true,
+            current_cursor: CursorIcon::default(),
+        }
+    }
+
+    fn register_pointer(&mut self, pointer: wl_pointer::WlPointer) {
+        let auto_themer = self
+            .auto_themer
+            .as_ref()
+            .expect("AutoThemer not initialized. Server did not advertise shm or compositor?");
+        self.pointers.push(auto_themer.theme_pointer(pointer));
+    }
+
+    fn set_auto_themer(&mut self, auto_themer: AutoThemer) {
+        self.auto_themer = Some(auto_themer);
+    }
+
+    pub fn set_cursor_visible(&mut self, visible: bool) {
+        if !visible {
+            for pointer in self.pointers.iter() {
+                (**pointer).set_cursor(0, None, 0, 0);
+            }
+        } else {
+            self.set_cursor_icon_impl(self.current_cursor);
+        }
+        self.cursor_visible = visible;
+    }
+
+    /// A helper function to restore cursor styles on PtrEvent::Enter.
+    pub fn reload_cursor_style(&mut self) {
+        if !self.cursor_visible {
+            self.set_cursor_visible(false);
+        } else {
+            self.set_cursor_icon_impl(self.current_cursor);
+        }
+    }
+
+    pub fn set_cursor_icon(&mut self, cursor: CursorIcon) {
+        if cursor != self.current_cursor {
+            self.current_cursor = cursor;
+            if self.cursor_visible {
+                self.set_cursor_icon_impl(cursor);
+            }
+        }
+    }
+
+    fn set_cursor_icon_impl(&mut self, cursor: CursorIcon) {
+        let cursor = match cursor {
+            CursorIcon::Alias => "link",
+            CursorIcon::Arrow => "arrow",
+            CursorIcon::Cell => "plus",
+            CursorIcon::Copy => "copy",
+            CursorIcon::Crosshair => "crosshair",
+            CursorIcon::Default => "left_ptr",
+            CursorIcon::Hand => "hand",
+            CursorIcon::Help => "question_arrow",
+            CursorIcon::Move => "move",
+            CursorIcon::Grab => "grab",
+            CursorIcon::Grabbing => "grabbing",
+            CursorIcon::Progress => "progress",
+            CursorIcon::AllScroll => "all-scroll",
+            CursorIcon::ContextMenu => "context-menu",
+
+            CursorIcon::NoDrop => "no-drop",
+            CursorIcon::NotAllowed => "crossed_circle",
+
+            // Resize cursors
+            CursorIcon::EResize => "right_side",
+            CursorIcon::NResize => "top_side",
+            CursorIcon::NeResize => "top_right_corner",
+            CursorIcon::NwResize => "top_left_corner",
+            CursorIcon::SResize => "bottom_side",
+            CursorIcon::SeResize => "bottom_right_corner",
+            CursorIcon::SwResize => "bottom_left_corner",
+            CursorIcon::WResize => "left_side",
+            CursorIcon::EwResize => "h_double_arrow",
+            CursorIcon::NsResize => "v_double_arrow",
+            CursorIcon::NwseResize => "bd_double_arrow",
+            CursorIcon::NeswResize => "fd_double_arrow",
+            CursorIcon::ColResize => "h_double_arrow",
+            CursorIcon::RowResize => "v_double_arrow",
+
+            CursorIcon::Text => "text",
+            CursorIcon::VerticalText => "vertical-text",
+
+            CursorIcon::Wait => "watch",
+
+            CursorIcon::ZoomIn => "zoom-in",
+            CursorIcon::ZoomOut => "zoom-out",
+        };
+
+        for pointer in self.pointers.iter() {
+            // Ignore erros, since we don't want to fail hard in case we can't find a proper cursor
+            // in a given theme.
+            let _ = pointer.set_cursor(cursor, None);
+        }
+    }
+
+    // This function can only be called from a thread on which `pointer_constraints_proxy` event
+    // queue is located, so calling it directly from a Window doesn't work well, in case
+    // you've sent your window to another thread, so we need to pass cursor grab updates to
+    // the event loop and call this function from there.
+    fn grab_pointer(&mut self, surface: Option<&WlSurface>) {
+        for locked_pointer in self.locked_pointers.drain(..) {
+            locked_pointer.destroy();
+        }
+
+        if let Some(surface) = surface {
+            for pointer in self.pointers.iter() {
+                let locked_pointer = self
+                    .pointer_constraints_proxy
+                    .try_lock()
+                    .unwrap()
+                    .as_ref()
+                    .and_then(|pointer_constraints| {
+                        super::pointer::implement_locked_pointer(
+                            surface,
+                            &**pointer,
+                            pointer_constraints,
+                        )
+                        .ok()
+                    });
+
+                if let Some(locked_pointer) = locked_pointer {
+                    self.locked_pointers.push(locked_pointer);
+                }
+            }
+        }
+    }
+}
+
 pub struct EventLoop<T: 'static> {
    // The loop
    inner_loop: ::calloop::EventLoop<()>,
    // The wayland display
    pub display: Arc<Display>,
-    // the output manager
+    // The output manager
    pub outputs: OutputMgr,
-    // our sink, shared with some handlers, buffering the events
+    // Our sink, shared with some handlers, buffering the events
    sink: Arc<Mutex<WindowEventsSink<T>>>,
    pending_user_events: Rc<RefCell<VecDeque<T>>>,
+    // The cursor manager
+    cursor_manager: Arc<Mutex<CursorManager>>,
+    // Utility for grabbing the cursor and changing visibility
    _user_source: ::calloop::Source<::calloop::channel::Channel<T>>,
    user_sender: ::calloop::channel::Sender<T>,
-    _kbd_source: ::calloop::Source<
-        ::calloop::channel::Channel<(crate::event::WindowEvent, super::WindowId)>,
-    >,
+    _kbd_source: ::calloop::Source<::calloop::channel::Channel<crate::event::Event<()>>>,
    window_target: RootELW<T>,
 }

@@ -91,17 +252,19 @@ pub struct EventLoop<T: 'static> {
 //
 // We should only try and wake up the `EventLoop` if it still exists, so we hold Weak ptrs.
 pub struct EventLoopProxy<T: 'static> {
-    user_sender: ::calloop::channel::Sender<T>,
+    user_sender: calloop::channel::Sender<T>,
 }

 pub struct EventLoopWindowTarget<T> {
-    // the event queue
+    // The event queue
    pub evq: RefCell<::calloop::Source<EventQueue>>,
    // The window store
    pub store: Arc<Mutex<WindowStore>>,
-    // the env
+    // The cursor manager
+    pub cursor_manager: Arc<Mutex<CursorManager>>,
+    // The env
    pub env: Environment,
-    // a cleanup switch to prune dead windows
+    // A cleanup switch to prune dead windows
    pub cleanup_needed: Arc<Mutex<bool>>,
    // The wayland display
    pub display: Arc<Display>,
@@ -119,8 +282,14 @@ impl<T: 'static> Clone for EventLoopProxy<T> {
 }

 impl<T: 'static> EventLoopProxy<T> {
-    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed> {
-        self.user_sender.send(event).map_err(|_| EventLoopClosed)
+    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
+        self.user_sender.send(event).map_err(|e| {
+            EventLoopClosed(if let ::calloop::channel::SendError::Disconnected(x) = e {
+                x
+            } else {
+                unreachable!()
+            })
+        })
    }
 }

@@ -135,25 +304,36 @@ impl<T: 'static> EventLoop<T> {

        let inner_loop = ::calloop::EventLoop::new().unwrap();

-        let (kbd_sender, kbd_channel) = ::calloop::channel::channel();
+        let (kbd_sender, kbd_channel) = ::calloop::channel::channel::<crate::event::Event<()>>();
        let kbd_sink = sink.clone();
        let kbd_source = inner_loop
            .handle()
            .insert_source(kbd_channel, move |evt, &mut ()| {
-                if let ::calloop::channel::Event::Msg((evt, wid)) = evt {
-                    kbd_sink.lock().unwrap().send_window_event(evt, wid);
+                if let ::calloop::channel::Event::Msg(evt) = evt {
+                    let evt = evt.map_nonuser_event().ok().unwrap();
+                    kbd_sink.lock().unwrap().send_event(evt);
                }
            })
            .unwrap();

+        let pointer_constraints_proxy = Arc::new(Mutex::new(None));
+
        let mut seat_manager = SeatManager {
            sink: sink.clone(),
-            relative_pointer_manager_proxy: None,
+            relative_pointer_manager_proxy: Rc::new(RefCell::new(None)),
+            pointer_constraints_proxy: pointer_constraints_proxy.clone(),
            store: store.clone(),
            seats: seats.clone(),
            kbd_sender,
+            cursor_manager: Arc::new(Mutex::new(CursorManager::new(pointer_constraints_proxy))),
        };

+        let cursor_manager = seat_manager.cursor_manager.clone();
+        let cursor_manager_clone = cursor_manager.clone();
+
+        let shm_cell = Rc::new(RefCell::new(None));
+        let compositor_cell = Rc::new(RefCell::new(None));
+
        let env = Environment::from_display_with_cb(
            &display,
            &mut event_queue,
@@ -164,14 +344,53 @@ impl<T: 'static> EventLoop<T> {
                    version,
                } => {
                    if interface == "zwp_relative_pointer_manager_v1" {
-                        seat_manager.relative_pointer_manager_proxy = Some(
-                            registry
-                                .bind(version, id, move |pointer_manager| {
-                                    pointer_manager.implement_closure(|_, _| (), ())
-                                })
-                                .unwrap(),
-                        )
+                        let relative_pointer_manager_proxy = registry
+                            .bind(version, id, move |pointer_manager| {
+                                pointer_manager.implement_closure(|_, _| (), ())
+                            })
+                            .unwrap();
+
+                        *seat_manager
+                            .relative_pointer_manager_proxy
+                            .try_borrow_mut()
+                            .unwrap() = Some(relative_pointer_manager_proxy);
                    }
+                    if interface == "zwp_pointer_constraints_v1" {
+                        let pointer_constraints_proxy = registry
+                            .bind(version, id, move |pointer_constraints| {
+                                pointer_constraints.implement_closure(|_, _| (), ())
+                            })
+                            .unwrap();
+
+                        *seat_manager.pointer_constraints_proxy.lock().unwrap() =
+                            Some(pointer_constraints_proxy);
+                    }
+                    if interface == "wl_shm" {
+                        let shm: WlShm = registry
+                            .bind(version, id, move |shm| shm.implement_closure(|_, _| (), ()))
+                            .unwrap();
+
+                        (*shm_cell.borrow_mut()) = Some(shm);
+                    }
+                    if interface == "wl_compositor" {
+                        let compositor: WlCompositor = registry
+                            .bind(version, id, move |compositor| {
+                                compositor.implement_closure(|_, _| (), ())
+                            })
+                            .unwrap();
+                        (*compositor_cell.borrow_mut()) = Some(compositor);
+                    }
+
+                    if compositor_cell.borrow().is_some() && shm_cell.borrow().is_some() {
+                        let compositor = compositor_cell.borrow_mut().take().unwrap();
+                        let shm = shm_cell.borrow_mut().take().unwrap();
+                        let auto_themer = AutoThemer::init(None, compositor, &shm);
+                        cursor_manager_clone
+                            .lock()
+                            .unwrap()
+                            .set_auto_themer(auto_themer);
+                    }
+
                    if interface == "wl_seat" {
                        seat_manager.add_seat(id, version, registry)
                    }
@@ -204,6 +423,7 @@ impl<T: 'static> EventLoop<T> {
            })
            .unwrap();

+        let cursor_manager_clone = cursor_manager.clone();
        Ok(EventLoop {
            inner_loop,
            sink,
@@ -212,12 +432,14 @@ impl<T: 'static> EventLoop<T> {
            outputs: env.outputs.clone(),
            _user_source: user_source,
            user_sender,
+            cursor_manager,
            _kbd_source: kbd_source,
            window_target: RootELW {
                p: crate::platform_impl::EventLoopWindowTarget::Wayland(EventLoopWindowTarget {
                    evq: RefCell::new(source),
                    store,
                    env,
+                    cursor_manager: cursor_manager_clone,
                    cleanup_needed: Arc::new(Mutex::new(false)),
                    seats,
                    display,
@@ -239,7 +461,7 @@ impl<T: 'static> EventLoop<T> {
        F: 'static + FnMut(crate::event::Event<T>, &RootELW<T>, &mut ControlFlow),
    {
        self.run_return(callback);
-        ::std::process::exit(0);
+        std::process::exit(0);
    }

    pub fn run_return<F>(&mut self, mut callback: F)
@@ -314,6 +536,25 @@ impl<T: 'static> EventLoop<T> {
            // send pending events to the server
            self.display.flush().expect("Wayland connection lost.");

+            // During the run of the user callback, some other code monitoring and reading the
+            // wayland socket may have been run (mesa for example does this with vsync), if that
+            // is the case, some events may have been enqueued in our event queue.
+            //
+            // If some messages are there, the event loop needs to behave as if it was instantly
+            // woken up by messages arriving from the wayland socket, to avoid getting stuck.
+            let instant_wakeup = {
+                let window_target = match self.window_target.p {
+                    crate::platform_impl::EventLoopWindowTarget::Wayland(ref wt) => wt,
+                    _ => unreachable!(),
+                };
+                let dispatched = window_target
+                    .evq
+                    .borrow_mut()
+                    .dispatch_pending()
+                    .expect("Wayland connection lost.");
+                dispatched > 0
+            };
+
            match control_flow {
                ControlFlow::Exit => break,
                ControlFlow::Poll => {
@@ -328,7 +569,12 @@ impl<T: 'static> EventLoop<T> {
                    );
                }
                ControlFlow::Wait => {
-                    self.inner_loop.dispatch(None, &mut ()).unwrap();
+                    let timeout = if instant_wakeup {
+                        Some(::std::time::Duration::from_millis(0))
+                    } else {
+                        None
+                    };
+                    self.inner_loop.dispatch(timeout, &mut ()).unwrap();
                    callback(
                        crate::event::Event::NewEvents(crate::event::StartCause::WaitCancelled {
                            start: Instant::now(),
@@ -341,7 +587,7 @@ impl<T: 'static> EventLoop<T> {
                ControlFlow::WaitUntil(deadline) => {
                    let start = Instant::now();
                    // compute the blocking duration
-                    let duration = if deadline > start {
+                    let duration = if deadline > start && !instant_wakeup {
                        deadline - start
                    } else {
                        ::std::time::Duration::from_millis(0)
@@ -424,39 +670,53 @@ impl<T> EventLoop<T> {
            }
        }
        // process pending resize/refresh
-        window_target.store.lock().unwrap().for_each(
-            |newsize, size, new_dpi, refresh, frame_refresh, closed, wid, frame| {
-                if let Some(frame) = frame {
-                    if let Some((w, h)) = newsize {
+        window_target.store.lock().unwrap().for_each(|window| {
+            if let Some(frame) = window.frame {
+                if let Some(newsize) = window.newsize {
+                    // Drop resize events equaled to the current size
+                    if newsize != *window.size {
+                        let (w, h) = newsize;
                        frame.resize(w, h);
                        frame.refresh();
                        let logical_size = crate::dpi::LogicalSize::new(w as f64, h as f64);
                        sink.send_window_event(
                            crate::event::WindowEvent::Resized(logical_size),
-                            wid,
+                            window.wid,
                        );
-                        *size = (w, h);
-                    } else if frame_refresh {
+                        *window.size = (w, h);
+                    } else {
+                        // Refresh csd, etc, otherwise
                        frame.refresh();
-                        if !refresh {
-                            frame.surface().commit()
-                        }
+                    }
+                } else if window.frame_refresh {
+                    frame.refresh();
+                    if !window.refresh {
+                        frame.surface().commit()
                    }
                }
-                if let Some(dpi) = new_dpi {
-                    sink.send_window_event(
-                        crate::event::WindowEvent::HiDpiFactorChanged(dpi as f64),
-                        wid,
-                    );
-                }
-                if refresh {
-                    sink.send_window_event(crate::event::WindowEvent::RedrawRequested, wid);
-                }
-                if closed {
-                    sink.send_window_event(crate::event::WindowEvent::CloseRequested, wid);
-                }
-            },
-        )
+            }
+            if let Some(dpi) = window.new_dpi {
+                sink.send_window_event(
+                    crate::event::WindowEvent::HiDpiFactorChanged(dpi as f64),
+                    window.wid,
+                );
+            }
+            if window.refresh {
+                sink.send_window_event(crate::event::WindowEvent::RedrawRequested, window.wid);
+            }
+            if window.closed {
+                sink.send_window_event(crate::event::WindowEvent::CloseRequested, window.wid);
+            }
+
+            if let Some(grab_cursor) = window.grab_cursor {
+                let surface = if grab_cursor {
+                    Some(window.surface)
+                } else {
+                    None
+                };
+                self.cursor_manager.lock().unwrap().grab_pointer(surface);
+            }
+        })
    }
 }

@@ -468,8 +728,10 @@ struct SeatManager<T: 'static> {
    sink: Arc<Mutex<WindowEventsSink<T>>>,
    store: Arc<Mutex<WindowStore>>,
    seats: Arc<Mutex<Vec<(u32, wl_seat::WlSeat)>>>,
-    kbd_sender: ::calloop::channel::Sender<(crate::event::WindowEvent, super::WindowId)>,
-    relative_pointer_manager_proxy: Option<ZwpRelativePointerManagerV1>,
+    kbd_sender: ::calloop::channel::Sender<crate::event::Event<()>>,
+    relative_pointer_manager_proxy: Rc<RefCell<Option<ZwpRelativePointerManagerV1>>>,
+    pointer_constraints_proxy: Arc<Mutex<Option<ZwpPointerConstraintsV1>>>,
+    cursor_manager: Arc<Mutex<CursorManager>>,
 }

 impl<T: 'static> SeatManager<T> {
@@ -481,11 +743,12 @@ impl<T: 'static> SeatManager<T> {
            store: self.store.clone(),
            pointer: None,
            relative_pointer: None,
-            relative_pointer_manager_proxy: self.relative_pointer_manager_proxy.as_ref().cloned(),
+            relative_pointer_manager_proxy: self.relative_pointer_manager_proxy.clone(),
            keyboard: None,
            touch: None,
            kbd_sender: self.kbd_sender.clone(),
            modifiers_tracker: Arc::new(Mutex::new(ModifiersState::default())),
+            cursor_manager: self.cursor_manager.clone(),
        };
        let seat = registry
            .bind(min(version, 5), id, move |seat| {
@@ -510,13 +773,14 @@ impl<T: 'static> SeatManager<T> {
 struct SeatData<T> {
    sink: Arc<Mutex<WindowEventsSink<T>>>,
    store: Arc<Mutex<WindowStore>>,
-    kbd_sender: ::calloop::channel::Sender<(crate::event::WindowEvent, super::WindowId)>,
+    kbd_sender: ::calloop::channel::Sender<crate::event::Event<()>>,
    pointer: Option<wl_pointer::WlPointer>,
    relative_pointer: Option<ZwpRelativePointerV1>,
-    relative_pointer_manager_proxy: Option<ZwpRelativePointerManagerV1>,
+    relative_pointer_manager_proxy: Rc<RefCell<Option<ZwpRelativePointerManagerV1>>>,
    keyboard: Option<wl_keyboard::WlKeyboard>,
    touch: Option<wl_touch::WlTouch>,
    modifiers_tracker: Arc<Mutex<ModifiersState>>,
+    cursor_manager: Arc<Mutex<CursorManager>>,
 }

 impl<T: 'static> SeatData<T> {
@@ -531,19 +795,27 @@ impl<T: 'static> SeatData<T> {
                        self.sink.clone(),
                        self.store.clone(),
                        self.modifiers_tracker.clone(),
+                        self.cursor_manager.clone(),
                    ));

-                    self.relative_pointer =
-                        self.relative_pointer_manager_proxy
-                            .as_ref()
-                            .and_then(|manager| {
-                                super::pointer::implement_relative_pointer(
-                                    self.sink.clone(),
-                                    self.pointer.as_ref().unwrap(),
-                                    manager,
-                                )
-                                .ok()
-                            })
+                    self.cursor_manager
+                        .lock()
+                        .unwrap()
+                        .register_pointer(self.pointer.as_ref().unwrap().clone());
+
+                    self.relative_pointer = self
+                        .relative_pointer_manager_proxy
+                        .try_borrow()
+                        .unwrap()
+                        .as_ref()
+                        .and_then(|manager| {
+                            super::pointer::implement_relative_pointer(
+                                self.sink.clone(),
+                                self.pointer.as_ref().unwrap(),
+                                manager,
+                            )
+                            .ok()
+                        })
                }
                // destroy pointer if applicable
                if !capabilities.contains(wl_seat::Capability::Pointer) {
--- a/src/platform_impl/linux/wayland/keyboard.rs
+++ b/src/platform_impl/linux/wayland/keyboard.rs
@@ -8,11 +8,13 @@ use smithay_client_toolkit::{
    reexports::client::protocol::{wl_keyboard, wl_seat},
 };

-use crate::event::{ElementState, KeyboardInput, ModifiersState, VirtualKeyCode, WindowEvent};
+use crate::event::{
+    DeviceEvent, ElementState, Event, KeyboardInput, ModifiersState, VirtualKeyCode, WindowEvent,
+};

 pub fn init_keyboard(
    seat: &wl_seat::WlSeat,
-    sink: ::calloop::channel::Sender<(crate::event::WindowEvent, super::WindowId)>,
+    sink: ::calloop::channel::Sender<crate::event::Event<()>>,
    modifiers_tracker: Arc<Mutex<ModifiersState>>,
 ) -> wl_keyboard::WlKeyboard {
    // { variables to be captured by the closures
@@ -29,12 +31,22 @@ pub fn init_keyboard(
            match evt {
                KbEvent::Enter { surface, .. } => {
                    let wid = make_wid(&surface);
-                    my_sink.send((WindowEvent::Focused(true), wid)).unwrap();
+                    my_sink
+                        .send(Event::WindowEvent {
+                            window_id: mk_root_wid(wid),
+                            event: WindowEvent::Focused(true),
+                        })
+                        .unwrap();
                    *target.lock().unwrap() = Some(wid);
                }
                KbEvent::Leave { surface, .. } => {
                    let wid = make_wid(&surface);
-                    my_sink.send((WindowEvent::Focused(false), wid)).unwrap();
+                    my_sink
+                        .send(Event::WindowEvent {
+                            window_id: mk_root_wid(wid),
+                            event: WindowEvent::Focused(false),
+                        })
+                        .unwrap();
                    *target.lock().unwrap() = None;
                }
                KbEvent::Key {
@@ -52,20 +64,19 @@ pub fn init_keyboard(
                        };
                        let vkcode = key_to_vkey(rawkey, keysym);
                        my_sink
-                            .send((
-                                WindowEvent::KeyboardInput {
-                                    device_id: crate::event::DeviceId(
-                                        crate::platform_impl::DeviceId::Wayland(DeviceId),
-                                    ),
+                            .send(Event::WindowEvent {
+                                window_id: mk_root_wid(wid),
+                                event: WindowEvent::KeyboardInput {
+                                    device_id: device_id(),
                                    input: KeyboardInput {
                                        state,
                                        scancode: rawkey,
                                        virtual_keycode: vkcode,
                                        modifiers: modifiers_tracker.lock().unwrap().clone(),
                                    },
+                                    is_synthetic: false,
                                },
-                                wid,
-                            ))
+                            })
                            .unwrap();
                        // send char event only on key press, not release
                        if let ElementState::Released = state {
@@ -74,7 +85,10 @@ pub fn init_keyboard(
                        if let Some(txt) = utf8 {
                            for chr in txt.chars() {
                                my_sink
-                                    .send((WindowEvent::ReceivedCharacter(chr), wid))
+                                    .send(Event::WindowEvent {
+                                        window_id: mk_root_wid(wid),
+                                        event: WindowEvent::ReceivedCharacter(chr),
+                                    })
                                    .unwrap();
                            }
                        }
@@ -83,7 +97,18 @@ pub fn init_keyboard(
                KbEvent::RepeatInfo { .. } => { /* Handled by smithay client toolkit */ }
                KbEvent::Modifiers {
                    modifiers: event_modifiers,
-                } => *modifiers_tracker.lock().unwrap() = event_modifiers.into(),
+                } => {
+                    let modifiers = ModifiersState::from_wayland(event_modifiers);
+
+                    *modifiers_tracker.lock().unwrap() = modifiers;
+
+                    my_sink
+                        .send(Event::DeviceEvent {
+                            device_id: device_id(),
+                            event: DeviceEvent::ModifiersChanged { modifiers },
+                        })
+                        .unwrap();
+                }
            }
        },
        move |repeat_event: KeyRepeatEvent, _| {
@@ -91,25 +116,27 @@ pub fn init_keyboard(
                let state = ElementState::Pressed;
                let vkcode = key_to_vkey(repeat_event.rawkey, repeat_event.keysym);
                repeat_sink
-                    .send((
-                        WindowEvent::KeyboardInput {
-                            device_id: crate::event::DeviceId(
-                                crate::platform_impl::DeviceId::Wayland(DeviceId),
-                            ),
+                    .send(Event::WindowEvent {
+                        window_id: mk_root_wid(wid),
+                        event: WindowEvent::KeyboardInput {
+                            device_id: device_id(),
                            input: KeyboardInput {
                                state,
                                scancode: repeat_event.rawkey,
                                virtual_keycode: vkcode,
                                modifiers: my_modifiers.lock().unwrap().clone(),
                            },
+                            is_synthetic: false,
                        },
-                        wid,
-                    ))
+                    })
                    .unwrap();
                if let Some(txt) = repeat_event.utf8 {
                    for chr in txt.chars() {
                        repeat_sink
-                            .send((WindowEvent::ReceivedCharacter(chr), wid))
+                            .send(Event::WindowEvent {
+                                window_id: mk_root_wid(wid),
+                                event: WindowEvent::ReceivedCharacter(chr),
+                            })
                            .unwrap();
                    }
                }
@@ -137,12 +164,22 @@ pub fn init_keyboard(
                    move |evt, _| match evt {
                        wl_keyboard::Event::Enter { surface, .. } => {
                            let wid = make_wid(&surface);
-                            my_sink.send((WindowEvent::Focused(true), wid)).unwrap();
+                            my_sink
+                                .send(Event::WindowEvent {
+                                    window_id: mk_root_wid(wid),
+                                    event: WindowEvent::Focused(true),
+                                })
+                                .unwrap();
                            target = Some(wid);
                        }
                        wl_keyboard::Event::Leave { surface, .. } => {
                            let wid = make_wid(&surface);
-                            my_sink.send((WindowEvent::Focused(false), wid)).unwrap();
+                            my_sink
+                                .send(Event::WindowEvent {
+                                    window_id: mk_root_wid(wid),
+                                    event: WindowEvent::Focused(false),
+                                })
+                                .unwrap();
                            target = None;
                        }
                        wl_keyboard::Event::Key { key, state, .. } => {
@@ -153,20 +190,19 @@ pub fn init_keyboard(
                                    _ => unreachable!(),
                                };
                                my_sink
-                                    .send((
-                                        WindowEvent::KeyboardInput {
-                                            device_id: crate::event::DeviceId(
-                                                crate::platform_impl::DeviceId::Wayland(DeviceId),
-                                            ),
+                                    .send(Event::WindowEvent {
+                                        window_id: mk_root_wid(wid),
+                                        event: WindowEvent::KeyboardInput {
+                                            device_id: device_id(),
                                            input: KeyboardInput {
                                                state,
                                                scancode: key,
                                                virtual_keycode: None,
                                                modifiers: ModifiersState::default(),
                                            },
+                                            is_synthetic: false,
                                        },
-                                        wid,
-                                    ))
+                                    })
                                    .unwrap();
                            }
                        }
@@ -366,8 +402,8 @@ fn keysym_to_vkey(keysym: u32) -> Option<VirtualKeyCode> {
    }
 }

-impl From<keyboard::ModifiersState> for ModifiersState {
-    fn from(mods: keyboard::ModifiersState) -> ModifiersState {
+impl ModifiersState {
+    pub(crate) fn from_wayland(mods: keyboard::ModifiersState) -> ModifiersState {
        ModifiersState {
            shift: mods.shift,
            ctrl: mods.ctrl,
@@ -376,3 +412,11 @@ impl From<keyboard::ModifiersState> for ModifiersState {
        }
    }
 }
+
+fn device_id() -> crate::event::DeviceId {
+    crate::event::DeviceId(crate::platform_impl::DeviceId::Wayland(DeviceId))
+}
+
+fn mk_root_wid(wid: crate::platform_impl::wayland::WindowId) -> crate::window::WindowId {
+    crate::window::WindowId(crate::platform_impl::WindowId::Wayland(wid))
+}
--- a/src/platform_impl/linux/wayland/pointer.rs
+++ b/src/platform_impl/linux/wayland/pointer.rs
@@ -5,7 +5,11 @@ use crate::event::{
    WindowEvent,
 };

-use super::{event_loop::WindowEventsSink, window::WindowStore, DeviceId};
+use super::{
+    event_loop::{CursorManager, WindowEventsSink},
+    window::WindowStore,
+    DeviceId,
+};

 use smithay_client_toolkit::reexports::client::protocol::{
    wl_pointer::{self, Event as PtrEvent, WlPointer},
@@ -17,11 +21,19 @@ use smithay_client_toolkit::reexports::protocols::unstable::relative_pointer::v1
    zwp_relative_pointer_v1::ZwpRelativePointerV1,
 };

+use smithay_client_toolkit::reexports::protocols::unstable::pointer_constraints::v1::client::{
+    zwp_locked_pointer_v1::ZwpLockedPointerV1, zwp_pointer_constraints_v1::Lifetime,
+    zwp_pointer_constraints_v1::ZwpPointerConstraintsV1,
+};
+
+use smithay_client_toolkit::reexports::client::protocol::wl_surface::WlSurface;
+
 pub fn implement_pointer<T: 'static>(
    seat: &wl_seat::WlSeat,
    sink: Arc<Mutex<WindowEventsSink<T>>>,
    store: Arc<Mutex<WindowStore>>,
    modifiers_tracker: Arc<Mutex<ModifiersState>>,
+    cursor_manager: Arc<Mutex<CursorManager>>,
 ) -> WlPointer {
    seat.get_pointer(|pointer| {
        let mut mouse_focus = None;
@@ -33,6 +45,7 @@ pub fn implement_pointer<T: 'static>(
            move |evt, pointer| {
                let mut sink = sink.lock().unwrap();
                let store = store.lock().unwrap();
+                let mut cursor_manager = cursor_manager.lock().unwrap();
                match evt {
                    PtrEvent::Enter {
                        surface,
@@ -62,6 +75,8 @@ pub fn implement_pointer<T: 'static>(
                                wid,
                            );
                        }
+
+                        cursor_manager.reload_cursor_style();
                    }
                    PtrEvent::Leave { surface, .. } => {
                        mouse_focus = None;
@@ -241,3 +256,13 @@ pub fn implement_relative_pointer<T: 'static>(
        )
    })
 }
+
+pub fn implement_locked_pointer(
+    surface: &WlSurface,
+    pointer: &WlPointer,
+    constraints: &ZwpPointerConstraintsV1,
+) -> Result<ZwpLockedPointerV1, ()> {
+    constraints.lock_pointer(surface, pointer, None, Lifetime::Persistent.to_raw(), |c| {
+        c.implement_closure(|_, _| (), ())
+    })
+}
--- a/src/platform_impl/linux/wayland/window.rs
+++ b/src/platform_impl/linux/wayland/window.rs
@@ -1,6 +1,7 @@
 use raw_window_handle::unix::WaylandHandle;
 use std::{
    collections::VecDeque,
+    mem::replace,
    sync::{Arc, Mutex, Weak},
 };

@@ -26,11 +27,12 @@ use smithay_client_toolkit::{
    window::{ConceptFrame, Event as WEvent, State as WState, Theme, Window as SWindow},
 };

-use super::{make_wid, EventLoopWindowTarget, MonitorHandle, WindowId};
+use super::{event_loop::CursorManager, make_wid, EventLoopWindowTarget, MonitorHandle, WindowId};

 pub struct Window {
    surface: wl_surface::WlSurface,
    frame: Arc<Mutex<SWindow<ConceptFrame>>>,
+    cursor_manager: Arc<Mutex<CursorManager>>,
    outputs: OutputMgr, // Access to info for all monitors
    size: Arc<Mutex<(u32, u32)>>,
    kill_switch: (Arc<Mutex<bool>>, Arc<Mutex<bool>>),
@@ -38,6 +40,7 @@ pub struct Window {
    need_frame_refresh: Arc<Mutex<bool>>,
    need_refresh: Arc<Mutex<bool>>,
    fullscreen: Arc<Mutex<bool>>,
+    cursor_grab_changed: Arc<Mutex<Option<bool>>>, // Update grab state
 }

 impl Window {
@@ -52,6 +55,7 @@ impl Window {
        let fullscreen = Arc::new(Mutex::new(false));

        let window_store = evlp.store.clone();
+        let cursor_manager = evlp.cursor_manager.clone();
        let surface = evlp.env.create_surface(move |dpi, surface| {
            window_store.lock().unwrap().dpi_change(&surface, dpi);
            surface.set_buffer_scale(dpi);
@@ -140,6 +144,7 @@ impl Window {
        let need_frame_refresh = Arc::new(Mutex::new(true));
        let frame = Arc::new(Mutex::new(frame));
        let need_refresh = Arc::new(Mutex::new(true));
+        let cursor_grab_changed = Arc::new(Mutex::new(None));

        evlp.store.lock().unwrap().windows.push(InternalWindow {
            closed: false,
@@ -147,6 +152,7 @@ impl Window {
            size: size.clone(),
            need_refresh: need_refresh.clone(),
            fullscreen: fullscreen.clone(),
+            cursor_grab_changed: cursor_grab_changed.clone(),
            need_frame_refresh: need_frame_refresh.clone(),
            surface: surface.clone(),
            kill_switch: kill_switch.clone(),
@@ -165,7 +171,9 @@ impl Window {
            kill_switch: (kill_switch, evlp.cleanup_needed.clone()),
            need_frame_refresh,
            need_refresh,
+            cursor_manager,
            fullscreen,
+            cursor_grab_changed,
        })
    }

@@ -292,18 +300,21 @@ impl Window {
    }

    #[inline]
-    pub fn set_cursor_icon(&self, _cursor: CursorIcon) {
-        // TODO
+    pub fn set_cursor_icon(&self, cursor: CursorIcon) {
+        let mut cursor_manager = self.cursor_manager.lock().unwrap();
+        cursor_manager.set_cursor_icon(cursor);
    }

    #[inline]
-    pub fn set_cursor_visible(&self, _visible: bool) {
-        // TODO: This isn't possible on Wayland yet
+    pub fn set_cursor_visible(&self, visible: bool) {
+        let mut cursor_manager = self.cursor_manager.lock().unwrap();
+        cursor_manager.set_cursor_visible(visible);
    }

    #[inline]
-    pub fn set_cursor_grab(&self, _grab: bool) -> Result<(), ExternalError> {
-        Err(ExternalError::NotSupported(NotSupportedError::new()))
+    pub fn set_cursor_grab(&self, grab: bool) -> Result<(), ExternalError> {
+        *self.cursor_grab_changed.lock().unwrap() = Some(grab);
+        Ok(())
    }

    #[inline]
@@ -362,6 +373,7 @@ struct InternalWindow {
    need_refresh: Arc<Mutex<bool>>,
    fullscreen: Arc<Mutex<bool>>,
    need_frame_refresh: Arc<Mutex<bool>>,
+    cursor_grab_changed: Arc<Mutex<Option<bool>>>,
    closed: bool,
    kill_switch: Arc<Mutex<bool>>,
    frame: Weak<Mutex<SWindow<ConceptFrame>>>,
@@ -373,6 +385,19 @@ pub struct WindowStore {
    windows: Vec<InternalWindow>,
 }

+pub struct WindowStoreForEach<'a> {
+    pub newsize: Option<(u32, u32)>,
+    pub size: &'a mut (u32, u32),
+    pub new_dpi: Option<i32>,
+    pub refresh: bool,
+    pub frame_refresh: bool,
+    pub closed: bool,
+    pub grab_cursor: Option<bool>,
+    pub surface: &'a wl_surface::WlSurface,
+    pub wid: WindowId,
+    pub frame: Option<&'a mut SWindow<ConceptFrame>>,
+}
+
 impl WindowStore {
    pub fn new() -> WindowStore {
        WindowStore {
@@ -422,30 +447,23 @@ impl WindowStore {

    pub fn for_each<F>(&mut self, mut f: F)
    where
-        F: FnMut(
-            Option<(u32, u32)>,
-            &mut (u32, u32),
-            Option<i32>,
-            bool,
-            bool,
-            bool,
-            WindowId,
-            Option<&mut SWindow<ConceptFrame>>,
-        ),
+        F: FnMut(WindowStoreForEach<'_>),
    {
        for window in &mut self.windows {
            let opt_arc = window.frame.upgrade();
            let mut opt_mutex_lock = opt_arc.as_ref().map(|m| m.lock().unwrap());
-            f(
-                window.newsize.take(),
-                &mut *(window.size.lock().unwrap()),
-                window.new_dpi,
-                ::std::mem::replace(&mut *window.need_refresh.lock().unwrap(), false),
-                ::std::mem::replace(&mut *window.need_frame_refresh.lock().unwrap(), false),
-                window.closed,
-                make_wid(&window.surface),
-                opt_mutex_lock.as_mut().map(|m| &mut **m),
-            );
+            f(WindowStoreForEach {
+                newsize: window.newsize.take(),
+                size: &mut *(window.size.lock().unwrap()),
+                new_dpi: window.new_dpi,
+                refresh: replace(&mut *window.need_refresh.lock().unwrap(), false),
+                frame_refresh: replace(&mut *window.need_frame_refresh.lock().unwrap(), false),
+                closed: window.closed,
+                grab_cursor: window.cursor_grab_changed.lock().unwrap().take(),
+                surface: &window.surface,
+                wid: make_wid(&window.surface),
+                frame: opt_mutex_lock.as_mut().map(|m| &mut **m),
+            });
            if let Some(dpi) = window.new_dpi.take() {
                window.current_dpi = dpi;
            }
--- a/src/platform_impl/linux/x11/event_processor.rs
+++ b/src/platform_impl/linux/x11/event_processor.rs
@@ -1,4 +1,4 @@
-use std::{cell::RefCell, collections::HashMap, ptr, rc::Rc, slice};
+use std::{cell::RefCell, collections::HashMap, rc::Rc, slice};

 use libc::{c_char, c_int, c_long, c_uint, c_ulong};

@@ -8,9 +8,11 @@ use super::{
    XExtension,
 };

+use util::modifiers::{ModifierKeyState, ModifierKeymap};
+
 use crate::{
    dpi::{LogicalPosition, LogicalSize},
-    event::{DeviceEvent, Event, KeyboardInput, ModifiersState, WindowEvent},
+    event::{DeviceEvent, ElementState, Event, KeyboardInput, ModifiersState, WindowEvent},
    event_loop::EventLoopWindowTarget as RootELW,
 };

@@ -21,6 +23,8 @@ pub(super) struct EventProcessor<T: 'static> {
    pub(super) devices: RefCell<HashMap<DeviceId, Device>>,
    pub(super) xi2ext: XExtension,
    pub(super) target: Rc<RootELW<T>>,
+    pub(super) mod_keymap: ModifierKeymap,
+    pub(super) device_mod_state: ModifierKeyState,
 }

 impl<T: 'static> EventProcessor<T> {
@@ -62,6 +66,13 @@ impl<T: 'static> EventProcessor<T> {
        self.with_window(window_id, |_| ()).is_some()
    }

+    pub(super) fn poll(&self) -> bool {
+        let wt = get_xtarget(&self.target);
+        let result = unsafe { (wt.xconn.xlib.XPending)(wt.xconn.display) };
+
+        result != 0
+    }
+
    pub(super) unsafe fn poll_one_event(&mut self, event_ptr: *mut ffi::XEvent) -> bool {
        let wt = get_xtarget(&self.target);
        // This function is used to poll and remove a single event
@@ -109,15 +120,44 @@ impl<T: 'static> EventProcessor<T> {
            return;
        }

+        // We can't call a `&mut self` method because of the above borrow,
+        // so we use this macro for repeated modifier state updates.
+        macro_rules! update_modifiers {
+            ( $state:expr , $modifier:expr ) => {{
+                match ($state, $modifier) {
+                    (state, modifier) => {
+                        if let Some(modifiers) =
+                            self.device_mod_state.update_state(&state, modifier)
+                        {
+                            let device_id = mkdid(util::VIRTUAL_CORE_KEYBOARD);
+                            callback(Event::DeviceEvent {
+                                device_id,
+                                event: DeviceEvent::ModifiersChanged { modifiers },
+                            });
+                        }
+                    }
+                }
+            }};
+        }
+
        let event_type = xev.get_type();
        match event_type {
            ffi::MappingNotify => {
-                unsafe {
-                    (wt.xconn.xlib.XRefreshKeyboardMapping)(xev.as_mut());
+                let mapping: &ffi::XMappingEvent = xev.as_ref();
+
+                if mapping.request == ffi::MappingModifier
+                    || mapping.request == ffi::MappingKeyboard
+                {
+                    unsafe {
+                        (wt.xconn.xlib.XRefreshKeyboardMapping)(xev.as_mut());
+                    }
+                    wt.xconn
+                        .check_errors()
+                        .expect("Failed to call XRefreshKeyboardMapping");
+
+                    self.mod_keymap.reset_from_x_connection(&wt.xconn);
+                    self.device_mod_state.update_keymap(&self.mod_keymap);
                }
-                wt.xconn
-                    .check_errors()
-                    .expect("Failed to call XRefreshKeyboardMapping");
            }

            ffi::ClientMessage => {
@@ -362,20 +402,20 @@ impl<T: 'static> EventProcessor<T> {
                        let (width, height) = shared_state_lock
                            .dpi_adjusted
                            .unwrap_or_else(|| (xev.width as f64, xev.height as f64));
-                        let last_hidpi_factor =
-                            shared_state_lock.guessed_dpi.take().unwrap_or_else(|| {
-                                shared_state_lock
-                                    .last_monitor
-                                    .as_ref()
-                                    .map(|last_monitor| last_monitor.hidpi_factor)
-                                    .unwrap_or(1.0)
-                            });
+
+                        let last_hidpi_factor = shared_state_lock.last_monitor.hidpi_factor;
                        let new_hidpi_factor = {
                            let window_rect = util::AaRect::new(new_outer_position, new_inner_size);
-                            monitor = wt.xconn.get_monitor_for_window(Some(window_rect));
-                            let new_hidpi_factor = monitor.hidpi_factor;
-                            shared_state_lock.last_monitor = Some(monitor.clone());
-                            new_hidpi_factor
+                            let new_monitor = wt.xconn.get_monitor_for_window(Some(window_rect));
+
+                            if new_monitor.is_dummy() {
+                                // Avoid updating monitor using a dummy monitor handle
+                                last_hidpi_factor
+                            } else {
+                                monitor = new_monitor;
+                                shared_state_lock.last_monitor = monitor.clone();
+                                monitor.hidpi_factor
+                            }
                        };
                        if last_hidpi_factor != new_hidpi_factor {
                            events.dpi_changed =
@@ -479,6 +519,13 @@ impl<T: 'static> EventProcessor<T> {
                });
            }

+            ffi::VisibilityNotify => {
+                let xev: &ffi::XVisibilityEvent = xev.as_ref();
+                let xwindow = xev.window;
+
+                self.with_window(xwindow, |window| window.visibility_notify());
+            }
+
            ffi::Expose => {
                let xev: &ffi::XExposeEvent = xev.as_ref();

@@ -510,41 +557,33 @@ impl<T: 'static> EventProcessor<T> {
                // value, though this should only be an issue under multiseat configurations.
                let device = util::VIRTUAL_CORE_KEYBOARD;
                let device_id = mkdid(device);
+                let keycode = xkev.keycode;

                // When a compose sequence or IME pre-edit is finished, it ends in a KeyPress with
                // a keycode of 0.
-                if xkev.keycode != 0 {
-                    let modifiers = ModifiersState {
-                        alt: xkev.state & ffi::Mod1Mask != 0,
-                        shift: xkev.state & ffi::ShiftMask != 0,
-                        ctrl: xkev.state & ffi::ControlMask != 0,
-                        logo: xkev.state & ffi::Mod4Mask != 0,
-                    };
-
-                    let keysym = unsafe {
-                        let mut keysym = 0;
-                        (wt.xconn.xlib.XLookupString)(
-                            xkev,
-                            ptr::null_mut(),
-                            0,
-                            &mut keysym,
-                            ptr::null_mut(),
-                        );
-                        wt.xconn.check_errors().expect("Failed to lookup keysym");
-                        keysym
-                    };
+                if keycode != 0 {
+                    let scancode = keycode - 8;
+                    let keysym = wt.xconn.lookup_keysym(xkev);
                    let virtual_keycode = events::keysym_to_element(keysym as c_uint);

+                    update_modifiers!(
+                        ModifiersState::from_x11_mask(xkev.state),
+                        self.mod_keymap.get_modifier(xkev.keycode as ffi::KeyCode)
+                    );
+
+                    let modifiers = self.device_mod_state.modifiers();
+
                    callback(Event::WindowEvent {
                        window_id,
                        event: WindowEvent::KeyboardInput {
                            device_id,
                            input: KeyboardInput {
                                state,
-                                scancode: xkev.keycode - 8,
+                                scancode,
                                virtual_keycode,
                                modifiers,
                            },
+                            is_synthetic: false,
                        },
                    });
                }
@@ -598,7 +637,8 @@ impl<T: 'static> EventProcessor<T> {
                            return;
                        }

-                        let modifiers = ModifiersState::from(xev.mods);
+                        let modifiers = ModifiersState::from_x11(&xev.mods);
+                        update_modifiers!(modifiers, None);

                        let state = if xev.evtype == ffi::XI_ButtonPress {
                            Pressed
@@ -674,7 +714,8 @@ impl<T: 'static> EventProcessor<T> {
                        let window_id = mkwid(xev.event);
                        let new_cursor_pos = (xev.event_x, xev.event_y);

-                        let modifiers = ModifiersState::from(xev.mods);
+                        let modifiers = ModifiersState::from_x11(&xev.mods);
+                        update_modifiers!(modifiers, None);

                        let cursor_moved = self.with_window(xev.event, |window| {
                            let mut shared_state_lock = window.shared_state.lock();
@@ -859,6 +900,10 @@ impl<T: 'static> EventProcessor<T> {
                            event: Focused(true),
                        });

+                        let modifiers = ModifiersState::from_x11(&xev.mods);
+
+                        update_modifiers!(modifiers, None);
+
                        // The deviceid for this event is for a keyboard instead of a pointer,
                        // so we have to do a little extra work.
                        let pointer_id = self
@@ -877,9 +922,12 @@ impl<T: 'static> EventProcessor<T> {
                            event: CursorMoved {
                                device_id: mkdid(pointer_id),
                                position,
-                                modifiers: ModifiersState::from(xev.mods),
+                                modifiers,
                            },
                        });
+
+                        // Issue key press events for all pressed keys
+                        self.handle_pressed_keys(window_id, ElementState::Pressed, &mut callback);
                    }
                    ffi::XI_FocusOut => {
                        let xev: &ffi::XIFocusOutEvent = unsafe { &*(xev.data as *const _) };
@@ -890,8 +938,14 @@ impl<T: 'static> EventProcessor<T> {
                            .borrow_mut()
                            .unfocus(xev.event)
                            .expect("Failed to unfocus input context");
+
+                        let window_id = mkwid(xev.event);
+
+                        // Issue key release events for all pressed keys
+                        self.handle_pressed_keys(window_id, ElementState::Released, &mut callback);
+
                        callback(Event::WindowEvent {
-                            window_id: mkwid(xev.event),
+                            window_id,
                            event: Focused(false),
                        })
                    }
@@ -1002,40 +1056,46 @@ impl<T: 'static> EventProcessor<T> {
                            _ => unreachable!(),
                        };

-                        let device_id = xev.sourceid;
+                        let device_id = mkdid(xev.sourceid);
                        let keycode = xev.detail;
                        if keycode < 8 {
                            return;
                        }
                        let scancode = (keycode - 8) as u32;
-
-                        let keysym = unsafe {
-                            (wt.xconn.xlib.XKeycodeToKeysym)(
-                                wt.xconn.display,
-                                xev.detail as ffi::KeyCode,
-                                0,
-                            )
-                        };
-                        wt.xconn
-                            .check_errors()
-                            .expect("Failed to lookup raw keysym");
-
+                        let keysym = wt.xconn.keycode_to_keysym(keycode as ffi::KeyCode);
                        let virtual_keycode = events::keysym_to_element(keysym as c_uint);
+                        let modifiers = self.device_mod_state.modifiers();

                        callback(Event::DeviceEvent {
-                            device_id: mkdid(device_id),
+                            device_id,
                            event: DeviceEvent::Key(KeyboardInput {
                                scancode,
                                virtual_keycode,
                                state,
-                                // So, in an ideal world we can use libxkbcommon to get modifiers.
-                                // However, libxkbcommon-x11 isn't as commonly installed as one
-                                // would hope. We can still use the Xkb extension to get
-                                // comprehensive keyboard state updates, but interpreting that
-                                // info manually is going to be involved.
-                                modifiers: ModifiersState::default(),
+                                modifiers,
                            }),
                        });
+
+                        if let Some(modifier) =
+                            self.mod_keymap.get_modifier(keycode as ffi::KeyCode)
+                        {
+                            self.device_mod_state.key_event(
+                                state,
+                                keycode as ffi::KeyCode,
+                                modifier,
+                            );
+
+                            let new_modifiers = self.device_mod_state.modifiers();
+
+                            if modifiers != new_modifiers {
+                                callback(Event::DeviceEvent {
+                                    device_id,
+                                    event: DeviceEvent::ModifiersChanged {
+                                        modifiers: new_modifiers,
+                                    },
+                                });
+                            }
+                        }
                    }

                    ffi::XI_HierarchyChanged => {
@@ -1114,4 +1174,45 @@ impl<T: 'static> EventProcessor<T> {
            Err(_) => (),
        }
    }
+
+    fn handle_pressed_keys<F>(
+        &self,
+        window_id: crate::window::WindowId,
+        state: ElementState,
+        callback: &mut F,
+    ) where
+        F: FnMut(Event<T>),
+    {
+        let wt = get_xtarget(&self.target);
+
+        let device_id = mkdid(util::VIRTUAL_CORE_KEYBOARD);
+        let modifiers = self.device_mod_state.modifiers();
+
+        // Get the set of keys currently pressed and apply Key events to each
+        let keys = wt.xconn.query_keymap();
+
+        for keycode in &keys {
+            if keycode < 8 {
+                continue;
+            }
+
+            let scancode = (keycode - 8) as u32;
+            let keysym = wt.xconn.keycode_to_keysym(keycode);
+            let virtual_keycode = events::keysym_to_element(keysym as c_uint);
+
+            callback(Event::WindowEvent {
+                window_id,
+                event: WindowEvent::KeyboardInput {
+                    device_id,
+                    input: KeyboardInput {
+                        scancode,
+                        state,
+                        virtual_keycode,
+                        modifiers,
+                    },
+                    is_synthetic: true,
+                },
+            });
+        }
+    }
 }
--- a/src/platform_impl/linux/x11/mod.rs
+++ b/src/platform_impl/linux/x11/mod.rs
@@ -1,4 +1,10 @@
-#![cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd"))]
+#![cfg(any(
+    target_os = "linux",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "netbsd",
+    target_os = "openbsd"
+))]

 mod dnd;
 mod event_processor;
@@ -26,6 +32,7 @@ use std::{
    rc::Rc,
    slice,
    sync::{mpsc, Arc, Mutex, Weak},
+    time::{Duration, Instant},
 };

 use libc::{self, setlocale, LC_CTYPE};
@@ -34,10 +41,11 @@ use self::{
    dnd::{Dnd, DndState},
    event_processor::EventProcessor,
    ime::{Ime, ImeCreationError, ImeReceiver, ImeSender},
+    util::modifiers::ModifierKeymap,
 };
 use crate::{
    error::OsError as RootOsError,
-    event::{Event, WindowEvent},
+    event::{Event, StartCause, WindowEvent},
    event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootELW},
    platform_impl::{platform::sticky_exit_callback, PlatformSpecificWindowBuilderAttributes},
    window::WindowAttributes,
@@ -143,6 +151,9 @@ impl<T: 'static> EventLoop<T> {

        xconn.update_cached_wm_info(root);

+        let mut mod_keymap = ModifierKeymap::new();
+        mod_keymap.reset_from_x_connection(&xconn);
+
        let target = Rc::new(RootELW {
            p: super::EventLoopWindowTarget::X(EventLoopWindowTarget {
                ime,
@@ -186,6 +197,8 @@ impl<T: 'static> EventLoop<T> {
            randr_event_offset,
            ime_receiver,
            xi2ext,
+            mod_keymap,
+            device_mod_state: Default::default(),
        };

        // Register for device hotplug events
@@ -256,6 +269,8 @@ impl<T: 'static> EventLoop<T> {
        );

        loop {
+            self.drain_events();
+
            // Empty the event buffer
            {
                let mut guard = self.pending_events.borrow_mut();
@@ -303,69 +318,58 @@ impl<T: 'static> EventLoop<T> {
                );
            }

+            let start = Instant::now();
+            let (mut cause, deadline, mut timeout);
+
            match control_flow {
                ControlFlow::Exit => break,
                ControlFlow::Poll => {
-                    // non-blocking dispatch
-                    self.inner_loop
-                        .dispatch(Some(::std::time::Duration::from_millis(0)), &mut ())
-                        .unwrap();
-                    callback(
-                        crate::event::Event::NewEvents(crate::event::StartCause::Poll),
-                        &self.target,
-                        &mut control_flow,
-                    );
+                    cause = StartCause::Poll;
+                    deadline = None;
+                    timeout = Some(Duration::from_millis(0));
                }
                ControlFlow::Wait => {
-                    self.inner_loop.dispatch(None, &mut ()).unwrap();
-                    callback(
-                        crate::event::Event::NewEvents(crate::event::StartCause::WaitCancelled {
-                            start: ::std::time::Instant::now(),
-                            requested_resume: None,
-                        }),
-                        &self.target,
-                        &mut control_flow,
-                    );
-                }
-                ControlFlow::WaitUntil(deadline) => {
-                    let start = ::std::time::Instant::now();
-                    // compute the blocking duration
-                    let duration = if deadline > start {
-                        deadline - start
-                    } else {
-                        ::std::time::Duration::from_millis(0)
+                    cause = StartCause::WaitCancelled {
+                        start,
+                        requested_resume: None,
                    };
-                    self.inner_loop.dispatch(Some(duration), &mut ()).unwrap();
-                    let now = std::time::Instant::now();
-                    if now < deadline {
-                        callback(
-                            crate::event::Event::NewEvents(
-                                crate::event::StartCause::WaitCancelled {
-                                    start,
-                                    requested_resume: Some(deadline),
-                                },
-                            ),
-                            &self.target,
-                            &mut control_flow,
-                        );
+                    deadline = None;
+                    timeout = None;
+                }
+                ControlFlow::WaitUntil(wait_deadline) => {
+                    cause = StartCause::ResumeTimeReached {
+                        start,
+                        requested_resume: wait_deadline,
+                    };
+                    timeout = if wait_deadline > start {
+                        Some(wait_deadline - start)
                    } else {
-                        callback(
-                            crate::event::Event::NewEvents(
-                                crate::event::StartCause::ResumeTimeReached {
-                                    start,
-                                    requested_resume: deadline,
-                                },
-                            ),
-                            &self.target,
-                            &mut control_flow,
-                        );
-                    }
+                        Some(Duration::from_millis(0))
+                    };
+                    deadline = Some(wait_deadline);
                }
            }

-            // If the user callback had any interaction with the X server,
-            // it may have received and buffered some user input events.
-            self.drain_events();
+            if self.events_waiting() {
+                timeout = Some(Duration::from_millis(0));
+            }
+
+            self.inner_loop.dispatch(timeout, &mut ()).unwrap();
+
+            if let Some(deadline) = deadline {
+                if deadline > Instant::now() {
+                    cause = StartCause::WaitCancelled {
+                        start,
+                        requested_resume: Some(deadline),
+                    };
+                }
+            }
+
+            callback(
+                crate::event::Event::NewEvents(cause),
+                &self.target,
+                &mut control_flow,
+            );
        }

        callback(
@@ -389,6 +393,10 @@ impl<T: 'static> EventLoop<T> {

        drain_events(&mut processor, &mut pending_events);
    }
+
+    fn events_waiting(&self) -> bool {
+        !self.pending_events.borrow().is_empty() || self.event_processor.borrow().poll()
+    }
 }

 fn drain_events<T: 'static>(
@@ -423,8 +431,14 @@ impl<T> EventLoopWindowTarget<T> {
 }

 impl<T: 'static> EventLoopProxy<T> {
-    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed> {
-        self.user_sender.send(event).map_err(|_| EventLoopClosed)
+    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
+        self.user_sender.send(event).map_err(|e| {
+            EventLoopClosed(if let ::calloop::channel::SendError::Disconnected(x) = e {
+                x
+            } else {
+                unreachable!()
+            })
+        })
    }
 }

--- a/src/platform_impl/linux/x11/monitor.rs
+++ b/src/platform_impl/linux/x11/monitor.rs
@@ -130,6 +130,24 @@ impl MonitorHandle {
        })
    }

+    pub fn dummy() -> Self {
+        MonitorHandle {
+            id: 0,
+            name: "<dummy monitor>".into(),
+            hidpi_factor: 1.0,
+            dimensions: (1, 1),
+            position: (0, 0),
+            primary: true,
+            rect: util::AaRect::new((0, 0), (1, 1)),
+            video_modes: Vec::new(),
+        }
+    }
+
+    pub(crate) fn is_dummy(&self) -> bool {
+        // Zero is an invalid XID value; no real monitor will have it
+        self.id == 0
+    }
+
    pub fn name(&self) -> Option<String> {
        Some(self.name.clone())
    }
@@ -167,9 +185,13 @@ impl MonitorHandle {
 impl XConnection {
    pub fn get_monitor_for_window(&self, window_rect: Option<util::AaRect>) -> MonitorHandle {
        let monitors = self.available_monitors();
-        let default = monitors
-            .get(0)
-            .expect("[winit] Failed to find any monitors using XRandR.");
+
+        if monitors.is_empty() {
+            // Return a dummy monitor to avoid panicking
+            return MonitorHandle::dummy();
+        }
+
+        let default = monitors.get(0).unwrap();

        let window_rect = match window_rect {
            Some(rect) => rect,
@@ -259,7 +281,7 @@ impl XConnection {
        self.available_monitors()
            .into_iter()
            .find(|monitor| monitor.primary)
-            .expect("[winit] Failed to find any monitors using XRandR.")
+            .unwrap_or_else(MonitorHandle::dummy)
    }

    pub fn select_xrandr_input(&self, root: Window) -> Result<c_int, XError> {
--- a/src/platform_impl/linux/x11/util/cursor.rs
+++ b/src/platform_impl/linux/x11/util/cursor.rs
@@ -0,0 +1,129 @@
+use crate::window::CursorIcon;
+
+use super::*;
+
+impl XConnection {
+    pub fn set_cursor_icon(&self, window: ffi::Window, cursor: Option<CursorIcon>) {
+        let cursor = *self
+            .cursor_cache
+            .lock()
+            .entry(cursor)
+            .or_insert_with(|| self.get_cursor(cursor));
+
+        self.update_cursor(window, cursor);
+    }
+
+    fn create_empty_cursor(&self) -> ffi::Cursor {
+        let data = 0;
+        let pixmap = unsafe {
+            let screen = (self.xlib.XDefaultScreen)(self.display);
+            let window = (self.xlib.XRootWindow)(self.display, screen);
+            (self.xlib.XCreateBitmapFromData)(self.display, window, &data, 1, 1)
+        };
+
+        if pixmap == 0 {
+            panic!("failed to allocate pixmap for cursor");
+        }
+
+        unsafe {
+            // We don't care about this color, since it only fills bytes
+            // in the pixmap which are not 0 in the mask.
+            let mut dummy_color = MaybeUninit::uninit();
+            let cursor = (self.xlib.XCreatePixmapCursor)(
+                self.display,
+                pixmap,
+                pixmap,
+                dummy_color.as_mut_ptr(),
+                dummy_color.as_mut_ptr(),
+                0,
+                0,
+            );
+            (self.xlib.XFreePixmap)(self.display, pixmap);
+
+            cursor
+        }
+    }
+
+    fn load_cursor(&self, name: &[u8]) -> ffi::Cursor {
+        unsafe {
+            (self.xcursor.XcursorLibraryLoadCursor)(self.display, name.as_ptr() as *const c_char)
+        }
+    }
+
+    fn load_first_existing_cursor(&self, names: &[&[u8]]) -> ffi::Cursor {
+        for name in names.iter() {
+            let xcursor = self.load_cursor(name);
+            if xcursor != 0 {
+                return xcursor;
+            }
+        }
+        0
+    }
+
+    fn get_cursor(&self, cursor: Option<CursorIcon>) -> ffi::Cursor {
+        let cursor = match cursor {
+            Some(cursor) => cursor,
+            None => return self.create_empty_cursor(),
+        };
+
+        let load = |name: &[u8]| self.load_cursor(name);
+
+        let loadn = |names: &[&[u8]]| self.load_first_existing_cursor(names);
+
+        // Try multiple names in some cases where the name
+        // differs on the desktop environments or themes.
+        //
+        // Try the better looking (or more suiting) names first.
+        match cursor {
+            CursorIcon::Alias => load(b"link\0"),
+            CursorIcon::Arrow => load(b"arrow\0"),
+            CursorIcon::Cell => load(b"plus\0"),
+            CursorIcon::Copy => load(b"copy\0"),
+            CursorIcon::Crosshair => load(b"crosshair\0"),
+            CursorIcon::Default => load(b"left_ptr\0"),
+            CursorIcon::Hand => loadn(&[b"hand2\0", b"hand1\0"]),
+            CursorIcon::Help => load(b"question_arrow\0"),
+            CursorIcon::Move => load(b"move\0"),
+            CursorIcon::Grab => loadn(&[b"openhand\0", b"grab\0"]),
+            CursorIcon::Grabbing => loadn(&[b"closedhand\0", b"grabbing\0"]),
+            CursorIcon::Progress => load(b"left_ptr_watch\0"),
+            CursorIcon::AllScroll => load(b"all-scroll\0"),
+            CursorIcon::ContextMenu => load(b"context-menu\0"),
+
+            CursorIcon::NoDrop => loadn(&[b"no-drop\0", b"circle\0"]),
+            CursorIcon::NotAllowed => load(b"crossed_circle\0"),
+
+            // Resize cursors
+            CursorIcon::EResize => load(b"right_side\0"),
+            CursorIcon::NResize => load(b"top_side\0"),
+            CursorIcon::NeResize => load(b"top_right_corner\0"),
+            CursorIcon::NwResize => load(b"top_left_corner\0"),
+            CursorIcon::SResize => load(b"bottom_side\0"),
+            CursorIcon::SeResize => load(b"bottom_right_corner\0"),
+            CursorIcon::SwResize => load(b"bottom_left_corner\0"),
+            CursorIcon::WResize => load(b"left_side\0"),
+            CursorIcon::EwResize => load(b"h_double_arrow\0"),
+            CursorIcon::NsResize => load(b"v_double_arrow\0"),
+            CursorIcon::NwseResize => loadn(&[b"bd_double_arrow\0", b"size_bdiag\0"]),
+            CursorIcon::NeswResize => loadn(&[b"fd_double_arrow\0", b"size_fdiag\0"]),
+            CursorIcon::ColResize => loadn(&[b"split_h\0", b"h_double_arrow\0"]),
+            CursorIcon::RowResize => loadn(&[b"split_v\0", b"v_double_arrow\0"]),
+
+            CursorIcon::Text => loadn(&[b"text\0", b"xterm\0"]),
+            CursorIcon::VerticalText => load(b"vertical-text\0"),
+
+            CursorIcon::Wait => load(b"watch\0"),
+
+            CursorIcon::ZoomIn => load(b"zoom-in\0"),
+            CursorIcon::ZoomOut => load(b"zoom-out\0"),
+        }
+    }
+
+    fn update_cursor(&self, window: ffi::Window, cursor: ffi::Cursor) {
+        unsafe {
+            (self.xlib.XDefineCursor)(self.display, window, cursor);
+
+            self.flush_requests().expect("Failed to set the cursor");
+        }
+    }
+}
--- a/src/platform_impl/linux/x11/util/hint.rs
+++ b/src/platform_impl/linux/x11/util/hint.rs
@@ -72,21 +72,21 @@ impl Default for WindowType {
 impl WindowType {
    pub(crate) fn as_atom(&self, xconn: &Arc<XConnection>) -> ffi::Atom {
        use self::WindowType::*;
-        let atom_name: &[u8] = match self {
-            &Desktop => b"_NET_WM_WINDOW_TYPE_DESKTOP\0",
-            &Dock => b"_NET_WM_WINDOW_TYPE_DOCK\0",
-            &Toolbar => b"_NET_WM_WINDOW_TYPE_TOOLBAR\0",
-            &Menu => b"_NET_WM_WINDOW_TYPE_MENU\0",
-            &Utility => b"_NET_WM_WINDOW_TYPE_UTILITY\0",
-            &Splash => b"_NET_WM_WINDOW_TYPE_SPLASH\0",
-            &Dialog => b"_NET_WM_WINDOW_TYPE_DIALOG\0",
-            &DropdownMenu => b"_NET_WM_WINDOW_TYPE_DROPDOWN_MENU\0",
-            &PopupMenu => b"_NET_WM_WINDOW_TYPE_POPUP_MENU\0",
-            &Tooltip => b"_NET_WM_WINDOW_TYPE_TOOLTIP\0",
-            &Notification => b"_NET_WM_WINDOW_TYPE_NOTIFICATION\0",
-            &Combo => b"_NET_WM_WINDOW_TYPE_COMBO\0",
-            &Dnd => b"_NET_WM_WINDOW_TYPE_DND\0",
-            &Normal => b"_NET_WM_WINDOW_TYPE_NORMAL\0",
+        let atom_name: &[u8] = match *self {
+            Desktop => b"_NET_WM_WINDOW_TYPE_DESKTOP\0",
+            Dock => b"_NET_WM_WINDOW_TYPE_DOCK\0",
+            Toolbar => b"_NET_WM_WINDOW_TYPE_TOOLBAR\0",
+            Menu => b"_NET_WM_WINDOW_TYPE_MENU\0",
+            Utility => b"_NET_WM_WINDOW_TYPE_UTILITY\0",
+            Splash => b"_NET_WM_WINDOW_TYPE_SPLASH\0",
+            Dialog => b"_NET_WM_WINDOW_TYPE_DIALOG\0",
+            DropdownMenu => b"_NET_WM_WINDOW_TYPE_DROPDOWN_MENU\0",
+            PopupMenu => b"_NET_WM_WINDOW_TYPE_POPUP_MENU\0",
+            Tooltip => b"_NET_WM_WINDOW_TYPE_TOOLTIP\0",
+            Notification => b"_NET_WM_WINDOW_TYPE_NOTIFICATION\0",
+            Combo => b"_NET_WM_WINDOW_TYPE_COMBO\0",
+            Dnd => b"_NET_WM_WINDOW_TYPE_DND\0",
+            Normal => b"_NET_WM_WINDOW_TYPE_NORMAL\0",
        };
        unsafe { xconn.get_atom_unchecked(atom_name) }
    }
--- a/src/platform_impl/linux/x11/util/input.rs
+++ b/src/platform_impl/linux/x11/util/input.rs
@@ -11,14 +11,17 @@ pub const VIRTUAL_CORE_KEYBOARD: c_int = 3;
 // To test if `lookup_utf8` works correctly, set this to 1.
 const TEXT_BUFFER_SIZE: usize = 1024;

-impl From<ffi::XIModifierState> for ModifiersState {
-    fn from(mods: ffi::XIModifierState) -> Self {
-        let state = mods.effective as c_uint;
+impl ModifiersState {
+    pub(crate) fn from_x11(state: &ffi::XIModifierState) -> Self {
+        ModifiersState::from_x11_mask(state.effective as c_uint)
+    }
+
+    pub(crate) fn from_x11_mask(mask: c_uint) -> Self {
        ModifiersState {
-            alt: state & ffi::Mod1Mask != 0,
-            shift: state & ffi::ShiftMask != 0,
-            ctrl: state & ffi::ControlMask != 0,
-            logo: state & ffi::Mod4Mask != 0,
+            alt: mask & ffi::Mod1Mask != 0,
+            shift: mask & ffi::ShiftMask != 0,
+            ctrl: mask & ffi::ControlMask != 0,
+            logo: mask & ffi::Mod4Mask != 0,
        }
    }
 }
@@ -40,7 +43,7 @@ pub struct PointerState<'a> {

 impl<'a> PointerState<'a> {
    pub fn get_modifier_state(&self) -> ModifiersState {
-        self.modifiers.into()
+        ModifiersState::from_x11(&self.modifiers)
    }
 }

--- a/src/platform_impl/linux/x11/util/keys.rs
+++ b/src/platform_impl/linux/x11/util/keys.rs
@@ -0,0 +1,92 @@
+use std::{iter::Enumerate, ptr, slice::Iter};
+
+use super::*;
+
+pub struct Keymap {
+    keys: [u8; 32],
+}
+
+pub struct KeymapIter<'a> {
+    iter: Enumerate<Iter<'a, u8>>,
+    index: usize,
+    item: Option<u8>,
+}
+
+impl Keymap {
+    pub fn iter(&self) -> KeymapIter<'_> {
+        KeymapIter {
+            iter: self.keys.iter().enumerate(),
+            index: 0,
+            item: None,
+        }
+    }
+}
+
+impl<'a> IntoIterator for &'a Keymap {
+    type Item = ffi::KeyCode;
+    type IntoIter = KeymapIter<'a>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.iter()
+    }
+}
+
+impl Iterator for KeymapIter<'_> {
+    type Item = ffi::KeyCode;
+
+    fn next(&mut self) -> Option<ffi::KeyCode> {
+        if self.item.is_none() {
+            while let Some((index, &item)) = self.iter.next() {
+                if item != 0 {
+                    self.index = index;
+                    self.item = Some(item);
+                    break;
+                }
+            }
+        }
+
+        self.item.take().map(|item| {
+            debug_assert!(item != 0);
+
+            let bit = first_bit(item);
+
+            if item != bit {
+                // Remove the first bit; save the rest for further iterations
+                self.item = Some(item ^ bit);
+            }
+
+            let shift = bit.trailing_zeros() + (self.index * 8) as u32;
+            shift as ffi::KeyCode
+        })
+    }
+}
+
+impl XConnection {
+    pub fn keycode_to_keysym(&self, keycode: ffi::KeyCode) -> ffi::KeySym {
+        unsafe { (self.xlib.XKeycodeToKeysym)(self.display, keycode, 0) }
+    }
+
+    pub fn lookup_keysym(&self, xkev: &mut ffi::XKeyEvent) -> ffi::KeySym {
+        let mut keysym = 0;
+
+        unsafe {
+            (self.xlib.XLookupString)(xkev, ptr::null_mut(), 0, &mut keysym, ptr::null_mut());
+        }
+
+        keysym
+    }
+
+    pub fn query_keymap(&self) -> Keymap {
+        let mut keys = [0; 32];
+
+        unsafe {
+            (self.xlib.XQueryKeymap)(self.display, keys.as_mut_ptr() as *mut c_char);
+        }
+
+        Keymap { keys }
+    }
+}
+
+fn first_bit(b: u8) -> u8 {
+    1 << b.trailing_zeros()
+}
--- a/src/platform_impl/linux/x11/util/mod.rs
+++ b/src/platform_impl/linux/x11/util/mod.rs
@@ -3,12 +3,15 @@

 mod atom;
 mod client_msg;
+mod cursor;
 mod format;
 mod geometry;
 mod hint;
 mod icon;
 mod input;
+pub mod keys;
 mod memory;
+pub mod modifiers;
 mod randr;
 mod window_property;
 mod wm;
--- a/src/platform_impl/linux/x11/util/modifiers.rs
+++ b/src/platform_impl/linux/x11/util/modifiers.rs
@@ -0,0 +1,187 @@
+use std::{collections::HashMap, slice};
+
+use super::*;
+
+use crate::event::{ElementState, ModifiersState};
+
+// Offsets within XModifierKeymap to each set of keycodes.
+// We are only interested in Shift, Control, Alt, and Logo.
+//
+// There are 8 sets total. The order of keycode sets is:
+//     Shift, Lock, Control, Mod1 (Alt), Mod2, Mod3, Mod4 (Logo), Mod5
+//
+// https://tronche.com/gui/x/xlib/input/XSetModifierMapping.html
+const SHIFT_OFFSET: usize = 0;
+const CONTROL_OFFSET: usize = 2;
+const ALT_OFFSET: usize = 3;
+const LOGO_OFFSET: usize = 6;
+const NUM_MODS: usize = 8;
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum Modifier {
+    Alt,
+    Ctrl,
+    Shift,
+    Logo,
+}
+
+#[derive(Debug, Default)]
+pub struct ModifierKeymap {
+    // Maps keycodes to modifiers
+    keys: HashMap<ffi::KeyCode, Modifier>,
+}
+
+#[derive(Clone, Debug, Default)]
+pub struct ModifierKeyState {
+    // Contains currently pressed modifier keys and their corresponding modifiers
+    keys: HashMap<ffi::KeyCode, Modifier>,
+    state: ModifiersState,
+}
+
+impl ModifierKeymap {
+    pub fn new() -> ModifierKeymap {
+        ModifierKeymap::default()
+    }
+
+    pub fn get_modifier(&self, keycode: ffi::KeyCode) -> Option<Modifier> {
+        self.keys.get(&keycode).cloned()
+    }
+
+    pub fn reset_from_x_connection(&mut self, xconn: &XConnection) {
+        unsafe {
+            let keymap = (xconn.xlib.XGetModifierMapping)(xconn.display);
+
+            if keymap.is_null() {
+                panic!("failed to allocate XModifierKeymap");
+            }
+
+            self.reset_from_x_keymap(&*keymap);
+
+            (xconn.xlib.XFreeModifiermap)(keymap);
+        }
+    }
+
+    pub fn reset_from_x_keymap(&mut self, keymap: &ffi::XModifierKeymap) {
+        let keys_per_mod = keymap.max_keypermod as usize;
+
+        let keys = unsafe {
+            slice::from_raw_parts(keymap.modifiermap as *const _, keys_per_mod * NUM_MODS)
+        };
+
+        self.keys.clear();
+
+        self.read_x_keys(keys, SHIFT_OFFSET, keys_per_mod, Modifier::Shift);
+        self.read_x_keys(keys, CONTROL_OFFSET, keys_per_mod, Modifier::Ctrl);
+        self.read_x_keys(keys, ALT_OFFSET, keys_per_mod, Modifier::Alt);
+        self.read_x_keys(keys, LOGO_OFFSET, keys_per_mod, Modifier::Logo);
+    }
+
+    fn read_x_keys(
+        &mut self,
+        keys: &[ffi::KeyCode],
+        offset: usize,
+        keys_per_mod: usize,
+        modifier: Modifier,
+    ) {
+        let start = offset * keys_per_mod;
+        let end = start + keys_per_mod;
+
+        for &keycode in &keys[start..end] {
+            if keycode != 0 {
+                self.keys.insert(keycode, modifier);
+            }
+        }
+    }
+}
+
+impl ModifierKeyState {
+    pub fn update_keymap(&mut self, mods: &ModifierKeymap) {
+        self.keys.retain(|k, v| {
+            if let Some(m) = mods.get_modifier(*k) {
+                *v = m;
+                true
+            } else {
+                false
+            }
+        });
+
+        self.reset_state();
+    }
+
+    pub fn update_state(
+        &mut self,
+        state: &ModifiersState,
+        except: Option<Modifier>,
+    ) -> Option<ModifiersState> {
+        let mut new_state = *state;
+
+        match except {
+            Some(Modifier::Alt) => new_state.alt = self.state.alt,
+            Some(Modifier::Ctrl) => new_state.ctrl = self.state.ctrl,
+            Some(Modifier::Shift) => new_state.shift = self.state.shift,
+            Some(Modifier::Logo) => new_state.logo = self.state.logo,
+            None => (),
+        }
+
+        if self.state == new_state {
+            None
+        } else {
+            self.keys.retain(|_k, v| get_modifier(&new_state, *v));
+            self.state = new_state;
+            Some(new_state)
+        }
+    }
+
+    pub fn modifiers(&self) -> ModifiersState {
+        self.state
+    }
+
+    pub fn key_event(&mut self, state: ElementState, keycode: ffi::KeyCode, modifier: Modifier) {
+        match state {
+            ElementState::Pressed => self.key_press(keycode, modifier),
+            ElementState::Released => self.key_release(keycode),
+        }
+    }
+
+    pub fn key_press(&mut self, keycode: ffi::KeyCode, modifier: Modifier) {
+        self.keys.insert(keycode, modifier);
+
+        set_modifier(&mut self.state, modifier, true);
+    }
+
+    pub fn key_release(&mut self, keycode: ffi::KeyCode) {
+        if let Some(modifier) = self.keys.remove(&keycode) {
+            if self.keys.values().find(|&&m| m == modifier).is_none() {
+                set_modifier(&mut self.state, modifier, false);
+            }
+        }
+    }
+
+    fn reset_state(&mut self) {
+        let mut new_state = ModifiersState::default();
+
+        for &m in self.keys.values() {
+            set_modifier(&mut new_state, m, true);
+        }
+
+        self.state = new_state;
+    }
+}
+
+fn get_modifier(state: &ModifiersState, modifier: Modifier) -> bool {
+    match modifier {
+        Modifier::Alt => state.alt,
+        Modifier::Ctrl => state.ctrl,
+        Modifier::Shift => state.shift,
+        Modifier::Logo => state.logo,
+    }
+}
+
+fn set_modifier(state: &mut ModifiersState, modifier: Modifier, value: bool) {
+    match modifier {
+        Modifier::Alt => state.alt = value,
+        Modifier::Ctrl => state.ctrl = value,
+        Modifier::Shift => state.shift = value,
+        Modifier::Logo => state.logo = value,
+    }
+}
--- a/src/platform_impl/linux/x11/util/randr.rs
+++ b/src/platform_impl/linux/x11/util/randr.rs
@@ -99,7 +99,8 @@ impl XConnection {
                    // video mode is returned to the user
                    monitor: None,
                }
-            });
+            })
+            .collect();

        let name_slice = slice::from_raw_parts(
            (*output_info).name as *mut u8,
@@ -119,7 +120,7 @@ impl XConnection {
        };

        (self.xrandr.XRRFreeOutputInfo)(output_info);
-        Some((name, hidpi_factor, modes.collect()))
+        Some((name, hidpi_factor, modes))
    }
    pub fn set_crtc_config(&self, crtc_id: RRCrtc, mode_id: RRMode) -> Result<(), ()> {
        unsafe {
--- a/src/platform_impl/linux/x11/window.rs
+++ b/src/platform_impl/linux/x11/window.rs
@@ -1,10 +1,10 @@
-use raw_window_handle::unix::X11Handle;
+use raw_window_handle::unix::XlibHandle;
 use std::{
    cmp,
    collections::HashSet,
    env,
    ffi::CString,
-    mem::{self, MaybeUninit},
+    mem::{self, replace, MaybeUninit},
    os::raw::*,
    path::Path,
    ptr, slice,
@@ -28,27 +28,18 @@ use crate::{

 use super::{ffi, util, EventLoopWindowTarget, ImeSender, WindowId, XConnection, XError};

-unsafe extern "C" fn visibility_predicate(
-    _display: *mut ffi::Display,
-    event: *mut ffi::XEvent,
-    arg: ffi::XPointer, // We populate this with the window ID (by value) when we call XIfEvent
-) -> ffi::Bool {
-    let event: &ffi::XAnyEvent = (*event).as_ref();
-    let window = arg as ffi::Window;
-    (event.window == window && event.type_ == ffi::VisibilityNotify) as _
-}
-
-#[derive(Debug, Default)]
+#[derive(Debug)]
 pub struct SharedState {
    pub cursor_pos: Option<(f64, f64)>,
    pub size: Option<(u32, u32)>,
    pub position: Option<(i32, i32)>,
    pub inner_position: Option<(i32, i32)>,
    pub inner_position_rel_parent: Option<(i32, i32)>,
-    pub guessed_dpi: Option<f64>,
-    pub last_monitor: Option<X11MonitorHandle>,
+    pub last_monitor: X11MonitorHandle,
    pub dpi_adjusted: Option<(f64, f64)>,
    pub fullscreen: Option<Fullscreen>,
+    // Set when application calls `set_fullscreen` when window is not visible
+    pub desired_fullscreen: Option<Option<Fullscreen>>,
    // Used to restore position after exiting fullscreen
    pub restore_position: Option<(i32, i32)>,
    // Used to restore video mode after exiting fullscreen
@@ -56,13 +47,43 @@ pub struct SharedState {
    pub frame_extents: Option<util::FrameExtentsHeuristic>,
    pub min_inner_size: Option<LogicalSize>,
    pub max_inner_size: Option<LogicalSize>,
+    pub visibility: Visibility,
+}
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum Visibility {
+    No,
+    Yes,
+    // Waiting for VisibilityNotify
+    YesWait,
 }

 impl SharedState {
-    fn new(dpi_factor: f64) -> Mutex<Self> {
-        let mut shared_state = SharedState::default();
-        shared_state.guessed_dpi = Some(dpi_factor);
-        Mutex::new(shared_state)
+    fn new(last_monitor: X11MonitorHandle, is_visible: bool) -> Mutex<Self> {
+        let visibility = if is_visible {
+            Visibility::YesWait
+        } else {
+            Visibility::No
+        };
+
+        Mutex::new(SharedState {
+            last_monitor,
+            visibility,
+
+            cursor_pos: None,
+            size: None,
+            position: None,
+            inner_position: None,
+            inner_position_rel_parent: None,
+            dpi_adjusted: None,
+            fullscreen: None,
+            desired_fullscreen: None,
+            restore_position: None,
+            desktop_video_mode: None,
+            frame_extents: None,
+            min_inner_size: None,
+            max_inner_size: None,
+        })
    }
 }

@@ -91,34 +112,27 @@ impl UnownedWindow {
        let xconn = &event_loop.xconn;
        let root = event_loop.root;

-        let monitors = xconn.available_monitors();
-        let dpi_factor = if !monitors.is_empty() {
-            let mut dpi_factor = Some(monitors[0].hidpi_factor());
-            for monitor in &monitors {
-                if Some(monitor.hidpi_factor()) != dpi_factor {
-                    dpi_factor = None;
-                }
-            }
-            dpi_factor.unwrap_or_else(|| {
-                xconn
-                    .query_pointer(root, util::VIRTUAL_CORE_POINTER)
-                    .ok()
-                    .and_then(|pointer_state| {
-                        let (x, y) = (pointer_state.root_x as i64, pointer_state.root_y as i64);
-                        let mut dpi_factor = None;
-                        for monitor in &monitors {
-                            if monitor.rect.contains_point(x, y) {
-                                dpi_factor = Some(monitor.hidpi_factor());
-                                break;
-                            }
-                        }
-                        dpi_factor
-                    })
-                    .unwrap_or(1.0)
-            })
+        let mut monitors = xconn.available_monitors();
+        let guessed_monitor = if monitors.is_empty() {
+            X11MonitorHandle::dummy()
        } else {
-            return Err(os_error!(OsError::XMisc("No monitors were detected.")));
+            xconn
+                .query_pointer(root, util::VIRTUAL_CORE_POINTER)
+                .ok()
+                .and_then(|pointer_state| {
+                    let (x, y) = (pointer_state.root_x as i64, pointer_state.root_y as i64);
+
+                    for i in 0..monitors.len() {
+                        if monitors[i].rect.contains_point(x, y) {
+                            return Some(monitors.swap_remove(i));
+                        }
+                    }
+
+                    None
+                })
+                .unwrap_or_else(|| monitors.swap_remove(0))
        };
+        let dpi_factor = guessed_monitor.hidpi_factor();

        info!("Guessed window DPI factor: {}", dpi_factor);

@@ -230,7 +244,7 @@ impl UnownedWindow {
            cursor_grabbed: Mutex::new(false),
            cursor_visible: Mutex::new(true),
            ime_sender: Mutex::new(event_loop.ime_sender.clone()),
-            shared_state: SharedState::new(dpi_factor),
+            shared_state: SharedState::new(guessed_monitor, window_attrs.visible),
            pending_redraws: event_loop.pending_redraws.clone(),
        };

@@ -296,9 +310,7 @@ impl UnownedWindow {

            window.set_pid().map(|flusher| flusher.queue());

-            if pl_attribs.x11_window_type != Default::default() {
-                window.set_window_type(pl_attribs.x11_window_type).queue();
-            }
+            window.set_window_types(pl_attribs.x11_window_types).queue();

            if let Some(variant) = pl_attribs.gtk_theme_variant {
                window.set_gtk_theme_variant(variant).queue();
@@ -412,35 +424,13 @@ impl UnownedWindow {
            if window_attrs.fullscreen.is_some() {
                window
                    .set_fullscreen_inner(window_attrs.fullscreen.clone())
-                    .unwrap()
-                    .queue();
+                    .map(|flusher| flusher.queue());
            }
            if window_attrs.always_on_top {
                window
                    .set_always_on_top_inner(window_attrs.always_on_top)
                    .queue();
            }
-
-            if window_attrs.visible {
-                unsafe {
-                    // XSetInputFocus generates an error if the window is not visible, so we wait
-                    // until we receive VisibilityNotify.
-                    let mut event = MaybeUninit::uninit();
-                    (xconn.xlib.XIfEvent)(
-                        // This will flush the request buffer IF it blocks.
-                        xconn.display,
-                        event.as_mut_ptr(),
-                        Some(visibility_predicate),
-                        window.xwindow as _,
-                    );
-                    (xconn.xlib.XSetInputFocus)(
-                        xconn.display,
-                        window.xwindow,
-                        ffi::RevertToParent,
-                        ffi::CurrentTime,
-                    );
-                }
-            }
        }

        // We never want to give the user a broken window, since by then, it's too late to handle.
@@ -500,15 +490,19 @@ impl UnownedWindow {
        }
    }

-    fn set_window_type(&self, window_type: util::WindowType) -> util::Flusher<'_> {
+    fn set_window_types(&self, window_types: Vec<util::WindowType>) -> util::Flusher<'_> {
        let hint_atom = unsafe { self.xconn.get_atom_unchecked(b"_NET_WM_WINDOW_TYPE\0") };
-        let window_type_atom = window_type.as_atom(&self.xconn);
+        let atoms: Vec<_> = window_types
+            .iter()
+            .map(|t| t.as_atom(&self.xconn))
+            .collect();
+
        self.xconn.change_property(
            self.xwindow,
            hint_atom,
            ffi::XA_ATOM,
            util::PropMode::Replace,
-            &[window_type_atom],
+            &atoms,
        )
    }

@@ -566,11 +560,36 @@ impl UnownedWindow {
    fn set_fullscreen_hint(&self, fullscreen: bool) -> util::Flusher<'_> {
        let fullscreen_atom =
            unsafe { self.xconn.get_atom_unchecked(b"_NET_WM_STATE_FULLSCREEN\0") };
-        self.set_netwm(fullscreen.into(), (fullscreen_atom as c_long, 0, 0, 0))
+        let flusher = self.set_netwm(fullscreen.into(), (fullscreen_atom as c_long, 0, 0, 0));
+
+        if fullscreen {
+            // Ensure that the fullscreen window receives input focus to prevent
+            // locking up the user's display.
+            unsafe {
+                (self.xconn.xlib.XSetInputFocus)(
+                    self.xconn.display,
+                    self.xwindow,
+                    ffi::RevertToParent,
+                    ffi::CurrentTime,
+                );
+            }
+        }
+
+        flusher
    }

    fn set_fullscreen_inner(&self, fullscreen: Option<Fullscreen>) -> Option<util::Flusher<'_>> {
        let mut shared_state_lock = self.shared_state.lock();
+
+        match shared_state_lock.visibility {
+            // Setting fullscreen on a window that is not visible will generate an error.
+            Visibility::No | Visibility::YesWait => {
+                shared_state_lock.desired_fullscreen = Some(fullscreen);
+                return None;
+            }
+            Visibility::Yes => (),
+        }
+
        let old_fullscreen = shared_state_lock.fullscreen.clone();
        if old_fullscreen == fullscreen {
            return None;
@@ -631,6 +650,11 @@ impl UnownedWindow {
                    _ => unreachable!(),
                };

+                // Don't set fullscreen on an invalid dummy monitor handle
+                if monitor.is_dummy() {
+                    return None;
+                }
+
                if let Some(video_mode) = video_mode {
                    // FIXME: this is actually not correct if we're setting the
                    // video mode to a resolution higher than the current
@@ -674,37 +698,47 @@ impl UnownedWindow {

    #[inline]
    pub fn fullscreen(&self) -> Option<Fullscreen> {
-        self.shared_state.lock().fullscreen.clone()
+        let shared_state = self.shared_state.lock();
+
+        shared_state
+            .desired_fullscreen
+            .clone()
+            .unwrap_or_else(|| shared_state.fullscreen.clone())
    }

    #[inline]
    pub fn set_fullscreen(&self, fullscreen: Option<Fullscreen>) {
        if let Some(flusher) = self.set_fullscreen_inner(fullscreen) {
            flusher
-                .flush()
+                .sync()
                .expect("Failed to change window fullscreen state");
            self.invalidate_cached_frame_extents();
        }
    }

-    fn get_rect(&self) -> util::AaRect {
-        // TODO: This might round-trip more times than needed.
-        let position = self.outer_position_physical();
-        let size = self.outer_size_physical();
-        util::AaRect::new(position, size)
+    // Called by EventProcessor when a VisibilityNotify event is received
+    pub(crate) fn visibility_notify(&self) {
+        let mut shared_state = self.shared_state.lock();
+
+        match shared_state.visibility {
+            Visibility::No => unsafe {
+                (self.xconn.xlib.XUnmapWindow)(self.xconn.display, self.xwindow);
+            },
+            Visibility::Yes => (),
+            Visibility::YesWait => {
+                shared_state.visibility = Visibility::Yes;
+
+                if let Some(fullscreen) = shared_state.desired_fullscreen.take() {
+                    drop(shared_state);
+                    self.set_fullscreen(fullscreen);
+                }
+            }
+        }
    }

    #[inline]
    pub fn current_monitor(&self) -> X11MonitorHandle {
-        let monitor = self.shared_state.lock().last_monitor.as_ref().cloned();
-        monitor.unwrap_or_else(|| {
-            let monitor = self
-                .xconn
-                .get_monitor_for_window(Some(self.get_rect()))
-                .to_owned();
-            self.shared_state.lock().last_monitor = Some(monitor.clone());
-            monitor
-        })
+        self.shared_state.lock().last_monitor.clone()
    }

    pub fn available_monitors(&self) -> Vec<X11MonitorHandle> {
@@ -837,19 +871,31 @@ impl UnownedWindow {

    #[inline]
    pub fn set_visible(&self, visible: bool) {
-        match visible {
-            true => unsafe {
+        let mut shared_state = self.shared_state.lock();
+
+        match (visible, shared_state.visibility) {
+            (true, Visibility::Yes) | (true, Visibility::YesWait) | (false, Visibility::No) => {
+                return
+            }
+            _ => (),
+        }
+
+        if visible {
+            unsafe {
                (self.xconn.xlib.XMapRaised)(self.xconn.display, self.xwindow);
-                self.xconn
-                    .flush_requests()
-                    .expect("Failed to call XMapRaised");
-            },
-            false => unsafe {
+            }
+            self.xconn
+                .flush_requests()
+                .expect("Failed to call XMapRaised");
+            shared_state.visibility = Visibility::YesWait;
+        } else {
+            unsafe {
                (self.xconn.xlib.XUnmapWindow)(self.xconn.display, self.xwindow);
-                self.xconn
-                    .flush_requests()
-                    .expect("Failed to call XUnmapWindow");
-            },
+            }
+            self.xconn
+                .flush_requests()
+                .expect("Failed to call XUnmapWindow");
+            shared_state.visibility = Visibility::No;
        }
    }

@@ -946,17 +992,6 @@ impl UnownedWindow {
        self.logicalize_size(self.inner_size_physical())
    }

-    pub(crate) fn outer_size_physical(&self) -> (u32, u32) {
-        let extents = self.shared_state.lock().frame_extents.clone();
-        if let Some(extents) = extents {
-            let (w, h) = self.inner_size_physical();
-            extents.inner_size_to_outer(w, h)
-        } else {
-            self.update_cached_frame_extents();
-            self.outer_size_physical()
-        }
-    }
-
    #[inline]
    pub fn outer_size(&self) -> LogicalSize {
        let extents = self.shared_state.lock().frame_extents.clone();
@@ -1124,131 +1159,14 @@ impl UnownedWindow {
        unsafe { (self.xconn.xlib_xcb.XGetXCBConnection)(self.xconn.display) as *mut _ }
    }

-    fn load_cursor(&self, name: &[u8]) -> ffi::Cursor {
-        unsafe {
-            (self.xconn.xcursor.XcursorLibraryLoadCursor)(
-                self.xconn.display,
-                name.as_ptr() as *const c_char,
-            )
-        }
-    }
-
-    fn load_first_existing_cursor(&self, names: &[&[u8]]) -> ffi::Cursor {
-        for name in names.iter() {
-            let xcursor = self.load_cursor(name);
-            if xcursor != 0 {
-                return xcursor;
-            }
-        }
-        0
-    }
-
-    fn get_cursor(&self, cursor: CursorIcon) -> ffi::Cursor {
-        let load = |name: &[u8]| self.load_cursor(name);
-
-        let loadn = |names: &[&[u8]]| self.load_first_existing_cursor(names);
-
-        // Try multiple names in some cases where the name
-        // differs on the desktop environments or themes.
-        //
-        // Try the better looking (or more suiting) names first.
-        match cursor {
-            CursorIcon::Alias => load(b"link\0"),
-            CursorIcon::Arrow => load(b"arrow\0"),
-            CursorIcon::Cell => load(b"plus\0"),
-            CursorIcon::Copy => load(b"copy\0"),
-            CursorIcon::Crosshair => load(b"crosshair\0"),
-            CursorIcon::Default => load(b"left_ptr\0"),
-            CursorIcon::Hand => loadn(&[b"hand2\0", b"hand1\0"]),
-            CursorIcon::Help => load(b"question_arrow\0"),
-            CursorIcon::Move => load(b"move\0"),
-            CursorIcon::Grab => loadn(&[b"openhand\0", b"grab\0"]),
-            CursorIcon::Grabbing => loadn(&[b"closedhand\0", b"grabbing\0"]),
-            CursorIcon::Progress => load(b"left_ptr_watch\0"),
-            CursorIcon::AllScroll => load(b"all-scroll\0"),
-            CursorIcon::ContextMenu => load(b"context-menu\0"),
-
-            CursorIcon::NoDrop => loadn(&[b"no-drop\0", b"circle\0"]),
-            CursorIcon::NotAllowed => load(b"crossed_circle\0"),
-
-            // Resize cursors
-            CursorIcon::EResize => load(b"right_side\0"),
-            CursorIcon::NResize => load(b"top_side\0"),
-            CursorIcon::NeResize => load(b"top_right_corner\0"),
-            CursorIcon::NwResize => load(b"top_left_corner\0"),
-            CursorIcon::SResize => load(b"bottom_side\0"),
-            CursorIcon::SeResize => load(b"bottom_right_corner\0"),
-            CursorIcon::SwResize => load(b"bottom_left_corner\0"),
-            CursorIcon::WResize => load(b"left_side\0"),
-            CursorIcon::EwResize => load(b"h_double_arrow\0"),
-            CursorIcon::NsResize => load(b"v_double_arrow\0"),
-            CursorIcon::NwseResize => loadn(&[b"bd_double_arrow\0", b"size_bdiag\0"]),
-            CursorIcon::NeswResize => loadn(&[b"fd_double_arrow\0", b"size_fdiag\0"]),
-            CursorIcon::ColResize => loadn(&[b"split_h\0", b"h_double_arrow\0"]),
-            CursorIcon::RowResize => loadn(&[b"split_v\0", b"v_double_arrow\0"]),
-
-            CursorIcon::Text => loadn(&[b"text\0", b"xterm\0"]),
-            CursorIcon::VerticalText => load(b"vertical-text\0"),
-
-            CursorIcon::Wait => load(b"watch\0"),
-
-            CursorIcon::ZoomIn => load(b"zoom-in\0"),
-            CursorIcon::ZoomOut => load(b"zoom-out\0"),
-        }
-    }
-
-    fn update_cursor(&self, cursor: ffi::Cursor) {
-        unsafe {
-            (self.xconn.xlib.XDefineCursor)(self.xconn.display, self.xwindow, cursor);
-            if cursor != 0 {
-                (self.xconn.xlib.XFreeCursor)(self.xconn.display, cursor);
-            }
-            self.xconn
-                .flush_requests()
-                .expect("Failed to set or free the cursor");
-        }
-    }
-
    #[inline]
    pub fn set_cursor_icon(&self, cursor: CursorIcon) {
-        *self.cursor.lock() = cursor;
-        if *self.cursor_visible.lock() {
-            self.update_cursor(self.get_cursor(cursor));
+        let old_cursor = replace(&mut *self.cursor.lock(), cursor);
+        if cursor != old_cursor && *self.cursor_visible.lock() {
+            self.xconn.set_cursor_icon(self.xwindow, Some(cursor));
        }
    }

-    // TODO: This could maybe be cached. I don't think it's worth
-    // the complexity, since cursor changes are not so common,
-    // and this is just allocating a 1x1 pixmap...
-    fn create_empty_cursor(&self) -> Option<ffi::Cursor> {
-        let data = 0;
-        let pixmap = unsafe {
-            (self.xconn.xlib.XCreateBitmapFromData)(self.xconn.display, self.xwindow, &data, 1, 1)
-        };
-        if pixmap == 0 {
-            // Failed to allocate
-            return None;
-        }
-
-        let cursor = unsafe {
-            // We don't care about this color, since it only fills bytes
-            // in the pixmap which are not 0 in the mask.
-            let mut dummy_color = MaybeUninit::uninit();
-            let cursor = (self.xconn.xlib.XCreatePixmapCursor)(
-                self.xconn.display,
-                pixmap,
-                pixmap,
-                dummy_color.as_mut_ptr(),
-                dummy_color.as_mut_ptr(),
-                0,
-                0,
-            );
-            (self.xconn.xlib.XFreePixmap)(self.xconn.display, pixmap);
-            cursor
-        };
-        Some(cursor)
-    }
-
    #[inline]
    pub fn set_cursor_grab(&self, grab: bool) -> Result<(), ExternalError> {
        let mut grabbed_lock = self.cursor_grabbed.lock();
@@ -1318,14 +1236,13 @@ impl UnownedWindow {
            return;
        }
        let cursor = if visible {
-            self.get_cursor(*self.cursor.lock())
+            Some(*self.cursor.lock())
        } else {
-            self.create_empty_cursor()
-                .expect("Failed to create empty cursor")
+            None
        };
        *visible_lock = visible;
        drop(visible_lock);
-        self.update_cursor(cursor);
+        self.xconn.set_cursor_icon(self.xwindow, cursor);
    }

    #[inline]
@@ -1378,11 +1295,11 @@ impl UnownedWindow {
    }

    #[inline]
-    pub fn raw_window_handle(&self) -> X11Handle {
-        X11Handle {
+    pub fn raw_window_handle(&self) -> XlibHandle {
+        XlibHandle {
            window: self.xwindow,
            display: self.xconn.display as _,
-            ..X11Handle::empty()
+            ..XlibHandle::empty()
        }
    }
 }
--- a/src/platform_impl/linux/x11/xdisplay.rs
+++ b/src/platform_impl/linux/x11/xdisplay.rs
@@ -1,8 +1,10 @@
-use std::{error::Error, fmt, os::raw::c_int, ptr};
+use std::{collections::HashMap, error::Error, fmt, os::raw::c_int, ptr};

 use libc;
 use parking_lot::Mutex;

+use crate::window::CursorIcon;
+
 use super::ffi;

 /// A connection to an X server.
@@ -19,6 +21,7 @@ pub struct XConnection {
    pub display: *mut ffi::Display,
    pub x11_fd: c_int,
    pub latest_error: Mutex<Option<XError>>,
+    pub cursor_cache: Mutex<HashMap<Option<CursorIcon>, ffi::Cursor>>,
 }

 unsafe impl Send for XConnection {}
@@ -64,6 +67,7 @@ impl XConnection {
            display,
            x11_fd: fd,
            latest_error: Mutex::new(None),
+            cursor_cache: Default::default(),
        })
    }

--- a/src/platform_impl/macos/app_state.rs
+++ b/src/platform_impl/macos/app_state.rs
@@ -3,6 +3,7 @@ use std::{
    fmt::{self, Debug},
    hint::unreachable_unchecked,
    mem,
+    rc::Rc,
    sync::{
        atomic::{AtomicBool, Ordering},
        Mutex, MutexGuard,
@@ -37,13 +38,13 @@ pub trait EventHandler: Debug {
    fn handle_user_events(&mut self, control_flow: &mut ControlFlow);
 }

-struct EventLoopHandler<F, T: 'static> {
-    callback: F,
+struct EventLoopHandler<T: 'static> {
+    callback: Box<dyn FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow)>,
    will_exit: bool,
-    window_target: RootWindowTarget<T>,
+    window_target: Rc<RootWindowTarget<T>>,
 }

-impl<F, T> Debug for EventLoopHandler<F, T> {
+impl<T> Debug for EventLoopHandler<T> {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter
            .debug_struct("EventLoopHandler")
@@ -52,11 +53,7 @@ impl<F, T> Debug for EventLoopHandler<F, T> {
    }
 }

-impl<F, T> EventHandler for EventLoopHandler<F, T>
-where
-    F: 'static + FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
-    T: 'static,
-{
+impl<T> EventHandler for EventLoopHandler<T> {
    fn handle_nonuser_event(&mut self, event: Event<Never>, control_flow: &mut ControlFlow) {
        (self.callback)(event.userify(), &self.window_target, control_flow);
        self.will_exit |= *control_flow == ControlFlow::Exit;
@@ -87,7 +84,6 @@ struct Handler {
    start_time: Mutex<Option<Instant>>,
    callback: Mutex<Option<Box<dyn EventHandler>>>,
    pending_events: Mutex<VecDeque<Event<Never>>>,
-    deferred_events: Mutex<VecDeque<Event<Never>>>,
    pending_redraw: Mutex<Vec<WindowId>>,
    waker: Mutex<EventLoopWaker>,
 }
@@ -100,10 +96,6 @@ impl Handler {
        self.pending_events.lock().unwrap()
    }

-    fn deferred<'a>(&'a self) -> MutexGuard<'a, VecDeque<Event<Never>>> {
-        self.deferred_events.lock().unwrap()
-    }
-
    fn redraw<'a>(&'a self) -> MutexGuard<'a, Vec<WindowId>> {
        self.pending_redraw.lock().unwrap()
    }
@@ -148,10 +140,6 @@ impl Handler {
        mem::replace(&mut *self.events(), Default::default())
    }

-    fn take_deferred(&self) -> VecDeque<Event<Never>> {
-        mem::replace(&mut *self.deferred(), Default::default())
-    }
-
    fn should_redraw(&self) -> Vec<WindowId> {
        mem::replace(&mut *self.redraw(), Default::default())
    }
@@ -180,13 +168,20 @@ impl Handler {
 pub enum AppState {}

 impl AppState {
-    pub fn set_callback<F, T>(callback: F, window_target: RootWindowTarget<T>)
+    // This function extends lifetime of `callback` to 'static as its side effect
+    pub unsafe fn set_callback<F, T>(callback: F, window_target: Rc<RootWindowTarget<T>>)
    where
-        F: 'static + FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
-        T: 'static,
+        F: FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
    {
        *HANDLER.callback.lock().unwrap() = Some(Box::new(EventLoopHandler {
-            callback,
+            // This transmute is always safe, in case it was reached through `run`, since our
+            // lifetime will be already 'static. In other cases caller should ensure that all data
+            // they passed to callback will actually outlive it, some apps just can't move
+            // everything to event loop, so this is something that they should care about.
+            callback: mem::transmute::<
+                Box<dyn FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow)>,
+                Box<dyn FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow)>,
+            >(Box::new(callback)),
            will_exit: false,
            window_target,
        }));
@@ -260,20 +255,6 @@ impl AppState {
        HANDLER.events().append(&mut events);
    }

-    pub fn send_event_immediately(event: Event<Never>) {
-        if !unsafe { msg_send![class!(NSThread), isMainThread] } {
-            panic!("Event sent from different thread: {:#?}", event);
-        }
-        HANDLER.deferred().push_back(event);
-        if !HANDLER.get_in_callback() {
-            HANDLER.set_in_callback(true);
-            for event in HANDLER.take_deferred() {
-                HANDLER.handle_nonuser_event(event);
-            }
-            HANDLER.set_in_callback(false);
-        }
-    }
-
    pub fn cleared() {
        if !HANDLER.is_ready() {
            return;
@@ -294,12 +275,12 @@ impl AppState {
            HANDLER.set_in_callback(false);
        }
        if HANDLER.should_exit() {
-            let _: () = unsafe { msg_send![NSApp(), stop: nil] };
+            let _: () = unsafe { msg_send![NSApp(), terminate: nil] };
            return;
        }
        HANDLER.update_start_time();
        match HANDLER.get_old_and_new_control_flow() {
-            (ControlFlow::Exit, _) | (_, ControlFlow::Exit) => unreachable!(),
+            (ControlFlow::Exit, _) | (_, ControlFlow::Exit) => (),
            (old, new) if old == new => (),
            (_, ControlFlow::Wait) => HANDLER.waker().stop(),
            (_, ControlFlow::WaitUntil(instant)) => HANDLER.waker().start_at(instant),
--- a/src/platform_impl/macos/event.rs
+++ b/src/platform_impl/macos/event.rs
@@ -208,7 +208,7 @@ pub fn scancode_to_keycode(scancode: c_ushort) -> Option<VirtualKeyCode> {
 // While F1-F20 have scancodes we can match on, we have to check against UTF-16
 // constants for the rest.
 // https://developer.apple.com/documentation/appkit/1535851-function-key_unicodes?preferredLanguage=occ
-pub fn check_function_keys(string: &String) -> Option<VirtualKeyCode> {
+pub fn check_function_keys(string: &str) -> Option<VirtualKeyCode> {
    if let Some(ch) = string.encode_utf16().next() {
        return Some(match ch {
            0xf718 => VirtualKeyCode::F21,
@@ -264,6 +264,7 @@ pub unsafe fn modifier_event(
                virtual_keycode,
                modifiers: event_mods(ns_event),
            },
+            is_synthetic: false,
        })
    } else {
        None
--- a/src/platform_impl/macos/event_loop.rs
+++ b/src/platform_impl/macos/event_loop.rs
@@ -1,5 +1,6 @@
 use std::{
-    collections::VecDeque, marker::PhantomData, mem, os::raw::c_void, process, ptr, sync::mpsc,
+    collections::VecDeque, marker::PhantomData, mem, os::raw::c_void, process, ptr, rc::Rc,
+    sync::mpsc,
 };

 use cocoa::{
@@ -34,7 +35,7 @@ impl<T> Default for EventLoopWindowTarget<T> {
 }

 pub struct EventLoop<T: 'static> {
-    window_target: RootWindowTarget<T>,
+    window_target: Rc<RootWindowTarget<T>>,
    _delegate: IdRef,
 }

@@ -59,10 +60,10 @@ impl<T> EventLoop<T> {
        };
        setup_control_flow_observers();
        EventLoop {
-            window_target: RootWindowTarget {
+            window_target: Rc::new(RootWindowTarget {
                p: Default::default(),
                _marker: PhantomData,
-            },
+            }),
            _delegate: delegate,
        }
    }
@@ -81,28 +82,28 @@ impl<T> EventLoop<T> {
        &self.window_target
    }

-    pub fn run<F>(self, callback: F) -> !
+    pub fn run<F>(mut self, callback: F) -> !
    where
        F: 'static + FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
+    {
+        self.run_return(callback);
+        process::exit(0);
+    }
+
+    pub fn run_return<F>(&mut self, callback: F)
+    where
+        F: FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
    {
        unsafe {
            let _pool = NSAutoreleasePool::new(nil);
            let app = NSApp();
            assert_ne!(app, nil);
-            AppState::set_callback(callback, self.window_target);
+            AppState::set_callback(callback, Rc::clone(&self.window_target));
            let _: () = msg_send![app, run];
            AppState::exit();
-            process::exit(0)
        }
    }

-    pub fn run_return<F>(&mut self, _callback: F)
-    where
-        F: FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow),
-    {
-        unimplemented!();
-    }
-
    pub fn create_proxy(&self) -> Proxy<T> {
        Proxy::new(self.window_target.p.sender.clone())
    }
@@ -131,7 +132,7 @@ impl<T> Proxy<T> {
            // process user events through the normal OS EventLoop mechanisms.
            let rl = CFRunLoopGetMain();
            let mut context: CFRunLoopSourceContext = mem::zeroed();
-            context.perform = event_loop_proxy_handler;
+            context.perform = Some(event_loop_proxy_handler);
            let source =
                CFRunLoopSourceCreate(ptr::null_mut(), CFIndex::max_value() - 1, &mut context);
            CFRunLoopAddSource(rl, source, kCFRunLoopCommonModes);
@@ -141,8 +142,10 @@ impl<T> Proxy<T> {
        }
    }

-    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed> {
-        self.sender.send(event).map_err(|_| EventLoopClosed)?;
+    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
+        self.sender
+            .send(event)
+            .map_err(|mpsc::SendError(x)| EventLoopClosed(x))?;
        unsafe {
            // let the main thread know there's a new event
            CFRunLoopSourceSignal(self.source);
--- a/src/platform_impl/macos/monitor.rs
+++ b/src/platform_impl/macos/monitor.rs
@@ -22,17 +22,46 @@ use core_video_sys::{
    CVDisplayLinkGetNominalOutputVideoRefreshPeriod, CVDisplayLinkRelease,
 };

-#[derive(Derivative)]
-#[derivative(Debug, Clone, PartialEq, Hash)]
+#[derive(Clone)]
 pub struct VideoMode {
    pub(crate) size: (u32, u32),
    pub(crate) bit_depth: u16,
    pub(crate) refresh_rate: u16,
    pub(crate) monitor: MonitorHandle,
-    #[derivative(Debug = "ignore", PartialEq = "ignore", Hash = "ignore")]
    pub(crate) native_mode: NativeDisplayMode,
 }

+impl PartialEq for VideoMode {
+    fn eq(&self, other: &Self) -> bool {
+        self.size == other.size
+            && self.bit_depth == other.bit_depth
+            && self.refresh_rate == other.refresh_rate
+            && self.monitor == other.monitor
+    }
+}
+
+impl Eq for VideoMode {}
+
+impl std::hash::Hash for VideoMode {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.size.hash(state);
+        self.bit_depth.hash(state);
+        self.refresh_rate.hash(state);
+        self.monitor.hash(state);
+    }
+}
+
+impl std::fmt::Debug for VideoMode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("VideoMode")
+            .field("size", &self.size)
+            .field("bit_depth", &self.bit_depth)
+            .field("refresh_rate", &self.refresh_rate)
+            .field("monitor", &self.monitor)
+            .finish()
+    }
+}
+
 pub struct NativeDisplayMode(pub ffi::CGDisplayModeRef);

 unsafe impl Send for NativeDisplayMode {}
@@ -219,7 +248,6 @@ impl MonitorHandle {
                assert!(!array.is_null(), "failed to get list of display modes");
                let array_count = CFArrayGetCount(array);
                let modes: Vec<_> = (0..array_count)
-                    .into_iter()
                    .map(move |i| {
                        let mode = CFArrayGetValueAtIndex(array, i) as *mut _;
                        ffi::CGDisplayModeRetain(mode);
--- a/src/platform_impl/macos/observer.rs
+++ b/src/platform_impl/macos/observer.rs
@@ -4,7 +4,6 @@ use crate::platform_impl::platform::{app_state::AppState, ffi};

 #[link(name = "CoreFoundation", kind = "framework")]
 extern "C" {
-    pub static kCFRunLoopDefaultMode: CFRunLoopMode;
    pub static kCFRunLoopCommonModes: CFRunLoopMode;

    pub fn CFRunLoopGetMain() -> CFRunLoopRef;
@@ -94,14 +93,14 @@ pub enum CFRunLoopTimerContext {}
 pub struct CFRunLoopSourceContext {
    pub version: CFIndex,
    pub info: *mut c_void,
-    pub retain: extern "C" fn(*const c_void) -> *const c_void,
-    pub release: extern "C" fn(*const c_void),
-    pub copyDescription: extern "C" fn(*const c_void) -> CFStringRef,
-    pub equal: extern "C" fn(*const c_void, *const c_void) -> ffi::Boolean,
-    pub hash: extern "C" fn(*const c_void) -> CFHashCode,
-    pub schedule: extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode),
-    pub cancel: extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode),
-    pub perform: extern "C" fn(*mut c_void),
+    pub retain: Option<extern "C" fn(*const c_void) -> *const c_void>,
+    pub release: Option<extern "C" fn(*const c_void)>,
+    pub copyDescription: Option<extern "C" fn(*const c_void) -> CFStringRef>,
+    pub equal: Option<extern "C" fn(*const c_void, *const c_void) -> ffi::Boolean>,
+    pub hash: Option<extern "C" fn(*const c_void) -> CFHashCode>,
+    pub schedule: Option<extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode)>,
+    pub cancel: Option<extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode)>,
+    pub perform: Option<extern "C" fn(*mut c_void)>,
 }

 // begin is queued with the highest priority to ensure it is processed before other observers
@@ -162,7 +161,7 @@ impl RunLoop {
            handler,
            ptr::null_mut(),
        );
-        CFRunLoopAddObserver(self.0, observer, kCFRunLoopDefaultMode);
+        CFRunLoopAddObserver(self.0, observer, kCFRunLoopCommonModes);
    }
 }

--- a/src/platform_impl/macos/util/async.rs
+++ b/src/platform_impl/macos/util/async.rs
@@ -231,6 +231,21 @@ pub unsafe fn toggle_full_screen_async(
    );
 }

+extern "C" fn restore_display_mode_callback(screen: *mut c_void) {
+    unsafe {
+        let screen = Box::from_raw(screen as *mut u32);
+        ffi::CGRestorePermanentDisplayConfiguration();
+        assert_eq!(ffi::CGDisplayRelease(*screen), ffi::kCGErrorSuccess);
+    }
+}
+pub unsafe fn restore_display_mode_async(ns_screen: u32) {
+    dispatch_async_f(
+        dispatch_get_main_queue(),
+        Box::into_raw(Box::new(ns_screen)) as *mut _,
+        restore_display_mode_callback,
+    );
+}
+
 struct SetMaximizedData {
    ns_window: id,
    is_zoomed: bool,
--- a/src/platform_impl/macos/util/cursor.rs
+++ b/src/platform_impl/macos/util/cursor.rs
@@ -15,10 +15,12 @@ pub enum Cursor {

 impl From<CursorIcon> for Cursor {
    fn from(cursor: CursorIcon) -> Self {
+        // See native cursors at https://developer.apple.com/documentation/appkit/nscursor?language=objc.
        match cursor {
            CursorIcon::Arrow | CursorIcon::Default => Cursor::Native("arrowCursor"),
            CursorIcon::Hand => Cursor::Native("pointingHandCursor"),
-            CursorIcon::Grabbing | CursorIcon::Grab => Cursor::Native("closedHandCursor"),
+            CursorIcon::Grab => Cursor::Native("openHandCursor"),
+            CursorIcon::Grabbing => Cursor::Native("closedHandCursor"),
            CursorIcon::Text => Cursor::Native("IBeamCursor"),
            CursorIcon::VerticalText => Cursor::Native("IBeamCursorForVerticalLayout"),
            CursorIcon::Copy => Cursor::Native("dragCopyCursor"),
--- a/src/platform_impl/macos/view.rs
+++ b/src/platform_impl/macos/view.rs
@@ -452,7 +452,7 @@ extern "C" fn insert_text(this: &Object, _sel: Sel, string: id, _replacement_ran
        //let event: id = msg_send![NSApp(), currentEvent];

        let mut events = VecDeque::with_capacity(characters.len());
-        for character in string.chars() {
+        for character in string.chars().filter(|c| !is_corporate_character(*c)) {
            events.push_back(Event::WindowEvent {
                window_id: WindowId(get_window_id(state.ns_window)),
                event: WindowEvent::ReceivedCharacter(character),
@@ -484,7 +484,10 @@ extern "C" fn do_command_by_selector(this: &Object, _sel: Sel, command: Sel) {
        } else {
            let raw_characters = state.raw_characters.take();
            if let Some(raw_characters) = raw_characters {
-                for character in raw_characters.chars() {
+                for character in raw_characters
+                    .chars()
+                    .filter(|c| !is_corporate_character(*c))
+                {
                    events.push_back(Event::WindowEvent {
                        window_id: WindowId(get_window_id(state.ns_window)),
                        event: WindowEvent::ReceivedCharacter(character),
@@ -515,15 +518,27 @@ fn get_characters(event: id, ignore_modifiers: bool) -> String {
    }
 }

+// As defined in: https://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/CORPCHAR.TXT
+fn is_corporate_character(c: char) -> bool {
+    match c {
+        '\u{F700}'..='\u{F747}'
+        | '\u{F802}'..='\u{F84F}'
+        | '\u{F850}'
+        | '\u{F85C}'
+        | '\u{F85D}'
+        | '\u{F85F}'
+        | '\u{F860}'..='\u{F86B}'
+        | '\u{F870}'..='\u{F8FF}' => true,
+        _ => false,
+    }
+}
+
 // Retrieves a layout-independent keycode given an event.
 fn retrieve_keycode(event: id) -> Option<VirtualKeyCode> {
    #[inline]
    fn get_code(ev: id, raw: bool) -> Option<VirtualKeyCode> {
        let characters = get_characters(ev, raw);
-        characters
-            .chars()
-            .next()
-            .map_or(None, |c| char_to_keycode(c))
+        characters.chars().next().and_then(|c| char_to_keycode(c))
    }

    // Cmd switches Roman letters for Dvorak-QWERTY layout, so we try modified characters first.
@@ -567,6 +582,7 @@ extern "C" fn key_down(this: &Object, _sel: Sel, event: id) {
                    virtual_keycode,
                    modifiers: event_mods(event),
                },
+                is_synthetic: false,
            },
        };

@@ -574,7 +590,7 @@ extern "C" fn key_down(this: &Object, _sel: Sel, event: id) {
            AppState::queue_event(window_event);
            // Emit `ReceivedCharacter` for key repeats
            if is_repeat && state.is_key_down {
-                for character in characters.chars() {
+                for character in characters.chars().filter(|c| !is_corporate_character(*c)) {
                    AppState::queue_event(Event::WindowEvent {
                        window_id,
                        event: WindowEvent::ReceivedCharacter(character),
@@ -618,6 +634,7 @@ extern "C" fn key_up(this: &Object, _sel: Sel, event: id) {
                    virtual_keycode,
                    modifiers: event_mods(event),
                },
+                is_synthetic: false,
            },
        };

@@ -726,6 +743,7 @@ extern "C" fn cancel_operation(this: &Object, _sel: Sel, _sender: id) {
                    virtual_keycode,
                    modifiers: event_mods(event),
                },
+                is_synthetic: false,
            },
        };

--- a/src/platform_impl/macos/window.rs
+++ b/src/platform_impl/macos/window.rs
@@ -617,25 +617,6 @@ impl UnownedWindow {
        self.set_maximized(maximized);
    }

-    fn restore_display_mode(&self) {
-        trace!("Locked shared state in `restore_display_mode`");
-        let shared_state_lock = self.shared_state.lock().unwrap();
-
-        if let Some(Fullscreen::Exclusive(RootVideoMode { ref video_mode })) =
-            shared_state_lock.fullscreen
-        {
-            unsafe {
-                ffi::CGRestorePermanentDisplayConfiguration();
-                assert_eq!(
-                    ffi::CGDisplayRelease(video_mode.monitor().inner.native_identifier()),
-                    ffi::kCGErrorSuccess
-                );
-            }
-        }
-
-        trace!("Unlocked shared state in `restore_display_mode`");
-    }
-
    #[inline]
    pub fn set_maximized(&self, maximized: bool) {
        let is_zoomed = self.is_zoomed();
@@ -763,7 +744,39 @@ impl UnownedWindow {
            }
        }

+        trace!("Locked shared state in `set_fullscreen`");
+        let mut shared_state_lock = self.shared_state.lock().unwrap();
+        shared_state_lock.fullscreen = fullscreen.clone();
+        trace!("Unlocked shared state in `set_fullscreen`");
+
        match (&old_fullscreen, &fullscreen) {
+            (&None, &Some(_)) => unsafe {
+                util::toggle_full_screen_async(
+                    *self.ns_window,
+                    *self.ns_view,
+                    old_fullscreen.is_none(),
+                    Arc::downgrade(&self.shared_state),
+                );
+            },
+            (&Some(Fullscreen::Borderless(_)), &None) => unsafe {
+                // State is restored by `window_did_exit_fullscreen`
+                util::toggle_full_screen_async(
+                    *self.ns_window,
+                    *self.ns_view,
+                    old_fullscreen.is_none(),
+                    Arc::downgrade(&self.shared_state),
+                );
+            },
+            (&Some(Fullscreen::Exclusive(RootVideoMode { ref video_mode })), &None) => unsafe {
+                util::restore_display_mode_async(video_mode.monitor().inner.native_identifier());
+                // Rest of the state is restored by `window_did_exit_fullscreen`
+                util::toggle_full_screen_async(
+                    *self.ns_window,
+                    *self.ns_view,
+                    old_fullscreen.is_none(),
+                    Arc::downgrade(&self.shared_state),
+                );
+            },
            (&Some(Fullscreen::Borderless(_)), &Some(Fullscreen::Exclusive(_))) => unsafe {
                // If we're already in fullscreen mode, calling
                // `CGDisplayCapture` will place the shielding window on top of
@@ -773,39 +786,16 @@ impl UnownedWindow {
                // of the menu bar, and this looks broken, so we must make sure
                // that the menu bar is disabled. This is done in the window
                // delegate in `window:willUseFullScreenPresentationOptions:`.
-                msg_send![*self.ns_window, setLevel: ffi::CGShieldingWindowLevel() + 1];
+                let () = msg_send![*self.ns_window, setLevel: ffi::CGShieldingWindowLevel() + 1];
            },
-            (&Some(Fullscreen::Exclusive(_)), &None) => unsafe {
-                self.restore_display_mode();
-
-                util::toggle_full_screen_async(
-                    *self.ns_window,
-                    *self.ns_view,
-                    old_fullscreen.is_none(),
-                    Arc::downgrade(&self.shared_state),
-                );
-            },
-            (&Some(Fullscreen::Exclusive(_)), &Some(Fullscreen::Borderless(_))) => {
-                self.restore_display_mode();
-            }
-            (&None, &Some(Fullscreen::Exclusive(_)))
-            | (&None, &Some(Fullscreen::Borderless(_)))
-            | (&Some(Fullscreen::Borderless(_)), &None) => unsafe {
-                // Wish it were this simple for all cases
-                util::toggle_full_screen_async(
-                    *self.ns_window,
-                    *self.ns_view,
-                    old_fullscreen.is_none(),
-                    Arc::downgrade(&self.shared_state),
-                );
+            (
+                &Some(Fullscreen::Exclusive(RootVideoMode { ref video_mode })),
+                &Some(Fullscreen::Borderless(_)),
+            ) => unsafe {
+                util::restore_display_mode_async(video_mode.monitor().inner.native_identifier());
            },
            _ => (),
        }
-
-        trace!("Locked shared state in `set_fullscreen`");
-        let mut shared_state_lock = self.shared_state.lock().unwrap();
-        shared_state_lock.fullscreen = fullscreen.clone();
-        trace!("Unlocked shared state in `set_fullscreen`");
    }

    #[inline]
--- a/src/platform_impl/macos/window_delegate.rs
+++ b/src/platform_impl/macos/window_delegate.rs
@@ -84,11 +84,7 @@ impl WindowDelegateState {
    pub fn emit_resize_event(&mut self) {
        let rect = unsafe { NSView::frame(*self.ns_view) };
        let size = LogicalSize::new(rect.size.width as f64, rect.size.height as f64);
-        let event = Event::WindowEvent {
-            window_id: WindowId(get_window_id(*self.ns_window)),
-            event: WindowEvent::Resized(size),
-        };
-        AppState::send_event_immediately(event);
+        self.emit_event(WindowEvent::Resized(size));
    }

    fn emit_move_event(&mut self) {
@@ -406,7 +402,24 @@ extern "C" fn window_will_enter_fullscreen(this: &Object, _: Sel, _: id) {
    with_state(this, |state| {
        state.with_window(|window| {
            trace!("Locked shared state in `window_will_enter_fullscreen`");
-            window.shared_state.lock().unwrap().maximized = window.is_zoomed();
+            let mut shared_state = window.shared_state.lock().unwrap();
+            shared_state.maximized = window.is_zoomed();
+            match shared_state.fullscreen {
+                // Exclusive mode sets the state in `set_fullscreen` as the user
+                // can't enter exclusive mode by other means (like the
+                // fullscreen button on the window decorations)
+                Some(Fullscreen::Exclusive(_)) => (),
+                // `window_will_enter_fullscreen` was triggered and we're already
+                // in fullscreen, so we must've reached here by `set_fullscreen`
+                // as it updates the state
+                Some(Fullscreen::Borderless(_)) => (),
+                // Otherwise, we must've reached fullscreen by the user clicking
+                // on the green fullscreen button. Update state!
+                None => {
+                    shared_state.fullscreen = Some(Fullscreen::Borderless(window.current_monitor()))
+                }
+            }
+
            trace!("Unlocked shared state in `window_will_enter_fullscreen`");
        })
    });
@@ -437,25 +450,6 @@ extern "C" fn window_will_use_fullscreen_presentation_options(
 extern "C" fn window_did_enter_fullscreen(this: &Object, _: Sel, _: id) {
    trace!("Triggered `windowDidEnterFullscreen:`");
    with_state(this, |state| {
-        state.with_window(|window| {
-            let monitor = window.current_monitor();
-            trace!("Locked shared state in `window_did_enter_fullscreen`");
-            let mut shared_state = window.shared_state.lock().unwrap();
-            match shared_state.fullscreen {
-                // Exclusive mode sets the state in `set_fullscreen` as the user
-                // can't enter exclusive mode by other means (like the
-                // fullscreen button on the window decorations)
-                Some(Fullscreen::Exclusive(_)) => (),
-                // `window_did_enter_fullscreen` was triggered and we're already
-                // in fullscreen, so we must've reached here by `set_fullscreen`
-                // as it updates the state
-                Some(Fullscreen::Borderless(_)) => (),
-                // Otherwise, we must've reached fullscreen by the user clicking
-                // on the green fullscreen button. Update state!
-                None => shared_state.fullscreen = Some(Fullscreen::Borderless(monitor)),
-            }
-            trace!("Unlocked shared state in `window_did_enter_fullscreen`");
-        });
        state.initial_fullscreen = false;
    });
    trace!("Completed `windowDidEnterFullscreen:`");
--- a/src/platform_impl/mod.rs
+++ b/src/platform_impl/mod.rs
@@ -21,8 +21,8 @@ mod platform;
 #[cfg(target_os = "ios")]
 #[path = "ios/mod.rs"]
 mod platform;
-#[cfg(target_os = "emscripten")]
-#[path = "emscripten/mod.rs"]
+#[cfg(target_arch = "wasm32")]
+#[path = "web/mod.rs"]
 mod platform;

 #[cfg(all(
@@ -35,6 +35,6 @@ mod platform;
    not(target_os = "freebsd"),
    not(target_os = "netbsd"),
    not(target_os = "openbsd"),
-    not(target_os = "emscripten")
+    not(target_arch = "wasm32"),
 ))]
 compile_error!("The platform you're compiling for is not supported by winit");
--- a/src/platform_impl/web/device.rs
+++ b/src/platform_impl/web/device.rs
@@ -0,0 +1,8 @@
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Id(pub i32);
+
+impl Id {
+    pub unsafe fn dummy() -> Self {
+        Id(0)
+    }
+}
--- a/src/platform_impl/web/error.rs
+++ b/src/platform_impl/web/error.rs
@@ -0,0 +1,10 @@
+use std::fmt;
+
+#[derive(Debug)]
+pub struct OsError(pub String);
+
+impl fmt::Display for OsError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
--- a/src/platform_impl/web/event_loop/mod.rs
+++ b/src/platform_impl/web/event_loop/mod.rs
@@ -0,0 +1,67 @@
+mod proxy;
+mod runner;
+mod state;
+mod window_target;
+
+pub use self::proxy::Proxy;
+pub use self::window_target::WindowTarget;
+
+use super::{backend, device, monitor, window};
+use crate::event::Event;
+use crate::event_loop as root;
+
+use std::collections::{vec_deque::IntoIter as VecDequeIter, VecDeque};
+use std::marker::PhantomData;
+
+pub struct EventLoop<T: 'static> {
+    elw: root::EventLoopWindowTarget<T>,
+}
+
+impl<T> EventLoop<T> {
+    pub fn new() -> Self {
+        EventLoop {
+            elw: root::EventLoopWindowTarget {
+                p: WindowTarget::new(),
+                _marker: PhantomData,
+            },
+        }
+    }
+
+    pub fn available_monitors(&self) -> VecDequeIter<monitor::Handle> {
+        VecDeque::new().into_iter()
+    }
+
+    pub fn primary_monitor(&self) -> monitor::Handle {
+        monitor::Handle
+    }
+
+    pub fn run<F>(self, mut event_handler: F) -> !
+    where
+        F: 'static + FnMut(Event<T>, &root::EventLoopWindowTarget<T>, &mut root::ControlFlow),
+    {
+        let target = root::EventLoopWindowTarget {
+            p: self.elw.p.clone(),
+            _marker: PhantomData,
+        };
+
+        self.elw.p.run(Box::new(move |event, flow| {
+            event_handler(event, &target, flow)
+        }));
+
+        // Throw an exception to break out of Rust exceution and use unreachable to tell the
+        // compiler this function won't return, giving it a return type of '!'
+        backend::throw(
+            "Using exceptions for control flow, don't mind me. This isn't actually an error!",
+        );
+
+        unreachable!();
+    }
+
+    pub fn create_proxy(&self) -> Proxy<T> {
+        self.elw.p.proxy()
+    }
+
+    pub fn window_target(&self) -> &root::EventLoopWindowTarget<T> {
+        &self.elw
+    }
+}
--- a/src/platform_impl/web/event_loop/proxy.rs
+++ b/src/platform_impl/web/event_loop/proxy.rs
@@ -0,0 +1,26 @@
+use super::runner;
+use crate::event::Event;
+use crate::event_loop::EventLoopClosed;
+
+pub struct Proxy<T: 'static> {
+    runner: runner::Shared<T>,
+}
+
+impl<T: 'static> Proxy<T> {
+    pub fn new(runner: runner::Shared<T>) -> Self {
+        Proxy { runner }
+    }
+
+    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
+        self.runner.send_event(Event::UserEvent(event));
+        Ok(())
+    }
+}
+
+impl<T: 'static> Clone for Proxy<T> {
+    fn clone(&self) -> Self {
+        Proxy {
+            runner: self.runner.clone(),
+        }
+    }
+}
--- a/src/platform_impl/web/event_loop/runner.rs
+++ b/src/platform_impl/web/event_loop/runner.rs
@@ -0,0 +1,254 @@
+use super::{backend, state::State};
+use crate::event::{Event, StartCause, WindowEvent};
+use crate::event_loop as root;
+use crate::window::WindowId;
+
+use instant::{Duration, Instant};
+use std::{
+    cell::RefCell,
+    clone::Clone,
+    collections::{HashSet, VecDeque},
+    rc::Rc,
+};
+
+pub struct Shared<T>(Rc<Execution<T>>);
+
+impl<T> Clone for Shared<T> {
+    fn clone(&self) -> Self {
+        Shared(self.0.clone())
+    }
+}
+
+pub struct Execution<T> {
+    runner: RefCell<Option<Runner<T>>>,
+    events: RefCell<VecDeque<Event<T>>>,
+    id: RefCell<u32>,
+    redraw_pending: RefCell<HashSet<WindowId>>,
+}
+
+struct Runner<T> {
+    state: State,
+    is_busy: bool,
+    event_handler: Box<dyn FnMut(Event<T>, &mut root::ControlFlow)>,
+}
+
+impl<T: 'static> Runner<T> {
+    pub fn new(event_handler: Box<dyn FnMut(Event<T>, &mut root::ControlFlow)>) -> Self {
+        Runner {
+            state: State::Init,
+            is_busy: false,
+            event_handler,
+        }
+    }
+}
+
+impl<T: 'static> Shared<T> {
+    pub fn new() -> Self {
+        Shared(Rc::new(Execution {
+            runner: RefCell::new(None),
+            events: RefCell::new(VecDeque::new()),
+            id: RefCell::new(0),
+            redraw_pending: RefCell::new(HashSet::new()),
+        }))
+    }
+
+    // Set the event callback to use for the event loop runner
+    // This the event callback is a fairly thin layer over the user-provided callback that closes
+    // over a RootEventLoopWindowTarget reference
+    pub fn set_listener(&self, event_handler: Box<dyn FnMut(Event<T>, &mut root::ControlFlow)>) {
+        self.0.runner.replace(Some(Runner::new(event_handler)));
+        self.send_event(Event::NewEvents(StartCause::Init));
+
+        let close_instance = self.clone();
+        backend::on_unload(move || close_instance.handle_unload());
+    }
+
+    // Generate a strictly increasing ID
+    // This is used to differentiate windows when handling events
+    pub fn generate_id(&self) -> u32 {
+        let mut id = self.0.id.borrow_mut();
+        *id += 1;
+
+        *id
+    }
+
+    pub fn request_redraw(&self, id: WindowId) {
+        self.0.redraw_pending.borrow_mut().insert(id);
+    }
+
+    // Add an event to the event loop runner
+    //
+    // It will determine if the event should be immediately sent to the user or buffered for later
+    pub fn send_event(&self, event: Event<T>) {
+        // If the event loop is closed, it should discard any new events
+        if self.is_closed() {
+            return;
+        }
+
+        // Determine if event handling is in process, and then release the borrow on the runner
+        let (start_cause, event_is_start) = match *self.0.runner.borrow() {
+            Some(ref runner) if !runner.is_busy => {
+                if let Event::NewEvents(cause) = event {
+                    (cause, true)
+                } else {
+                    (
+                        match runner.state {
+                            State::Init => StartCause::Init,
+                            State::Poll { .. } => StartCause::Poll,
+                            State::Wait { start } => StartCause::WaitCancelled {
+                                start,
+                                requested_resume: None,
+                            },
+                            State::WaitUntil { start, end, .. } => StartCause::WaitCancelled {
+                                start,
+                                requested_resume: Some(end),
+                            },
+                            State::Exit => {
+                                return;
+                            }
+                        },
+                        false,
+                    )
+                }
+            }
+            _ => {
+                // Events are currently being handled, so queue this one and don't try to
+                // double-process the event queue
+                self.0.events.borrow_mut().push_back(event);
+                return;
+            }
+        };
+        let mut control = self.current_control_flow();
+        // Handle starting a new batch of events
+        //
+        // The user is informed via Event::NewEvents that there is a batch of events to process
+        // However, there is only one of these per batch of events
+        self.handle_event(Event::NewEvents(start_cause), &mut control);
+        if !event_is_start {
+            self.handle_event(event, &mut control);
+        }
+        // Collect all of the redraw events to avoid double-locking the RefCell
+        let redraw_events: Vec<WindowId> = self.0.redraw_pending.borrow_mut().drain().collect();
+        for window_id in redraw_events {
+            self.handle_event(
+                Event::WindowEvent {
+                    window_id,
+                    event: WindowEvent::RedrawRequested,
+                },
+                &mut control,
+            );
+        }
+        self.handle_event(Event::EventsCleared, &mut control);
+        self.apply_control_flow(control);
+        // If the event loop is closed, it has been closed this iteration and now the closing
+        // event should be emitted
+        if self.is_closed() {
+            self.handle_event(Event::LoopDestroyed, &mut control);
+        }
+    }
+
+    fn handle_unload(&self) {
+        self.apply_control_flow(root::ControlFlow::Exit);
+        let mut control = self.current_control_flow();
+        self.handle_event(Event::LoopDestroyed, &mut control);
+    }
+
+    // handle_event takes in events and either queues them or applies a callback
+    //
+    // It should only ever be called from send_event
+    fn handle_event(&self, event: Event<T>, control: &mut root::ControlFlow) {
+        let is_closed = self.is_closed();
+
+        match *self.0.runner.borrow_mut() {
+            Some(ref mut runner) => {
+                // An event is being processed, so the runner should be marked busy
+                runner.is_busy = true;
+
+                (runner.event_handler)(event, control);
+
+                // Maintain closed state, even if the callback changes it
+                if is_closed {
+                    *control = root::ControlFlow::Exit;
+                }
+
+                // An event is no longer being processed
+                runner.is_busy = false;
+            }
+            // If an event is being handled without a runner somehow, add it to the event queue so
+            // it will eventually be processed
+            _ => self.0.events.borrow_mut().push_back(event),
+        }
+
+        // Don't take events out of the queue if the loop is closed or the runner doesn't exist
+        // If the runner doesn't exist and this method recurses, it will recurse infinitely
+        if !is_closed && self.0.runner.borrow().is_some() {
+            // Take an event out of the queue and handle it
+            if let Some(event) = self.0.events.borrow_mut().pop_front() {
+                self.handle_event(event, control);
+            }
+        }
+    }
+
+    // Apply the new ControlFlow that has been selected by the user
+    // Start any necessary timeouts etc
+    fn apply_control_flow(&self, control_flow: root::ControlFlow) {
+        let new_state = match control_flow {
+            root::ControlFlow::Poll => {
+                let cloned = self.clone();
+                State::Poll {
+                    timeout: backend::Timeout::new(
+                        move || cloned.send_event(Event::NewEvents(StartCause::Poll)),
+                        Duration::from_millis(0),
+                    ),
+                }
+            }
+            root::ControlFlow::Wait => State::Wait {
+                start: Instant::now(),
+            },
+            root::ControlFlow::WaitUntil(end) => {
+                let start = Instant::now();
+
+                let delay = if end <= start {
+                    Duration::from_millis(0)
+                } else {
+                    end - start
+                };
+
+                let cloned = self.clone();
+
+                State::WaitUntil {
+                    start,
+                    end,
+                    timeout: backend::Timeout::new(
+                        move || cloned.send_event(Event::NewEvents(StartCause::Poll)),
+                        delay,
+                    ),
+                }
+            }
+            root::ControlFlow::Exit => State::Exit,
+        };
+
+        match *self.0.runner.borrow_mut() {
+            Some(ref mut runner) => {
+                runner.state = new_state;
+            }
+            None => (),
+        }
+    }
+
+    // Check if the event loop is currently closed
+    fn is_closed(&self) -> bool {
+        match *self.0.runner.borrow() {
+            Some(ref runner) => runner.state.is_exit(),
+            None => false, // If the event loop is None, it has not been intialised yet, so it cannot be closed
+        }
+    }
+
+    // Get the current control flow state
+    fn current_control_flow(&self) -> root::ControlFlow {
+        match *self.0.runner.borrow() {
+            Some(ref runner) => runner.state.control_flow(),
+            None => root::ControlFlow::Poll,
+        }
+    }
+}
--- a/src/platform_impl/web/event_loop/state.rs
+++ b/src/platform_impl/web/event_loop/state.rs
@@ -0,0 +1,40 @@
+use super::backend;
+use crate::event_loop::ControlFlow;
+
+use instant::Instant;
+
+#[derive(Debug)]
+pub enum State {
+    Init,
+    WaitUntil {
+        timeout: backend::Timeout,
+        start: Instant,
+        end: Instant,
+    },
+    Wait {
+        start: Instant,
+    },
+    Poll {
+        timeout: backend::Timeout,
+    },
+    Exit,
+}
+
+impl State {
+    pub fn is_exit(&self) -> bool {
+        match self {
+            State::Exit => true,
+            _ => false,
+        }
+    }
+
+    pub fn control_flow(&self) -> ControlFlow {
+        match self {
+            State::Init => ControlFlow::Poll,
+            State::WaitUntil { end, .. } => ControlFlow::WaitUntil(*end),
+            State::Wait { .. } => ControlFlow::Wait,
+            State::Poll { .. } => ControlFlow::Poll,
+            State::Exit => ControlFlow::Exit,
+        }
+    }
+}
--- a/src/platform_impl/web/event_loop/window_target.rs
+++ b/src/platform_impl/web/event_loop/window_target.rs
@@ -0,0 +1,199 @@
+use super::{backend, device, proxy::Proxy, runner, window};
+use crate::dpi::LogicalSize;
+use crate::event::{DeviceId, ElementState, Event, KeyboardInput, TouchPhase, WindowEvent};
+use crate::event_loop::ControlFlow;
+use crate::window::WindowId;
+use std::clone::Clone;
+
+pub struct WindowTarget<T: 'static> {
+    pub(crate) runner: runner::Shared<T>,
+}
+
+impl<T> Clone for WindowTarget<T> {
+    fn clone(&self) -> Self {
+        WindowTarget {
+            runner: self.runner.clone(),
+        }
+    }
+}
+
+impl<T> WindowTarget<T> {
+    pub fn new() -> Self {
+        WindowTarget {
+            runner: runner::Shared::new(),
+        }
+    }
+
+    pub fn proxy(&self) -> Proxy<T> {
+        Proxy::new(self.runner.clone())
+    }
+
+    pub fn run(&self, event_handler: Box<dyn FnMut(Event<T>, &mut ControlFlow)>) {
+        self.runner.set_listener(event_handler);
+    }
+
+    pub fn generate_id(&self) -> window::Id {
+        window::Id(self.runner.generate_id())
+    }
+
+    pub fn register(&self, canvas: &mut backend::Canvas, id: window::Id) {
+        let runner = self.runner.clone();
+        canvas.set_attribute("data-raw-handle", &id.0.to_string());
+
+        canvas.on_blur(move || {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::Focused(false),
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_focus(move || {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::Focused(true),
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_keyboard_press(move |scancode, virtual_keycode, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::KeyboardInput {
+                    device_id: DeviceId(unsafe { device::Id::dummy() }),
+                    input: KeyboardInput {
+                        scancode,
+                        state: ElementState::Pressed,
+                        virtual_keycode,
+                        modifiers,
+                    },
+                    is_synthetic: false,
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_keyboard_release(move |scancode, virtual_keycode, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::KeyboardInput {
+                    device_id: DeviceId(unsafe { device::Id::dummy() }),
+                    input: KeyboardInput {
+                        scancode,
+                        state: ElementState::Released,
+                        virtual_keycode,
+                        modifiers,
+                    },
+                    is_synthetic: false,
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_received_character(move |char_code| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::ReceivedCharacter(char_code),
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_cursor_leave(move |pointer_id| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::CursorLeft {
+                    device_id: DeviceId(device::Id(pointer_id)),
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_cursor_enter(move |pointer_id| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::CursorEntered {
+                    device_id: DeviceId(device::Id(pointer_id)),
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_cursor_move(move |pointer_id, position, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::CursorMoved {
+                    device_id: DeviceId(device::Id(pointer_id)),
+                    position,
+                    modifiers,
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_mouse_press(move |pointer_id, button, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::MouseInput {
+                    device_id: DeviceId(device::Id(pointer_id)),
+                    state: ElementState::Pressed,
+                    button,
+                    modifiers,
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_mouse_release(move |pointer_id, button, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::MouseInput {
+                    device_id: DeviceId(device::Id(pointer_id)),
+                    state: ElementState::Released,
+                    button,
+                    modifiers,
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_mouse_wheel(move |pointer_id, delta, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::MouseWheel {
+                    device_id: DeviceId(device::Id(pointer_id)),
+                    delta,
+                    phase: TouchPhase::Moved,
+                    modifiers,
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        let raw = canvas.raw().clone();
+        let mut intended_size = LogicalSize {
+            width: raw.width() as f64,
+            height: raw.height() as f64,
+        };
+        canvas.on_fullscreen_change(move || {
+            // If the canvas is marked as fullscreen, it is moving *into* fullscreen
+            // If it is not, it is moving *out of* fullscreen
+            let new_size = if backend::is_fullscreen(&raw) {
+                intended_size = LogicalSize {
+                    width: raw.width() as f64,
+                    height: raw.height() as f64,
+                };
+
+                backend::window_size()
+            } else {
+                intended_size
+            };
+            raw.set_width(new_size.width as u32);
+            raw.set_height(new_size.height as u32);
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(id),
+                event: WindowEvent::Resized(new_size),
+            });
+            runner.request_redraw(WindowId(id));
+        });
+    }
+}
--- a/src/platform_impl/web/mod.rs
+++ b/src/platform_impl/web/mod.rs
@@ -0,0 +1,31 @@
+// TODO: close events (port from old stdweb branch)
+// TODO: pointer locking (stdweb PR required)
+// TODO: fullscreen API (stdweb PR required)
+
+mod device;
+mod error;
+mod event_loop;
+mod monitor;
+mod window;
+
+#[cfg(feature = "web-sys")]
+#[path = "web_sys/mod.rs"]
+mod backend;
+
+#[cfg(feature = "stdweb")]
+#[path = "stdweb/mod.rs"]
+mod backend;
+
+#[cfg(not(any(feature = "web-sys", feature = "stdweb")))]
+compile_error!("Please select a feature to build for web: `web-sys`, `stdweb`");
+
+pub use self::device::Id as DeviceId;
+pub use self::error::OsError;
+pub use self::event_loop::{
+    EventLoop, Proxy as EventLoopProxy, WindowTarget as EventLoopWindowTarget,
+};
+pub use self::monitor::{Handle as MonitorHandle, Mode as VideoMode};
+pub use self::window::{
+    Id as WindowId, PlatformSpecificBuilderAttributes as PlatformSpecificWindowBuilderAttributes,
+    Window,
+};
--- a/src/platform_impl/web/monitor.rs
+++ b/src/platform_impl/web/monitor.rs
@@ -0,0 +1,51 @@
+use crate::dpi::{PhysicalPosition, PhysicalSize};
+use crate::monitor::{MonitorHandle, VideoMode};
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Handle;
+
+impl Handle {
+    pub fn hidpi_factor(&self) -> f64 {
+        1.0
+    }
+
+    pub fn position(&self) -> PhysicalPosition {
+        PhysicalPosition { x: 0.0, y: 0.0 }
+    }
+
+    pub fn name(&self) -> Option<String> {
+        None
+    }
+
+    pub fn size(&self) -> PhysicalSize {
+        PhysicalSize {
+            width: 0.0,
+            height: 0.0,
+        }
+    }
+
+    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
+        std::iter::empty()
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct Mode;
+
+impl Mode {
+    pub fn size(&self) -> PhysicalSize {
+        unimplemented!();
+    }
+
+    pub fn bit_depth(&self) -> u16 {
+        unimplemented!();
+    }
+
+    pub fn refresh_rate(&self) -> u16 {
+        32
+    }
+
+    pub fn monitor(&self) -> MonitorHandle {
+        MonitorHandle { inner: Handle }
+    }
+}
--- a/src/platform_impl/web/stdweb/canvas.rs
+++ b/src/platform_impl/web/stdweb/canvas.rs
@@ -0,0 +1,282 @@
+use super::event;
+use crate::dpi::{LogicalPosition, LogicalSize};
+use crate::error::OsError as RootOE;
+use crate::event::{ModifiersState, MouseButton, MouseScrollDelta, ScanCode, VirtualKeyCode};
+use crate::platform_impl::OsError;
+
+use std::cell::RefCell;
+use std::rc::Rc;
+use stdweb::traits::IPointerEvent;
+use stdweb::unstable::TryInto;
+use stdweb::web::event::{
+    BlurEvent, ConcreteEvent, FocusEvent, FullscreenChangeEvent, KeyDownEvent, KeyPressEvent,
+    KeyUpEvent, MouseWheelEvent, PointerDownEvent, PointerMoveEvent, PointerOutEvent,
+    PointerOverEvent, PointerUpEvent,
+};
+use stdweb::web::html_element::CanvasElement;
+use stdweb::web::{
+    document, EventListenerHandle, IChildNode, IElement, IEventTarget, IHtmlElement,
+};
+
+pub struct Canvas {
+    raw: CanvasElement,
+    on_focus: Option<EventListenerHandle>,
+    on_blur: Option<EventListenerHandle>,
+    on_keyboard_release: Option<EventListenerHandle>,
+    on_keyboard_press: Option<EventListenerHandle>,
+    on_received_character: Option<EventListenerHandle>,
+    on_cursor_leave: Option<EventListenerHandle>,
+    on_cursor_enter: Option<EventListenerHandle>,
+    on_cursor_move: Option<EventListenerHandle>,
+    on_mouse_press: Option<EventListenerHandle>,
+    on_mouse_release: Option<EventListenerHandle>,
+    on_mouse_wheel: Option<EventListenerHandle>,
+    on_fullscreen_change: Option<EventListenerHandle>,
+    wants_fullscreen: Rc<RefCell<bool>>,
+}
+
+impl Drop for Canvas {
+    fn drop(&mut self) {
+        self.raw.remove();
+    }
+}
+
+impl Canvas {
+    pub fn create() -> Result<Self, RootOE> {
+        let canvas: CanvasElement = document()
+            .create_element("canvas")
+            .map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?
+            .try_into()
+            .map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?;
+
+        // A tabindex is needed in order to capture local keyboard events.
+        // A "0" value means that the element should be focusable in
+        // sequential keyboard navigation, but its order is defined by the
+        // document's source order.
+        // https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex
+        canvas
+            .set_attribute("tabindex", "0")
+            .map_err(|_| os_error!(OsError("Failed to set a tabindex".to_owned())))?;
+
+        Ok(Canvas {
+            raw: canvas,
+            on_blur: None,
+            on_focus: None,
+            on_keyboard_release: None,
+            on_keyboard_press: None,
+            on_received_character: None,
+            on_cursor_leave: None,
+            on_cursor_enter: None,
+            on_cursor_move: None,
+            on_mouse_release: None,
+            on_mouse_press: None,
+            on_mouse_wheel: None,
+            on_fullscreen_change: None,
+            wants_fullscreen: Rc::new(RefCell::new(false)),
+        })
+    }
+
+    pub fn set_attribute(&self, attribute: &str, value: &str) {
+        self.raw
+            .set_attribute(attribute, value)
+            .expect(&format!("Set attribute: {}", attribute));
+    }
+
+    pub fn position(&self) -> (f64, f64) {
+        let bounds = self.raw.get_bounding_client_rect();
+
+        (bounds.get_x(), bounds.get_y())
+    }
+
+    pub fn width(&self) -> f64 {
+        self.raw.width() as f64
+    }
+
+    pub fn height(&self) -> f64 {
+        self.raw.height() as f64
+    }
+
+    pub fn set_size(&self, size: LogicalSize) {
+        self.raw.set_width(size.width as u32);
+        self.raw.set_height(size.height as u32);
+    }
+
+    pub fn raw(&self) -> &CanvasElement {
+        &self.raw
+    }
+
+    pub fn on_blur<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(),
+    {
+        self.on_blur = Some(self.add_event(move |_: BlurEvent| {
+            handler();
+        }));
+    }
+
+    pub fn on_focus<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(),
+    {
+        self.on_focus = Some(self.add_event(move |_: FocusEvent| {
+            handler();
+        }));
+    }
+
+    pub fn on_keyboard_release<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(ScanCode, Option<VirtualKeyCode>, ModifiersState),
+    {
+        self.on_keyboard_release = Some(self.add_user_event(move |event: KeyUpEvent| {
+            handler(
+                event::scan_code(&event),
+                event::virtual_key_code(&event),
+                event::keyboard_modifiers(&event),
+            );
+        }));
+    }
+
+    pub fn on_keyboard_press<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(ScanCode, Option<VirtualKeyCode>, ModifiersState),
+    {
+        self.on_keyboard_press = Some(self.add_user_event(move |event: KeyDownEvent| {
+            handler(
+                event::scan_code(&event),
+                event::virtual_key_code(&event),
+                event::keyboard_modifiers(&event),
+            );
+        }));
+    }
+
+    pub fn on_received_character<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(char),
+    {
+        // TODO: Use `beforeinput`.
+        //
+        // The `keypress` event is deprecated, but there does not seem to be a
+        // viable/compatible alternative as of now. `beforeinput` is still widely
+        // unsupported.
+        self.on_received_character = Some(self.add_user_event(move |event: KeyPressEvent| {
+            handler(event::codepoint(&event));
+        }));
+    }
+
+    pub fn on_cursor_leave<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32),
+    {
+        self.on_cursor_leave = Some(self.add_event(move |event: PointerOutEvent| {
+            handler(event.pointer_id());
+        }));
+    }
+
+    pub fn on_cursor_enter<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32),
+    {
+        self.on_cursor_enter = Some(self.add_event(move |event: PointerOverEvent| {
+            handler(event.pointer_id());
+        }));
+    }
+
+    pub fn on_mouse_release<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32, MouseButton, ModifiersState),
+    {
+        self.on_mouse_release = Some(self.add_user_event(move |event: PointerUpEvent| {
+            handler(
+                event.pointer_id(),
+                event::mouse_button(&event),
+                event::mouse_modifiers(&event),
+            );
+        }));
+    }
+
+    pub fn on_mouse_press<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32, MouseButton, ModifiersState),
+    {
+        self.on_mouse_press = Some(self.add_user_event(move |event: PointerDownEvent| {
+            handler(
+                event.pointer_id(),
+                event::mouse_button(&event),
+                event::mouse_modifiers(&event),
+            );
+        }));
+    }
+
+    pub fn on_cursor_move<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32, LogicalPosition, ModifiersState),
+    {
+        self.on_cursor_move = Some(self.add_event(move |event: PointerMoveEvent| {
+            handler(
+                event.pointer_id(),
+                event::mouse_position(&event),
+                event::mouse_modifiers(&event),
+            );
+        }));
+    }
+
+    pub fn on_mouse_wheel<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32, MouseScrollDelta, ModifiersState),
+    {
+        self.on_mouse_wheel = Some(self.add_event(move |event: MouseWheelEvent| {
+            if let Some(delta) = event::mouse_scroll_delta(&event) {
+                handler(0, delta, event::mouse_modifiers(&event));
+            }
+        }));
+    }
+
+    pub fn on_fullscreen_change<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(),
+    {
+        self.on_fullscreen_change = Some(self.add_event(move |_: FullscreenChangeEvent| handler()));
+    }
+
+    fn add_event<E, F>(&self, mut handler: F) -> EventListenerHandle
+    where
+        E: ConcreteEvent,
+        F: 'static + FnMut(E),
+    {
+        self.raw.add_event_listener(move |event: E| {
+            event.stop_propagation();
+            event.cancel_bubble();
+
+            handler(event);
+        })
+    }
+
+    // The difference between add_event and add_user_event is that the latter has a special meaning
+    // for browser security. A user event is a deliberate action by the user (like a mouse or key
+    // press) and is the only time things like a fullscreen request may be successfully completed.)
+    fn add_user_event<E, F>(&self, mut handler: F) -> EventListenerHandle
+    where
+        E: ConcreteEvent,
+        F: 'static + FnMut(E),
+    {
+        let wants_fullscreen = self.wants_fullscreen.clone();
+        let canvas = self.raw.clone();
+
+        self.add_event(move |event: E| {
+            handler(event);
+
+            if *wants_fullscreen.borrow() {
+                canvas.request_fullscreen();
+                *wants_fullscreen.borrow_mut() = false;
+            }
+        })
+    }
+
+    pub fn request_fullscreen(&self) {
+        *self.wants_fullscreen.borrow_mut() = true;
+    }
+
+    pub fn is_fullscreen(&self) -> bool {
+        super::is_fullscreen(&self.raw)
+    }
+}
--- a/src/platform_impl/web/stdweb/event.rs
+++ b/src/platform_impl/web/stdweb/event.rs
@@ -0,0 +1,229 @@
+use crate::dpi::LogicalPosition;
+use crate::event::{ModifiersState, MouseButton, MouseScrollDelta, ScanCode, VirtualKeyCode};
+
+use stdweb::web::event::{IKeyboardEvent, IMouseEvent, MouseWheelDeltaMode, MouseWheelEvent};
+use stdweb::{js, unstable::TryInto, JsSerialize};
+
+pub fn mouse_button(event: &impl IMouseEvent) -> MouseButton {
+    match event.button() {
+        stdweb::web::event::MouseButton::Left => MouseButton::Left,
+        stdweb::web::event::MouseButton::Right => MouseButton::Right,
+        stdweb::web::event::MouseButton::Wheel => MouseButton::Middle,
+        stdweb::web::event::MouseButton::Button4 => MouseButton::Other(0),
+        stdweb::web::event::MouseButton::Button5 => MouseButton::Other(1),
+    }
+}
+
+pub fn mouse_modifiers(event: &impl IMouseEvent) -> ModifiersState {
+    ModifiersState {
+        shift: event.shift_key(),
+        ctrl: event.ctrl_key(),
+        alt: event.alt_key(),
+        logo: event.meta_key(),
+    }
+}
+
+pub fn mouse_position(event: &impl IMouseEvent) -> LogicalPosition {
+    LogicalPosition {
+        x: event.offset_x() as f64,
+        y: event.offset_y() as f64,
+    }
+}
+
+pub fn mouse_scroll_delta(event: &MouseWheelEvent) -> Option<MouseScrollDelta> {
+    let x = event.delta_x();
+    let y = event.delta_y();
+
+    match event.delta_mode() {
+        MouseWheelDeltaMode::Line => Some(MouseScrollDelta::LineDelta(x as f32, y as f32)),
+        MouseWheelDeltaMode::Pixel => Some(MouseScrollDelta::PixelDelta(LogicalPosition { x, y })),
+        MouseWheelDeltaMode::Page => None,
+    }
+}
+
+pub fn scan_code<T: JsSerialize>(event: &T) -> ScanCode {
+    let key_code = js! ( return @{event}.keyCode; );
+
+    key_code
+        .try_into()
+        .expect("The which value should be a number")
+}
+
+pub fn virtual_key_code(event: &impl IKeyboardEvent) -> Option<VirtualKeyCode> {
+    Some(match &event.code()[..] {
+        "Digit1" => VirtualKeyCode::Key1,
+        "Digit2" => VirtualKeyCode::Key2,
+        "Digit3" => VirtualKeyCode::Key3,
+        "Digit4" => VirtualKeyCode::Key4,
+        "Digit5" => VirtualKeyCode::Key5,
+        "Digit6" => VirtualKeyCode::Key6,
+        "Digit7" => VirtualKeyCode::Key7,
+        "Digit8" => VirtualKeyCode::Key8,
+        "Digit9" => VirtualKeyCode::Key9,
+        "Digit0" => VirtualKeyCode::Key0,
+        "KeyA" => VirtualKeyCode::A,
+        "KeyB" => VirtualKeyCode::B,
+        "KeyC" => VirtualKeyCode::C,
+        "KeyD" => VirtualKeyCode::D,
+        "KeyE" => VirtualKeyCode::E,
+        "KeyF" => VirtualKeyCode::F,
+        "KeyG" => VirtualKeyCode::G,
+        "KeyH" => VirtualKeyCode::H,
+        "KeyI" => VirtualKeyCode::I,
+        "KeyJ" => VirtualKeyCode::J,
+        "KeyK" => VirtualKeyCode::K,
+        "KeyL" => VirtualKeyCode::L,
+        "KeyM" => VirtualKeyCode::M,
+        "KeyN" => VirtualKeyCode::N,
+        "KeyO" => VirtualKeyCode::O,
+        "KeyP" => VirtualKeyCode::P,
+        "KeyQ" => VirtualKeyCode::Q,
+        "KeyR" => VirtualKeyCode::R,
+        "KeyS" => VirtualKeyCode::S,
+        "KeyT" => VirtualKeyCode::T,
+        "KeyU" => VirtualKeyCode::U,
+        "KeyV" => VirtualKeyCode::V,
+        "KeyW" => VirtualKeyCode::W,
+        "KeyX" => VirtualKeyCode::X,
+        "KeyY" => VirtualKeyCode::Y,
+        "KeyZ" => VirtualKeyCode::Z,
+        "Escape" => VirtualKeyCode::Escape,
+        "F1" => VirtualKeyCode::F1,
+        "F2" => VirtualKeyCode::F2,
+        "F3" => VirtualKeyCode::F3,
+        "F4" => VirtualKeyCode::F4,
+        "F5" => VirtualKeyCode::F5,
+        "F6" => VirtualKeyCode::F6,
+        "F7" => VirtualKeyCode::F7,
+        "F8" => VirtualKeyCode::F8,
+        "F9" => VirtualKeyCode::F9,
+        "F10" => VirtualKeyCode::F10,
+        "F11" => VirtualKeyCode::F11,
+        "F12" => VirtualKeyCode::F12,
+        "F13" => VirtualKeyCode::F13,
+        "F14" => VirtualKeyCode::F14,
+        "F15" => VirtualKeyCode::F15,
+        "F16" => VirtualKeyCode::F16,
+        "F17" => VirtualKeyCode::F17,
+        "F18" => VirtualKeyCode::F18,
+        "F19" => VirtualKeyCode::F19,
+        "F20" => VirtualKeyCode::F20,
+        "F21" => VirtualKeyCode::F21,
+        "F22" => VirtualKeyCode::F22,
+        "F23" => VirtualKeyCode::F23,
+        "F24" => VirtualKeyCode::F24,
+        "PrintScreen" => VirtualKeyCode::Snapshot,
+        "ScrollLock" => VirtualKeyCode::Scroll,
+        "Pause" => VirtualKeyCode::Pause,
+        "Insert" => VirtualKeyCode::Insert,
+        "Home" => VirtualKeyCode::Home,
+        "Delete" => VirtualKeyCode::Delete,
+        "End" => VirtualKeyCode::End,
+        "PageDown" => VirtualKeyCode::PageDown,
+        "PageUp" => VirtualKeyCode::PageUp,
+        "ArrowLeft" => VirtualKeyCode::Left,
+        "ArrowUp" => VirtualKeyCode::Up,
+        "ArrowRight" => VirtualKeyCode::Right,
+        "ArrowDown" => VirtualKeyCode::Down,
+        "Backspace" => VirtualKeyCode::Back,
+        "Enter" => VirtualKeyCode::Return,
+        "Space" => VirtualKeyCode::Space,
+        "Compose" => VirtualKeyCode::Compose,
+        "Caret" => VirtualKeyCode::Caret,
+        "NumLock" => VirtualKeyCode::Numlock,
+        "Numpad0" => VirtualKeyCode::Numpad0,
+        "Numpad1" => VirtualKeyCode::Numpad1,
+        "Numpad2" => VirtualKeyCode::Numpad2,
+        "Numpad3" => VirtualKeyCode::Numpad3,
+        "Numpad4" => VirtualKeyCode::Numpad4,
+        "Numpad5" => VirtualKeyCode::Numpad5,
+        "Numpad6" => VirtualKeyCode::Numpad6,
+        "Numpad7" => VirtualKeyCode::Numpad7,
+        "Numpad8" => VirtualKeyCode::Numpad8,
+        "Numpad9" => VirtualKeyCode::Numpad9,
+        "AbntC1" => VirtualKeyCode::AbntC1,
+        "AbntC2" => VirtualKeyCode::AbntC2,
+        "NumpadAdd" => VirtualKeyCode::Add,
+        "Quote" => VirtualKeyCode::Apostrophe,
+        "Apps" => VirtualKeyCode::Apps,
+        "At" => VirtualKeyCode::At,
+        "Ax" => VirtualKeyCode::Ax,
+        "Backslash" => VirtualKeyCode::Backslash,
+        "Calculator" => VirtualKeyCode::Calculator,
+        "Capital" => VirtualKeyCode::Capital,
+        "Semicolon" => VirtualKeyCode::Semicolon,
+        "Comma" => VirtualKeyCode::Comma,
+        "Convert" => VirtualKeyCode::Convert,
+        "NumpadDecimal" => VirtualKeyCode::Decimal,
+        "NumpadDivide" => VirtualKeyCode::Divide,
+        "Equal" => VirtualKeyCode::Equals,
+        "Backquote" => VirtualKeyCode::Grave,
+        "Kana" => VirtualKeyCode::Kana,
+        "Kanji" => VirtualKeyCode::Kanji,
+        "AltLeft" => VirtualKeyCode::LAlt,
+        "BracketLeft" => VirtualKeyCode::LBracket,
+        "ControlLeft" => VirtualKeyCode::LControl,
+        "ShiftLeft" => VirtualKeyCode::LShift,
+        "MetaLeft" => VirtualKeyCode::LWin,
+        "Mail" => VirtualKeyCode::Mail,
+        "MediaSelect" => VirtualKeyCode::MediaSelect,
+        "MediaStop" => VirtualKeyCode::MediaStop,
+        "Minus" => VirtualKeyCode::Minus,
+        "NumpadMultiply" => VirtualKeyCode::Multiply,
+        "Mute" => VirtualKeyCode::Mute,
+        "LaunchMyComputer" => VirtualKeyCode::MyComputer,
+        "NavigateForward" => VirtualKeyCode::NavigateForward,
+        "NavigateBackward" => VirtualKeyCode::NavigateBackward,
+        "NextTrack" => VirtualKeyCode::NextTrack,
+        "NoConvert" => VirtualKeyCode::NoConvert,
+        "NumpadComma" => VirtualKeyCode::NumpadComma,
+        "NumpadEnter" => VirtualKeyCode::NumpadEnter,
+        "NumpadEquals" => VirtualKeyCode::NumpadEquals,
+        "OEM102" => VirtualKeyCode::OEM102,
+        "Period" => VirtualKeyCode::Period,
+        "PlayPause" => VirtualKeyCode::PlayPause,
+        "Power" => VirtualKeyCode::Power,
+        "PrevTrack" => VirtualKeyCode::PrevTrack,
+        "AltRight" => VirtualKeyCode::RAlt,
+        "BracketRight" => VirtualKeyCode::RBracket,
+        "ControlRight" => VirtualKeyCode::RControl,
+        "ShiftRight" => VirtualKeyCode::RShift,
+        "MetaRight" => VirtualKeyCode::RWin,
+        "Slash" => VirtualKeyCode::Slash,
+        "Sleep" => VirtualKeyCode::Sleep,
+        "Stop" => VirtualKeyCode::Stop,
+        "NumpadSubtract" => VirtualKeyCode::Subtract,
+        "Sysrq" => VirtualKeyCode::Sysrq,
+        "Tab" => VirtualKeyCode::Tab,
+        "Underline" => VirtualKeyCode::Underline,
+        "Unlabeled" => VirtualKeyCode::Unlabeled,
+        "AudioVolumeDown" => VirtualKeyCode::VolumeDown,
+        "AudioVolumeUp" => VirtualKeyCode::VolumeUp,
+        "Wake" => VirtualKeyCode::Wake,
+        "WebBack" => VirtualKeyCode::WebBack,
+        "WebFavorites" => VirtualKeyCode::WebFavorites,
+        "WebForward" => VirtualKeyCode::WebForward,
+        "WebHome" => VirtualKeyCode::WebHome,
+        "WebRefresh" => VirtualKeyCode::WebRefresh,
+        "WebSearch" => VirtualKeyCode::WebSearch,
+        "WebStop" => VirtualKeyCode::WebStop,
+        "Yen" => VirtualKeyCode::Yen,
+        _ => return None,
+    })
+}
+
+pub fn keyboard_modifiers(event: &impl IKeyboardEvent) -> ModifiersState {
+    ModifiersState {
+        shift: event.shift_key(),
+        ctrl: event.ctrl_key(),
+        alt: event.alt_key(),
+        logo: event.meta_key(),
+    }
+}
+
+pub fn codepoint(event: &impl IKeyboardEvent) -> char {
+    // `event.key()` always returns a non-empty `String`. Therefore, this should
+    // never panic.
+    // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key
+    event.key().chars().next().unwrap()
+}
--- a/src/platform_impl/web/stdweb/mod.rs
+++ b/src/platform_impl/web/stdweb/mod.rs
@@ -0,0 +1,52 @@
+mod canvas;
+mod event;
+mod timeout;
+
+pub use self::canvas::Canvas;
+pub use self::timeout::Timeout;
+
+use crate::dpi::LogicalSize;
+use crate::platform::web::WindowExtStdweb;
+use crate::window::Window;
+
+use stdweb::js;
+use stdweb::web::event::BeforeUnloadEvent;
+use stdweb::web::window;
+use stdweb::web::IEventTarget;
+use stdweb::web::{document, html_element::CanvasElement, Element};
+
+pub fn throw(msg: &str) {
+    js! { throw @{msg} }
+}
+
+pub fn exit_fullscreen() {
+    document().exit_fullscreen();
+}
+
+pub fn on_unload(mut handler: impl FnMut() + 'static) {
+    window().add_event_listener(move |_: BeforeUnloadEvent| handler());
+}
+
+impl WindowExtStdweb for Window {
+    fn canvas(&self) -> CanvasElement {
+        self.window.canvas().raw().clone()
+    }
+}
+
+pub fn window_size() -> LogicalSize {
+    let window = window();
+    let width = window.inner_width() as f64;
+    let height = window.inner_height() as f64;
+
+    LogicalSize { width, height }
+}
+
+pub fn is_fullscreen(canvas: &CanvasElement) -> bool {
+    match document().fullscreen_element() {
+        Some(elem) => {
+            let raw: Element = canvas.clone().into();
+            raw == elem
+        }
+        None => false,
+    }
+}
--- a/src/platform_impl/web/stdweb/timeout.rs
+++ b/src/platform_impl/web/stdweb/timeout.rs
@@ -0,0 +1,25 @@
+use std::time::Duration;
+use stdweb::web::{window, IWindowOrWorker, TimeoutHandle};
+
+#[derive(Debug)]
+pub struct Timeout {
+    handle: TimeoutHandle,
+}
+
+impl Timeout {
+    pub fn new<F>(f: F, duration: Duration) -> Timeout
+    where
+        F: 'static + FnMut(),
+    {
+        Timeout {
+            handle: window().set_clearable_timeout(f, duration.as_millis() as u32),
+        }
+    }
+}
+
+impl Drop for Timeout {
+    fn drop(&mut self) {
+        let handle = std::mem::replace(&mut self.handle, unsafe { std::mem::uninitialized() });
+        handle.clear();
+    }
+}
--- a/src/platform_impl/web/web_sys/canvas.rs
+++ b/src/platform_impl/web/web_sys/canvas.rs
@@ -0,0 +1,303 @@
+use super::event;
+use crate::dpi::{LogicalPosition, LogicalSize};
+use crate::error::OsError as RootOE;
+use crate::event::{ModifiersState, MouseButton, MouseScrollDelta, ScanCode, VirtualKeyCode};
+use crate::platform_impl::OsError;
+
+use std::cell::RefCell;
+use std::rc::Rc;
+
+use wasm_bindgen::{closure::Closure, JsCast};
+use web_sys::{Event, FocusEvent, HtmlCanvasElement, KeyboardEvent, PointerEvent, WheelEvent};
+
+pub struct Canvas {
+    raw: HtmlCanvasElement,
+    on_focus: Option<Closure<dyn FnMut(FocusEvent)>>,
+    on_blur: Option<Closure<dyn FnMut(FocusEvent)>>,
+    on_keyboard_release: Option<Closure<dyn FnMut(KeyboardEvent)>>,
+    on_keyboard_press: Option<Closure<dyn FnMut(KeyboardEvent)>>,
+    on_received_character: Option<Closure<dyn FnMut(KeyboardEvent)>>,
+    on_cursor_leave: Option<Closure<dyn FnMut(PointerEvent)>>,
+    on_cursor_enter: Option<Closure<dyn FnMut(PointerEvent)>>,
+    on_cursor_move: Option<Closure<dyn FnMut(PointerEvent)>>,
+    on_mouse_press: Option<Closure<dyn FnMut(PointerEvent)>>,
+    on_mouse_release: Option<Closure<dyn FnMut(PointerEvent)>>,
+    on_mouse_wheel: Option<Closure<dyn FnMut(WheelEvent)>>,
+    on_fullscreen_change: Option<Closure<dyn FnMut(Event)>>,
+    wants_fullscreen: Rc<RefCell<bool>>,
+}
+
+impl Drop for Canvas {
+    fn drop(&mut self) {
+        self.raw.remove();
+    }
+}
+
+impl Canvas {
+    pub fn create() -> Result<Self, RootOE> {
+        let window =
+            web_sys::window().ok_or(os_error!(OsError("Failed to obtain window".to_owned())))?;
+
+        let document = window
+            .document()
+            .ok_or(os_error!(OsError("Failed to obtain document".to_owned())))?;
+
+        let canvas: HtmlCanvasElement = document
+            .create_element("canvas")
+            .map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?
+            .unchecked_into();
+
+        // A tabindex is needed in order to capture local keyboard events.
+        // A "0" value means that the element should be focusable in
+        // sequential keyboard navigation, but its order is defined by the
+        // document's source order.
+        // https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex
+        canvas
+            .set_attribute("tabindex", "0")
+            .map_err(|_| os_error!(OsError("Failed to set a tabindex".to_owned())))?;
+
+        Ok(Canvas {
+            raw: canvas,
+            on_blur: None,
+            on_focus: None,
+            on_keyboard_release: None,
+            on_keyboard_press: None,
+            on_received_character: None,
+            on_cursor_leave: None,
+            on_cursor_enter: None,
+            on_cursor_move: None,
+            on_mouse_release: None,
+            on_mouse_press: None,
+            on_mouse_wheel: None,
+            on_fullscreen_change: None,
+            wants_fullscreen: Rc::new(RefCell::new(false)),
+        })
+    }
+
+    pub fn set_attribute(&self, attribute: &str, value: &str) {
+        self.raw
+            .set_attribute(attribute, value)
+            .expect(&format!("Set attribute: {}", attribute));
+    }
+
+    pub fn position(&self) -> (f64, f64) {
+        let bounds = self.raw.get_bounding_client_rect();
+
+        (bounds.x(), bounds.y())
+    }
+
+    pub fn width(&self) -> f64 {
+        self.raw.width() as f64
+    }
+
+    pub fn height(&self) -> f64 {
+        self.raw.height() as f64
+    }
+
+    pub fn set_size(&self, size: LogicalSize) {
+        self.raw.set_width(size.width as u32);
+        self.raw.set_height(size.height as u32);
+    }
+
+    pub fn raw(&self) -> &HtmlCanvasElement {
+        &self.raw
+    }
+
+    pub fn on_blur<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(),
+    {
+        self.on_blur = Some(self.add_event("blur", move |_: FocusEvent| {
+            handler();
+        }));
+    }
+
+    pub fn on_focus<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(),
+    {
+        self.on_focus = Some(self.add_event("focus", move |_: FocusEvent| {
+            handler();
+        }));
+    }
+
+    pub fn on_keyboard_release<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(ScanCode, Option<VirtualKeyCode>, ModifiersState),
+    {
+        self.on_keyboard_release =
+            Some(self.add_user_event("keyup", move |event: KeyboardEvent| {
+                handler(
+                    event::scan_code(&event),
+                    event::virtual_key_code(&event),
+                    event::keyboard_modifiers(&event),
+                );
+            }));
+    }
+
+    pub fn on_keyboard_press<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(ScanCode, Option<VirtualKeyCode>, ModifiersState),
+    {
+        self.on_keyboard_press =
+            Some(self.add_user_event("keydown", move |event: KeyboardEvent| {
+                handler(
+                    event::scan_code(&event),
+                    event::virtual_key_code(&event),
+                    event::keyboard_modifiers(&event),
+                );
+            }));
+    }
+
+    pub fn on_received_character<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(char),
+    {
+        // TODO: Use `beforeinput`.
+        //
+        // The `keypress` event is deprecated, but there does not seem to be a
+        // viable/compatible alternative as of now. `beforeinput` is still widely
+        // unsupported.
+        self.on_received_character = Some(self.add_user_event(
+            "keypress",
+            move |event: KeyboardEvent| {
+                handler(event::codepoint(&event));
+            },
+        ));
+    }
+
+    pub fn on_cursor_leave<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32),
+    {
+        self.on_cursor_leave = Some(self.add_event("pointerout", move |event: PointerEvent| {
+            handler(event.pointer_id());
+        }));
+    }
+
+    pub fn on_cursor_enter<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32),
+    {
+        self.on_cursor_enter = Some(self.add_event("pointerover", move |event: PointerEvent| {
+            handler(event.pointer_id());
+        }));
+    }
+
+    pub fn on_mouse_release<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32, MouseButton, ModifiersState),
+    {
+        self.on_mouse_release = Some(self.add_user_event(
+            "pointerup",
+            move |event: PointerEvent| {
+                handler(
+                    event.pointer_id(),
+                    event::mouse_button(&event),
+                    event::mouse_modifiers(&event),
+                );
+            },
+        ));
+    }
+
+    pub fn on_mouse_press<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32, MouseButton, ModifiersState),
+    {
+        self.on_mouse_press = Some(self.add_user_event(
+            "pointerdown",
+            move |event: PointerEvent| {
+                handler(
+                    event.pointer_id(),
+                    event::mouse_button(&event),
+                    event::mouse_modifiers(&event),
+                );
+            },
+        ));
+    }
+
+    pub fn on_cursor_move<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32, LogicalPosition, ModifiersState),
+    {
+        self.on_cursor_move = Some(self.add_event("pointermove", move |event: PointerEvent| {
+            handler(
+                event.pointer_id(),
+                event::mouse_position(&event),
+                event::mouse_modifiers(&event),
+            );
+        }));
+    }
+
+    pub fn on_mouse_wheel<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(i32, MouseScrollDelta, ModifiersState),
+    {
+        self.on_mouse_wheel = Some(self.add_event("wheel", move |event: WheelEvent| {
+            if let Some(delta) = event::mouse_scroll_delta(&event) {
+                handler(0, delta, event::mouse_modifiers(&event));
+            }
+        }));
+    }
+
+    pub fn on_fullscreen_change<F>(&mut self, mut handler: F)
+    where
+        F: 'static + FnMut(),
+    {
+        self.on_fullscreen_change =
+            Some(self.add_event("fullscreenchange", move |_: Event| handler()));
+    }
+
+    fn add_event<E, F>(&self, event_name: &str, mut handler: F) -> Closure<dyn FnMut(E)>
+    where
+        E: 'static + AsRef<web_sys::Event> + wasm_bindgen::convert::FromWasmAbi,
+        F: 'static + FnMut(E),
+    {
+        let closure = Closure::wrap(Box::new(move |event: E| {
+            {
+                let event_ref = event.as_ref();
+                event_ref.stop_propagation();
+                event_ref.cancel_bubble();
+            }
+
+            handler(event);
+        }) as Box<dyn FnMut(E)>);
+
+        self.raw
+            .add_event_listener_with_callback(event_name, &closure.as_ref().unchecked_ref())
+            .expect("Failed to add event listener with callback");
+
+        closure
+    }
+
+    // The difference between add_event and add_user_event is that the latter has a special meaning
+    // for browser security. A user event is a deliberate action by the user (like a mouse or key
+    // press) and is the only time things like a fullscreen request may be successfully completed.)
+    fn add_user_event<E, F>(&self, event_name: &str, mut handler: F) -> Closure<dyn FnMut(E)>
+    where
+        E: 'static + AsRef<web_sys::Event> + wasm_bindgen::convert::FromWasmAbi,
+        F: 'static + FnMut(E),
+    {
+        let wants_fullscreen = self.wants_fullscreen.clone();
+        let canvas = self.raw.clone();
+
+        self.add_event(event_name, move |event: E| {
+            handler(event);
+
+            if *wants_fullscreen.borrow() {
+                canvas
+                    .request_fullscreen()
+                    .expect("Failed to enter fullscreen");
+                *wants_fullscreen.borrow_mut() = false;
+            }
+        })
+    }
+
+    pub fn request_fullscreen(&self) {
+        *self.wants_fullscreen.borrow_mut() = true;
+    }
+
+    pub fn is_fullscreen(&self) -> bool {
+        super::is_fullscreen(&self.raw)
+    }
+}
--- a/src/platform_impl/web/web_sys/event.rs
+++ b/src/platform_impl/web/web_sys/event.rs
@@ -0,0 +1,227 @@
+use crate::dpi::LogicalPosition;
+use crate::event::{ModifiersState, MouseButton, MouseScrollDelta, ScanCode, VirtualKeyCode};
+
+use std::convert::TryInto;
+use web_sys::{KeyboardEvent, MouseEvent, WheelEvent};
+
+pub fn mouse_button(event: &MouseEvent) -> MouseButton {
+    match event.button() {
+        0 => MouseButton::Left,
+        1 => MouseButton::Middle,
+        2 => MouseButton::Right,
+        i => MouseButton::Other((i - 3).try_into().expect("very large mouse button value")),
+    }
+}
+
+pub fn mouse_modifiers(event: &MouseEvent) -> ModifiersState {
+    ModifiersState {
+        shift: event.shift_key(),
+        ctrl: event.ctrl_key(),
+        alt: event.alt_key(),
+        logo: event.meta_key(),
+    }
+}
+
+pub fn mouse_position(event: &MouseEvent) -> LogicalPosition {
+    LogicalPosition {
+        x: event.offset_x() as f64,
+        y: event.offset_y() as f64,
+    }
+}
+
+pub fn mouse_scroll_delta(event: &WheelEvent) -> Option<MouseScrollDelta> {
+    let x = event.delta_x();
+    let y = event.delta_y();
+
+    match event.delta_mode() {
+        WheelEvent::DOM_DELTA_LINE => Some(MouseScrollDelta::LineDelta(x as f32, y as f32)),
+        WheelEvent::DOM_DELTA_PIXEL => Some(MouseScrollDelta::PixelDelta(LogicalPosition { x, y })),
+        _ => None,
+    }
+}
+
+pub fn scan_code(event: &KeyboardEvent) -> ScanCode {
+    match event.key_code() {
+        0 => event.char_code(),
+        i => i,
+    }
+}
+
+pub fn virtual_key_code(event: &KeyboardEvent) -> Option<VirtualKeyCode> {
+    Some(match &event.code()[..] {
+        "Digit1" => VirtualKeyCode::Key1,
+        "Digit2" => VirtualKeyCode::Key2,
+        "Digit3" => VirtualKeyCode::Key3,
+        "Digit4" => VirtualKeyCode::Key4,
+        "Digit5" => VirtualKeyCode::Key5,
+        "Digit6" => VirtualKeyCode::Key6,
+        "Digit7" => VirtualKeyCode::Key7,
+        "Digit8" => VirtualKeyCode::Key8,
+        "Digit9" => VirtualKeyCode::Key9,
+        "Digit0" => VirtualKeyCode::Key0,
+        "KeyA" => VirtualKeyCode::A,
+        "KeyB" => VirtualKeyCode::B,
+        "KeyC" => VirtualKeyCode::C,
+        "KeyD" => VirtualKeyCode::D,
+        "KeyE" => VirtualKeyCode::E,
+        "KeyF" => VirtualKeyCode::F,
+        "KeyG" => VirtualKeyCode::G,
+        "KeyH" => VirtualKeyCode::H,
+        "KeyI" => VirtualKeyCode::I,
+        "KeyJ" => VirtualKeyCode::J,
+        "KeyK" => VirtualKeyCode::K,
+        "KeyL" => VirtualKeyCode::L,
+        "KeyM" => VirtualKeyCode::M,
+        "KeyN" => VirtualKeyCode::N,
+        "KeyO" => VirtualKeyCode::O,
+        "KeyP" => VirtualKeyCode::P,
+        "KeyQ" => VirtualKeyCode::Q,
+        "KeyR" => VirtualKeyCode::R,
+        "KeyS" => VirtualKeyCode::S,
+        "KeyT" => VirtualKeyCode::T,
+        "KeyU" => VirtualKeyCode::U,
+        "KeyV" => VirtualKeyCode::V,
+        "KeyW" => VirtualKeyCode::W,
+        "KeyX" => VirtualKeyCode::X,
+        "KeyY" => VirtualKeyCode::Y,
+        "KeyZ" => VirtualKeyCode::Z,
+        "Escape" => VirtualKeyCode::Escape,
+        "F1" => VirtualKeyCode::F1,
+        "F2" => VirtualKeyCode::F2,
+        "F3" => VirtualKeyCode::F3,
+        "F4" => VirtualKeyCode::F4,
+        "F5" => VirtualKeyCode::F5,
+        "F6" => VirtualKeyCode::F6,
+        "F7" => VirtualKeyCode::F7,
+        "F8" => VirtualKeyCode::F8,
+        "F9" => VirtualKeyCode::F9,
+        "F10" => VirtualKeyCode::F10,
+        "F11" => VirtualKeyCode::F11,
+        "F12" => VirtualKeyCode::F12,
+        "F13" => VirtualKeyCode::F13,
+        "F14" => VirtualKeyCode::F14,
+        "F15" => VirtualKeyCode::F15,
+        "F16" => VirtualKeyCode::F16,
+        "F17" => VirtualKeyCode::F17,
+        "F18" => VirtualKeyCode::F18,
+        "F19" => VirtualKeyCode::F19,
+        "F20" => VirtualKeyCode::F20,
+        "F21" => VirtualKeyCode::F21,
+        "F22" => VirtualKeyCode::F22,
+        "F23" => VirtualKeyCode::F23,
+        "F24" => VirtualKeyCode::F24,
+        "PrintScreen" => VirtualKeyCode::Snapshot,
+        "ScrollLock" => VirtualKeyCode::Scroll,
+        "Pause" => VirtualKeyCode::Pause,
+        "Insert" => VirtualKeyCode::Insert,
+        "Home" => VirtualKeyCode::Home,
+        "Delete" => VirtualKeyCode::Delete,
+        "End" => VirtualKeyCode::End,
+        "PageDown" => VirtualKeyCode::PageDown,
+        "PageUp" => VirtualKeyCode::PageUp,
+        "ArrowLeft" => VirtualKeyCode::Left,
+        "ArrowUp" => VirtualKeyCode::Up,
+        "ArrowRight" => VirtualKeyCode::Right,
+        "ArrowDown" => VirtualKeyCode::Down,
+        "Backspace" => VirtualKeyCode::Back,
+        "Enter" => VirtualKeyCode::Return,
+        "Space" => VirtualKeyCode::Space,
+        "Compose" => VirtualKeyCode::Compose,
+        "Caret" => VirtualKeyCode::Caret,
+        "NumLock" => VirtualKeyCode::Numlock,
+        "Numpad0" => VirtualKeyCode::Numpad0,
+        "Numpad1" => VirtualKeyCode::Numpad1,
+        "Numpad2" => VirtualKeyCode::Numpad2,
+        "Numpad3" => VirtualKeyCode::Numpad3,
+        "Numpad4" => VirtualKeyCode::Numpad4,
+        "Numpad5" => VirtualKeyCode::Numpad5,
+        "Numpad6" => VirtualKeyCode::Numpad6,
+        "Numpad7" => VirtualKeyCode::Numpad7,
+        "Numpad8" => VirtualKeyCode::Numpad8,
+        "Numpad9" => VirtualKeyCode::Numpad9,
+        "AbntC1" => VirtualKeyCode::AbntC1,
+        "AbntC2" => VirtualKeyCode::AbntC2,
+        "NumpadAdd" => VirtualKeyCode::Add,
+        "Quote" => VirtualKeyCode::Apostrophe,
+        "Apps" => VirtualKeyCode::Apps,
+        "At" => VirtualKeyCode::At,
+        "Ax" => VirtualKeyCode::Ax,
+        "Backslash" => VirtualKeyCode::Backslash,
+        "Calculator" => VirtualKeyCode::Calculator,
+        "Capital" => VirtualKeyCode::Capital,
+        "Semicolon" => VirtualKeyCode::Semicolon,
+        "Comma" => VirtualKeyCode::Comma,
+        "Convert" => VirtualKeyCode::Convert,
+        "NumpadDecimal" => VirtualKeyCode::Decimal,
+        "NumpadDivide" => VirtualKeyCode::Divide,
+        "Equal" => VirtualKeyCode::Equals,
+        "Backquote" => VirtualKeyCode::Grave,
+        "Kana" => VirtualKeyCode::Kana,
+        "Kanji" => VirtualKeyCode::Kanji,
+        "AltLeft" => VirtualKeyCode::LAlt,
+        "BracketLeft" => VirtualKeyCode::LBracket,
+        "ControlLeft" => VirtualKeyCode::LControl,
+        "ShiftLeft" => VirtualKeyCode::LShift,
+        "MetaLeft" => VirtualKeyCode::LWin,
+        "Mail" => VirtualKeyCode::Mail,
+        "MediaSelect" => VirtualKeyCode::MediaSelect,
+        "MediaStop" => VirtualKeyCode::MediaStop,
+        "Minus" => VirtualKeyCode::Minus,
+        "NumpadMultiply" => VirtualKeyCode::Multiply,
+        "Mute" => VirtualKeyCode::Mute,
+        "LaunchMyComputer" => VirtualKeyCode::MyComputer,
+        "NavigateForward" => VirtualKeyCode::NavigateForward,
+        "NavigateBackward" => VirtualKeyCode::NavigateBackward,
+        "NextTrack" => VirtualKeyCode::NextTrack,
+        "NoConvert" => VirtualKeyCode::NoConvert,
+        "NumpadComma" => VirtualKeyCode::NumpadComma,
+        "NumpadEnter" => VirtualKeyCode::NumpadEnter,
+        "NumpadEquals" => VirtualKeyCode::NumpadEquals,
+        "OEM102" => VirtualKeyCode::OEM102,
+        "Period" => VirtualKeyCode::Period,
+        "PlayPause" => VirtualKeyCode::PlayPause,
+        "Power" => VirtualKeyCode::Power,
+        "PrevTrack" => VirtualKeyCode::PrevTrack,
+        "AltRight" => VirtualKeyCode::RAlt,
+        "BracketRight" => VirtualKeyCode::RBracket,
+        "ControlRight" => VirtualKeyCode::RControl,
+        "ShiftRight" => VirtualKeyCode::RShift,
+        "MetaRight" => VirtualKeyCode::RWin,
+        "Slash" => VirtualKeyCode::Slash,
+        "Sleep" => VirtualKeyCode::Sleep,
+        "Stop" => VirtualKeyCode::Stop,
+        "NumpadSubtract" => VirtualKeyCode::Subtract,
+        "Sysrq" => VirtualKeyCode::Sysrq,
+        "Tab" => VirtualKeyCode::Tab,
+        "Underline" => VirtualKeyCode::Underline,
+        "Unlabeled" => VirtualKeyCode::Unlabeled,
+        "AudioVolumeDown" => VirtualKeyCode::VolumeDown,
+        "AudioVolumeUp" => VirtualKeyCode::VolumeUp,
+        "Wake" => VirtualKeyCode::Wake,
+        "WebBack" => VirtualKeyCode::WebBack,
+        "WebFavorites" => VirtualKeyCode::WebFavorites,
+        "WebForward" => VirtualKeyCode::WebForward,
+        "WebHome" => VirtualKeyCode::WebHome,
+        "WebRefresh" => VirtualKeyCode::WebRefresh,
+        "WebSearch" => VirtualKeyCode::WebSearch,
+        "WebStop" => VirtualKeyCode::WebStop,
+        "Yen" => VirtualKeyCode::Yen,
+        _ => return None,
+    })
+}
+
+pub fn keyboard_modifiers(event: &KeyboardEvent) -> ModifiersState {
+    ModifiersState {
+        shift: event.shift_key(),
+        ctrl: event.ctrl_key(),
+        alt: event.alt_key(),
+        logo: event.meta_key(),
+    }
+}
+
+pub fn codepoint(event: &KeyboardEvent) -> char {
+    // `event.key()` always returns a non-empty `String`. Therefore, this should
+    // never panic.
+    // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key
+    event.key().chars().next().unwrap()
+}
--- a/src/platform_impl/web/web_sys/mod.rs
+++ b/src/platform_impl/web/web_sys/mod.rs
@@ -0,0 +1,70 @@
+mod canvas;
+mod event;
+mod timeout;
+
+pub use self::canvas::Canvas;
+pub use self::timeout::Timeout;
+
+use crate::dpi::LogicalSize;
+use crate::platform::web::WindowExtWebSys;
+use crate::window::Window;
+use wasm_bindgen::{closure::Closure, JsCast};
+use web_sys::{window, BeforeUnloadEvent, Element, HtmlCanvasElement};
+
+pub fn throw(msg: &str) {
+    wasm_bindgen::throw_str(msg);
+}
+
+pub fn exit_fullscreen() {
+    let window = web_sys::window().expect("Failed to obtain window");
+    let document = window.document().expect("Failed to obtain document");
+
+    document.exit_fullscreen();
+}
+
+pub fn on_unload(mut handler: impl FnMut() + 'static) {
+    let window = web_sys::window().expect("Failed to obtain window");
+
+    let closure = Closure::wrap(
+        Box::new(move |_: BeforeUnloadEvent| handler()) as Box<dyn FnMut(BeforeUnloadEvent)>
+    );
+
+    window
+        .add_event_listener_with_callback("beforeunload", &closure.as_ref().unchecked_ref())
+        .expect("Failed to add close listener");
+}
+
+impl WindowExtWebSys for Window {
+    fn canvas(&self) -> HtmlCanvasElement {
+        self.window.canvas().raw().clone()
+    }
+}
+
+pub fn window_size() -> LogicalSize {
+    let window = web_sys::window().expect("Failed to obtain window");
+    let width = window
+        .inner_width()
+        .expect("Failed to get width")
+        .as_f64()
+        .expect("Failed to get width as f64");
+    let height = window
+        .inner_height()
+        .expect("Failed to get height")
+        .as_f64()
+        .expect("Failed to get height as f64");
+
+    LogicalSize { width, height }
+}
+
+pub fn is_fullscreen(canvas: &HtmlCanvasElement) -> bool {
+    let window = window().expect("Failed to obtain window");
+    let document = window.document().expect("Failed to obtain document");
+
+    match document.fullscreen_element() {
+        Some(elem) => {
+            let raw: Element = canvas.clone().into();
+            raw == elem
+        }
+        None => false,
+    }
+}
--- a/src/platform_impl/web/web_sys/timeout.rs
+++ b/src/platform_impl/web/web_sys/timeout.rs
@@ -0,0 +1,40 @@
+use std::time::Duration;
+use wasm_bindgen::closure::Closure;
+use wasm_bindgen::JsCast;
+
+#[derive(Debug)]
+pub struct Timeout {
+    handle: i32,
+    _closure: Closure<dyn FnMut()>,
+}
+
+impl Timeout {
+    pub fn new<F>(f: F, duration: Duration) -> Timeout
+    where
+        F: 'static + FnMut(),
+    {
+        let window = web_sys::window().expect("Failed to obtain window");
+
+        let closure = Closure::wrap(Box::new(f) as Box<dyn FnMut()>);
+
+        let handle = window
+            .set_timeout_with_callback_and_timeout_and_arguments_0(
+                &closure.as_ref().unchecked_ref(),
+                duration.as_millis() as i32,
+            )
+            .expect("Failed to set timeout");
+
+        Timeout {
+            handle,
+            _closure: closure,
+        }
+    }
+}
+
+impl Drop for Timeout {
+    fn drop(&mut self) {
+        let window = web_sys::window().expect("Failed to obtain window");
+
+        window.clear_timeout_with_handle(self.handle);
+    }
+}
--- a/src/platform_impl/web/window.rs
+++ b/src/platform_impl/web/window.rs
@@ -0,0 +1,288 @@
+use crate::dpi::{LogicalPosition, LogicalSize};
+use crate::error::{ExternalError, NotSupportedError, OsError as RootOE};
+use crate::icon::Icon;
+use crate::monitor::MonitorHandle as RootMH;
+use crate::window::{CursorIcon, Fullscreen, WindowAttributes, WindowId as RootWI};
+
+use raw_window_handle::web::WebHandle;
+
+use super::{backend, monitor, EventLoopWindowTarget};
+
+use std::cell::RefCell;
+use std::collections::vec_deque::IntoIter as VecDequeIter;
+use std::collections::VecDeque;
+
+pub struct Window {
+    canvas: backend::Canvas,
+    previous_pointer: RefCell<&'static str>,
+    position: RefCell<LogicalPosition>,
+    id: Id,
+    register_redraw_request: Box<dyn Fn()>,
+}
+
+impl Window {
+    pub fn new<T>(
+        target: &EventLoopWindowTarget<T>,
+        attr: WindowAttributes,
+        _: PlatformSpecificBuilderAttributes,
+    ) -> Result<Self, RootOE> {
+        let runner = target.runner.clone();
+
+        let id = target.generate_id();
+
+        let mut canvas = backend::Canvas::create()?;
+
+        let register_redraw_request = Box::new(move || runner.request_redraw(RootWI(id)));
+
+        target.register(&mut canvas, id);
+
+        let window = Window {
+            canvas,
+            previous_pointer: RefCell::new("auto"),
+            position: RefCell::new(LogicalPosition { x: 0.0, y: 0.0 }),
+            id,
+            register_redraw_request,
+        };
+
+        window.set_inner_size(attr.inner_size.unwrap_or(LogicalSize {
+            width: 1024.0,
+            height: 768.0,
+        }));
+        window.set_title(&attr.title);
+        window.set_maximized(attr.maximized);
+        window.set_visible(attr.visible);
+        window.set_window_icon(attr.window_icon);
+
+        Ok(window)
+    }
+
+    pub fn canvas(&self) -> &backend::Canvas {
+        &self.canvas
+    }
+
+    pub fn set_title(&self, title: &str) {
+        self.canvas.set_attribute("alt", title);
+    }
+
+    pub fn set_visible(&self, _visible: bool) {
+        // Intentionally a no-op
+    }
+
+    pub fn request_redraw(&self) {
+        (self.register_redraw_request)();
+    }
+
+    pub fn outer_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+        let (x, y) = self.canvas.position();
+
+        Ok(LogicalPosition { x, y })
+    }
+
+    pub fn inner_position(&self) -> Result<LogicalPosition, NotSupportedError> {
+        Ok(*self.position.borrow())
+    }
+
+    pub fn set_outer_position(&self, position: LogicalPosition) {
+        *self.position.borrow_mut() = position;
+
+        self.canvas.set_attribute("position", "fixed");
+        self.canvas.set_attribute("left", &position.x.to_string());
+        self.canvas.set_attribute("top", &position.y.to_string());
+    }
+
+    #[inline]
+    pub fn inner_size(&self) -> LogicalSize {
+        LogicalSize {
+            width: self.canvas.width() as f64,
+            height: self.canvas.height() as f64,
+        }
+    }
+
+    #[inline]
+    pub fn outer_size(&self) -> LogicalSize {
+        LogicalSize {
+            width: self.canvas.width() as f64,
+            height: self.canvas.height() as f64,
+        }
+    }
+
+    #[inline]
+    pub fn set_inner_size(&self, size: LogicalSize) {
+        self.canvas.set_size(size);
+    }
+
+    #[inline]
+    pub fn set_min_inner_size(&self, _dimensions: Option<LogicalSize>) {
+        // Intentionally a no-op: users can't resize canvas elements
+    }
+
+    #[inline]
+    pub fn set_max_inner_size(&self, _dimensions: Option<LogicalSize>) {
+        // Intentionally a no-op: users can't resize canvas elements
+    }
+
+    #[inline]
+    pub fn set_resizable(&self, _resizable: bool) {
+        // Intentionally a no-op: users can't resize canvas elements
+    }
+
+    #[inline]
+    pub fn hidpi_factor(&self) -> f64 {
+        1.0
+    }
+
+    #[inline]
+    pub fn set_cursor_icon(&self, cursor: CursorIcon) {
+        let text = match cursor {
+            CursorIcon::Default => "auto",
+            CursorIcon::Crosshair => "crosshair",
+            CursorIcon::Hand => "pointer",
+            CursorIcon::Arrow => "default",
+            CursorIcon::Move => "move",
+            CursorIcon::Text => "text",
+            CursorIcon::Wait => "wait",
+            CursorIcon::Help => "help",
+            CursorIcon::Progress => "progress",
+
+            CursorIcon::NotAllowed => "not-allowed",
+            CursorIcon::ContextMenu => "context-menu",
+            CursorIcon::Cell => "cell",
+            CursorIcon::VerticalText => "vertical-text",
+            CursorIcon::Alias => "alias",
+            CursorIcon::Copy => "copy",
+            CursorIcon::NoDrop => "no-drop",
+            CursorIcon::Grab => "grab",
+            CursorIcon::Grabbing => "grabbing",
+            CursorIcon::AllScroll => "all-scroll",
+            CursorIcon::ZoomIn => "zoom-in",
+            CursorIcon::ZoomOut => "zoom-out",
+
+            CursorIcon::EResize => "e-resize",
+            CursorIcon::NResize => "n-resize",
+            CursorIcon::NeResize => "ne-resize",
+            CursorIcon::NwResize => "nw-resize",
+            CursorIcon::SResize => "s-resize",
+            CursorIcon::SeResize => "se-resize",
+            CursorIcon::SwResize => "sw-resize",
+            CursorIcon::WResize => "w-resize",
+            CursorIcon::EwResize => "ew-resize",
+            CursorIcon::NsResize => "ns-resize",
+            CursorIcon::NeswResize => "nesw-resize",
+            CursorIcon::NwseResize => "nwse-resize",
+            CursorIcon::ColResize => "col-resize",
+            CursorIcon::RowResize => "row-resize",
+        };
+        *self.previous_pointer.borrow_mut() = text;
+        self.canvas
+            .set_attribute("style", &format!("cursor: {}", text));
+    }
+
+    #[inline]
+    pub fn set_cursor_position(&self, _position: LogicalPosition) -> Result<(), ExternalError> {
+        // Intentionally a no-op, as the web does not support setting cursor positions
+        Ok(())
+    }
+
+    #[inline]
+    pub fn set_cursor_grab(&self, _grab: bool) -> Result<(), ExternalError> {
+        // Intentionally a no-op, as the web does not (properly) support grabbing the cursor
+        Ok(())
+    }
+
+    #[inline]
+    pub fn set_cursor_visible(&self, visible: bool) {
+        if !visible {
+            self.canvas.set_attribute("cursor", "none");
+        } else {
+            self.canvas
+                .set_attribute("cursor", *self.previous_pointer.borrow());
+        }
+    }
+
+    #[inline]
+    pub fn set_maximized(&self, _maximized: bool) {
+        // Intentionally a no-op, as canvases cannot be 'maximized'
+    }
+
+    #[inline]
+    pub fn fullscreen(&self) -> Option<Fullscreen> {
+        if self.canvas.is_fullscreen() {
+            Some(Fullscreen::Borderless(self.current_monitor()))
+        } else {
+            None
+        }
+    }
+
+    #[inline]
+    pub fn set_fullscreen(&self, monitor: Option<Fullscreen>) {
+        if monitor.is_some() {
+            self.canvas.request_fullscreen();
+        } else if self.canvas.is_fullscreen() {
+            backend::exit_fullscreen();
+        }
+    }
+
+    #[inline]
+    pub fn set_decorations(&self, _decorations: bool) {
+        // Intentionally a no-op, no canvas decorations
+    }
+
+    #[inline]
+    pub fn set_always_on_top(&self, _always_on_top: bool) {
+        // Intentionally a no-op, no window ordering
+    }
+
+    #[inline]
+    pub fn set_window_icon(&self, _window_icon: Option<Icon>) {
+        // Currently an intentional no-op
+    }
+
+    #[inline]
+    pub fn set_ime_position(&self, _position: LogicalPosition) {
+        // Currently a no-op as it does not seem there is good support for this on web
+    }
+
+    #[inline]
+    pub fn current_monitor(&self) -> RootMH {
+        RootMH {
+            inner: monitor::Handle,
+        }
+    }
+
+    #[inline]
+    pub fn available_monitors(&self) -> VecDequeIter<monitor::Handle> {
+        VecDeque::new().into_iter()
+    }
+
+    #[inline]
+    pub fn primary_monitor(&self) -> monitor::Handle {
+        monitor::Handle
+    }
+
+    #[inline]
+    pub fn id(&self) -> Id {
+        return self.id;
+    }
+
+    #[inline]
+    pub fn raw_window_handle(&self) -> raw_window_handle::RawWindowHandle {
+        let handle = WebHandle {
+            id: self.id.0,
+            ..WebHandle::empty()
+        };
+
+        raw_window_handle::RawWindowHandle::Web(handle)
+    }
+}
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Id(pub(crate) u32);
+
+impl Id {
+    pub unsafe fn dummy() -> Id {
+        Id(0)
+    }
+}
+
+#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct PlatformSpecificBuilderAttributes;
--- a/src/platform_impl/windows/dpi.rs
+++ b/src/platform_impl/windows/dpi.rs
@@ -1,6 +1,6 @@
 #![allow(non_snake_case, unused_unsafe)]

-use std::{mem, os::raw::c_void, sync::Once};
+use std::sync::Once;

 use winapi::{
    shared::{
@@ -43,10 +43,7 @@ lazy_static! {
        get_function!("user32.dll", EnableNonClientDpiScaling);
 }

-pub fn become_dpi_aware(enable: bool) {
-    if !enable {
-        return;
-    }
+pub fn become_dpi_aware() {
    static ENABLE_DPI_AWARENESS: Once = Once::new();
    ENABLE_DPI_AWARENESS.call_once(|| {
        unsafe {
--- a/src/platform_impl/windows/event.rs
+++ b/src/platform_impl/windows/event.rs
@@ -39,7 +39,7 @@ unsafe fn get_char(keyboard_state: &[u8; 256], v_key: u32, hkl: HKL) -> Option<c
        hkl,
    );
    if len >= 1 {
-        char::decode_utf16(unicode_bytes.into_iter().cloned())
+        char::decode_utf16(unicode_bytes.iter().cloned())
            .next()
            .and_then(|c| c.ok())
    } else {
--- a/src/platform_impl/windows/event_loop.rs
+++ b/src/platform_impl/windows/event_loop.rs
@@ -46,7 +46,7 @@ use winapi::{

 use crate::{
    dpi::{LogicalPosition, LogicalSize, PhysicalSize},
-    event::{DeviceEvent, Event, KeyboardInput, StartCause, Touch, TouchPhase, WindowEvent},
+    event::{DeviceEvent, Event, Force, KeyboardInput, StartCause, Touch, TouchPhase, WindowEvent},
    event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootELW},
    platform_impl::platform::{
        dpi::{
@@ -54,13 +54,14 @@ use crate::{
        },
        drop_handler::FileDropHandler,
        event::{self, handle_extended_keys, process_key_params, vkey_to_winit_vkey},
+        monitor,
        raw_input::{get_raw_input_data, get_raw_mouse_button_state},
        util,
        window::adjust_size,
        window_state::{CursorFlags, WindowFlags, WindowState},
        wrap_device_id, WindowId, DEVICE_ID,
    },
-    window::WindowId as RootWindowId,
+    window::{Fullscreen, WindowId as RootWindowId},
 };

 type GetPointerFrameInfoHistory = unsafe extern "system" fn(
@@ -77,6 +78,12 @@ type GetPointerDeviceRects = unsafe extern "system" fn(
    displayRect: *mut RECT,
 ) -> BOOL;

+type GetPointerTouchInfo =
+    unsafe extern "system" fn(pointerId: UINT, touchInfo: *mut winuser::POINTER_TOUCH_INFO) -> BOOL;
+
+type GetPointerPenInfo =
+    unsafe extern "system" fn(pointId: UINT, penInfo: *mut winuser::POINTER_PEN_INFO) -> BOOL;
+
 lazy_static! {
    static ref GET_POINTER_FRAME_INFO_HISTORY: Option<GetPointerFrameInfoHistory> =
        get_function!("user32.dll", GetPointerFrameInfoHistory);
@@ -84,6 +91,10 @@ lazy_static! {
        get_function!("user32.dll", SkipPointerFrameMessages);
    static ref GET_POINTER_DEVICE_RECTS: Option<GetPointerDeviceRects> =
        get_function!("user32.dll", GetPointerDeviceRects);
+    static ref GET_POINTER_TOUCH_INFO: Option<GetPointerTouchInfo> =
+        get_function!("user32.dll", GetPointerTouchInfo);
+    static ref GET_POINTER_PEN_INFO: Option<GetPointerPenInfo> =
+        get_function!("user32.dll", GetPointerPenInfo);
 }

 pub(crate) struct SubclassInput<T> {
@@ -121,18 +132,40 @@ pub struct EventLoopWindowTarget<T> {
    pub(crate) runner_shared: EventLoopRunnerShared<T>,
 }

+macro_rules! main_thread_check {
+    ($fn_name:literal) => {{
+        let thread_id = unsafe { processthreadsapi::GetCurrentThreadId() };
+        if thread_id != main_thread_id() {
+            panic!(concat!(
+                "Initializing the event loop outside of the main thread is a significant \
+                 cross-platform compatibility hazard. If you really, absolutely need to create an \
+                 EventLoop on a different thread, please use the `EventLoopExtWindows::",
+                $fn_name,
+                "` function."
+            ));
+        }
+    }};
+}
+
 impl<T: 'static> EventLoop<T> {
    pub fn new() -> EventLoop<T> {
-        Self::with_dpi_awareness(true)
+        main_thread_check!("new_any_thread");
+
+        Self::new_any_thread()
    }

-    pub fn window_target(&self) -> &RootELW<T> {
-        &self.window_target
+    pub fn new_any_thread() -> EventLoop<T> {
+        become_dpi_aware();
+        Self::new_dpi_unaware_any_thread()
    }

-    pub fn with_dpi_awareness(dpi_aware: bool) -> EventLoop<T> {
-        become_dpi_aware(dpi_aware);
+    pub fn new_dpi_unaware() -> EventLoop<T> {
+        main_thread_check!("new_dpi_unaware_any_thread");

+        Self::new_dpi_unaware_any_thread()
+    }
+
+    pub fn new_dpi_unaware_any_thread() -> EventLoop<T> {
        let thread_id = unsafe { processthreadsapi::GetCurrentThreadId() };
        let runner_shared = Rc::new(ELRShared {
            runner: RefCell::new(None),
@@ -155,6 +188,10 @@ impl<T: 'static> EventLoop<T> {
        }
    }

+    pub fn window_target(&self) -> &RootELW<T> {
+        &self.window_target
+    }
+
    pub fn run<F>(mut self, event_handler: F) -> !
    where
        F: 'static + FnMut(Event<T>, &RootELW<T>, &mut ControlFlow),
@@ -167,10 +204,6 @@ impl<T: 'static> EventLoop<T> {
    where
        F: FnMut(Event<T>, &RootELW<T>, &mut ControlFlow),
    {
-        unsafe {
-            winuser::IsGUIThread(1);
-        }
-
        let event_loop_windows_ref = &self.window_target;

        let mut runner = unsafe {
@@ -269,6 +302,21 @@ impl<T> EventLoopWindowTarget<T> {
    }
 }

+fn main_thread_id() -> DWORD {
+    static mut MAIN_THREAD_ID: DWORD = 0;
+    #[used]
+    #[allow(non_upper_case_globals)]
+    #[link_section = ".CRT$XCU"]
+    static INIT_MAIN_THREAD_ID: unsafe fn() = {
+        unsafe fn initer() {
+            MAIN_THREAD_ID = processthreadsapi::GetCurrentThreadId();
+        }
+        initer
+    };
+
+    unsafe { MAIN_THREAD_ID }
+}
+
 pub(crate) type EventLoopRunnerShared<T> = Rc<ELRShared<T>>;
 pub(crate) struct ELRShared<T> {
    runner: RefCell<Option<EventLoopRunner<T>>>,
@@ -694,13 +742,13 @@ impl<T: 'static> Clone for EventLoopProxy<T> {
 }

 impl<T: 'static> EventLoopProxy<T> {
-    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed> {
+    pub fn send_event(&self, event: T) -> Result<(), EventLoopClosed<T>> {
        unsafe {
            if winuser::PostMessageW(self.target_window, *USER_EVENT_MSG_ID, 0, 0) != 0 {
                self.event_send.send(event).ok();
                Ok(())
            } else {
-                Err(EventLoopClosed)
+                Err(EventLoopClosed(event))
            }
        }
    }
@@ -852,6 +900,13 @@ pub(crate) fn subclass_window<T>(window: HWND, subclass_input: SubclassInput<T>)
    assert_eq!(subclass_result, 1);
 }

+fn normalize_pointer_pressure(pressure: u32) -> Option<Force> {
+    match pressure {
+        1..=1024 => Some(Force::Normalized(pressure as f64 / 1024.0)),
+        _ => None,
+    }
+}
+
 /// Any window whose callback is configured to this function will have its events propagated
 /// through the events loop of the thread the window was created in.
 //
@@ -965,6 +1020,51 @@ unsafe extern "system" fn public_window_callback<T>(
            commctrl::DefSubclassProc(window, msg, wparam, lparam)
        }

+        winuser::WM_WINDOWPOSCHANGING => {
+            let mut window_state = subclass_input.window_state.lock();
+            if let Some(ref mut fullscreen) = window_state.fullscreen {
+                let window_pos = &mut *(lparam as *mut winuser::WINDOWPOS);
+                let new_rect = RECT {
+                    left: window_pos.x,
+                    top: window_pos.y,
+                    right: window_pos.x + window_pos.cx,
+                    bottom: window_pos.y + window_pos.cy,
+                };
+                let new_monitor =
+                    winuser::MonitorFromRect(&new_rect, winuser::MONITOR_DEFAULTTONULL);
+                match fullscreen {
+                    Fullscreen::Borderless(ref mut fullscreen_monitor) => {
+                        if new_monitor != fullscreen_monitor.inner.hmonitor()
+                            && new_monitor != ptr::null_mut()
+                        {
+                            if let Ok(new_monitor_info) = monitor::get_monitor_info(new_monitor) {
+                                let new_monitor_rect = new_monitor_info.rcMonitor;
+                                window_pos.x = new_monitor_rect.left;
+                                window_pos.y = new_monitor_rect.top;
+                                window_pos.cx = new_monitor_rect.right - new_monitor_rect.left;
+                                window_pos.cy = new_monitor_rect.bottom - new_monitor_rect.top;
+                            }
+                            *fullscreen_monitor = crate::monitor::MonitorHandle {
+                                inner: monitor::MonitorHandle::new(new_monitor),
+                            };
+                        }
+                    }
+                    Fullscreen::Exclusive(ref video_mode) => {
+                        let old_monitor = video_mode.video_mode.monitor.hmonitor();
+                        if let Ok(old_monitor_info) = monitor::get_monitor_info(old_monitor) {
+                            let old_monitor_rect = old_monitor_info.rcMonitor;
+                            window_pos.x = old_monitor_rect.left;
+                            window_pos.y = old_monitor_rect.top;
+                            window_pos.cx = old_monitor_rect.right - old_monitor_rect.left;
+                            window_pos.cy = old_monitor_rect.bottom - old_monitor_rect.top;
+                        }
+                    }
+                }
+            }
+
+            0
+        }
+
        // WM_MOVE supplies client area positions, so we send Moved here instead.
        winuser::WM_WINDOWPOSCHANGED => {
            use crate::event::WindowEvent::Moved;
@@ -1012,22 +1112,39 @@ unsafe extern "system" fn public_window_callback<T>(
            0
        }

-        winuser::WM_CHAR => {
+        winuser::WM_CHAR | winuser::WM_SYSCHAR => {
            use crate::event::WindowEvent::ReceivedCharacter;
-            let chr: char = mem::transmute(wparam as u32);
-            subclass_input.send_event(Event::WindowEvent {
-                window_id: RootWindowId(WindowId(window)),
-                event: ReceivedCharacter(chr),
-            });
+            use std::char;
+            let is_high_surrogate = 0xD800 <= wparam && wparam <= 0xDBFF;
+            let is_low_surrogate = 0xDC00 <= wparam && wparam <= 0xDFFF;
+
+            if is_high_surrogate {
+                subclass_input.window_state.lock().high_surrogate = Some(wparam as u16);
+            } else if is_low_surrogate {
+                let high_surrogate = subclass_input.window_state.lock().high_surrogate.take();
+
+                if let Some(high_surrogate) = high_surrogate {
+                    let pair = [high_surrogate, wparam as u16];
+                    if let Some(Ok(chr)) = char::decode_utf16(pair.iter().copied()).next() {
+                        subclass_input.send_event(Event::WindowEvent {
+                            window_id: RootWindowId(WindowId(window)),
+                            event: ReceivedCharacter(chr),
+                        });
+                    }
+                }
+            } else {
+                subclass_input.window_state.lock().high_surrogate = None;
+
+                if let Some(chr) = char::from_u32(wparam as u32) {
+                    subclass_input.send_event(Event::WindowEvent {
+                        window_id: RootWindowId(WindowId(window)),
+                        event: ReceivedCharacter(chr),
+                    });
+                }
+            }
            0
        }

-        // Prevents default windows menu hotkeys playing unwanted
-        // "ding" sounds. Alternatively could check for WM_SYSCOMMAND
-        // with wparam being SC_KEYMENU, but this may prevent some
-        // other unwanted default hotkeys as well.
-        winuser::WM_SYSCHAR => 0,
-
        winuser::WM_SYSCOMMAND => {
            if wparam == winuser::SC_SCREENSAVE {
                let window_state = subclass_input.window_state.lock();
@@ -1160,6 +1277,7 @@ unsafe extern "system" fn public_window_callback<T>(
                                virtual_keycode: vkey,
                                modifiers: event::get_key_mods(),
                            },
+                            is_synthetic: false,
                        },
                    });
                    // Windows doesn't emit a delete character by default, but in order to make it
@@ -1188,6 +1306,7 @@ unsafe extern "system" fn public_window_callback<T>(
                            virtual_keycode: vkey,
                            modifiers: event::get_key_mods(),
                        },
+                        is_synthetic: false,
                    },
                });
            }
@@ -1499,7 +1618,7 @@ unsafe extern "system" fn public_window_callback<T>(
                                continue;
                            },
                            location,
-                            force: None, // TODO
+                            force: None, // WM_TOUCH doesn't support pressure information
                            id: input.dwID as u64,
                            device_id: DEVICE_ID,
                        }),
@@ -1551,18 +1670,21 @@ unsafe extern "system" fn public_window_callback<T>(
                // The information retrieved appears in reverse chronological order, with the most recent entry in the first
                // row of the returned array
                for pointer_info in pointer_infos.iter().rev() {
-                    let mut device_rect: RECT = mem::uninitialized();
-                    let mut display_rect: RECT = mem::uninitialized();
+                    let mut device_rect = mem::MaybeUninit::uninit();
+                    let mut display_rect = mem::MaybeUninit::uninit();

                    if (GetPointerDeviceRects(
                        pointer_info.sourceDevice,
-                        &mut device_rect as *mut _,
-                        &mut display_rect as *mut _,
+                        device_rect.as_mut_ptr(),
+                        display_rect.as_mut_ptr(),
                    )) == 0
                    {
                        continue;
                    }

+                    let device_rect = device_rect.assume_init();
+                    let display_rect = display_rect.assume_init();
+
                    // For the most precise himetric to pixel conversion we calculate the ratio between the resolution
                    // of the display device (pixel) and the touch device (himetric).
                    let himetric_to_pixel_ratio_x = (display_rect.right - display_rect.left) as f64
@@ -1587,6 +1709,38 @@ unsafe extern "system" fn public_window_callback<T>(
                        continue;
                    }

+                    let force = match pointer_info.pointerType {
+                        winuser::PT_TOUCH => {
+                            let mut touch_info = mem::MaybeUninit::uninit();
+                            GET_POINTER_TOUCH_INFO.and_then(|GetPointerTouchInfo| {
+                                match GetPointerTouchInfo(
+                                    pointer_info.pointerId,
+                                    touch_info.as_mut_ptr(),
+                                ) {
+                                    0 => None,
+                                    _ => normalize_pointer_pressure(
+                                        touch_info.assume_init().pressure,
+                                    ),
+                                }
+                            })
+                        }
+                        winuser::PT_PEN => {
+                            let mut pen_info = mem::MaybeUninit::uninit();
+                            GET_POINTER_PEN_INFO.and_then(|GetPointerPenInfo| {
+                                match GetPointerPenInfo(
+                                    pointer_info.pointerId,
+                                    pen_info.as_mut_ptr(),
+                                ) {
+                                    0 => None,
+                                    _ => {
+                                        normalize_pointer_pressure(pen_info.assume_init().pressure)
+                                    }
+                                }
+                            })
+                        }
+                        _ => None,
+                    };
+
                    let x = location.x as f64 + x.fract();
                    let y = location.y as f64 + y.fract();
                    let location = LogicalPosition::from_physical((x, y), dpi_factor);
@@ -1604,7 +1758,7 @@ unsafe extern "system" fn public_window_callback<T>(
                                continue;
                            },
                            location,
-                            force: None, // TODO
+                            force,
                            id: pointer_info.pointerId as u64,
                            device_id: DEVICE_ID,
                        }),
--- a/src/platform_impl/windows/monitor.rs
+++ b/src/platform_impl/windows/monitor.rs
@@ -21,17 +21,46 @@ use crate::{
    },
 };

-#[derive(Derivative)]
-#[derivative(Debug, Clone, Eq, PartialEq, Hash)]
+#[derive(Clone)]
 pub struct VideoMode {
    pub(crate) size: (u32, u32),
    pub(crate) bit_depth: u16,
    pub(crate) refresh_rate: u16,
    pub(crate) monitor: MonitorHandle,
-    #[derivative(Debug = "ignore", PartialEq = "ignore", Hash = "ignore")]
    pub(crate) native_video_mode: wingdi::DEVMODEW,
 }

+impl PartialEq for VideoMode {
+    fn eq(&self, other: &Self) -> bool {
+        self.size == other.size
+            && self.bit_depth == other.bit_depth
+            && self.refresh_rate == other.refresh_rate
+            && self.monitor == other.monitor
+    }
+}
+
+impl Eq for VideoMode {}
+
+impl std::hash::Hash for VideoMode {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.size.hash(state);
+        self.bit_depth.hash(state);
+        self.refresh_rate.hash(state);
+        self.monitor.hash(state);
+    }
+}
+
+impl std::fmt::Debug for VideoMode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("VideoMode")
+            .field("size", &self.size)
+            .field("bit_depth", &self.bit_depth)
+            .field("refresh_rate", &self.refresh_rate)
+            .field("monitor", &self.monitor)
+            .finish()
+    }
+}
+
 impl VideoMode {
    pub fn size(&self) -> PhysicalSize {
        self.size.into()
--- a/src/platform_impl/windows/util.rs
+++ b/src/platform_impl/windows/util.rs
@@ -141,6 +141,16 @@ pub fn set_cursor_hidden(hidden: bool) {
    }
 }

+pub fn get_cursor_clip() -> Result<RECT, io::Error> {
+    unsafe {
+        let mut rect: RECT = mem::zeroed();
+        win_to_err(|| winuser::GetClipCursor(&mut rect)).map(|_| rect)
+    }
+}
+
+/// Sets the cursor's clip rect.
+///
+/// Note that calling this will automatically dispatch a `WM_MOUSEMOVE` event.
 pub fn set_cursor_clip(rect: Option<RECT>) -> Result<(), io::Error> {
    unsafe {
        let rect_ptr = rect
@@ -151,6 +161,19 @@ pub fn set_cursor_clip(rect: Option<RECT>) -> Result<(), io::Error> {
    }
 }

+pub fn get_desktop_rect() -> RECT {
+    unsafe {
+        let left = winuser::GetSystemMetrics(winuser::SM_XVIRTUALSCREEN);
+        let top = winuser::GetSystemMetrics(winuser::SM_YVIRTUALSCREEN);
+        RECT {
+            left,
+            top,
+            right: left + winuser::GetSystemMetrics(winuser::SM_CXVIRTUALSCREEN),
+            bottom: top + winuser::GetSystemMetrics(winuser::SM_CYVIRTUALSCREEN),
+        }
+    }
+}
+
 pub fn is_focused(window: HWND) -> bool {
    window == unsafe { winuser::GetActiveWindow() }
 }
--- a/src/platform_impl/windows/window.rs
+++ b/src/platform_impl/windows/window.rs
@@ -14,7 +14,7 @@ use std::{
 use winapi::{
    ctypes::c_int,
    shared::{
-        minwindef::{DWORD, LPARAM, UINT, WORD, WPARAM},
+        minwindef::{DWORD, HINSTANCE, LPARAM, UINT, WORD, WPARAM},
        windef::{HWND, POINT, RECT},
    },
    um::{
@@ -202,7 +202,10 @@ impl Window {
                y as c_int,
                0,
                0,
-                winuser::SWP_ASYNCWINDOWPOS | winuser::SWP_NOZORDER | winuser::SWP_NOSIZE,
+                winuser::SWP_ASYNCWINDOWPOS
+                    | winuser::SWP_NOZORDER
+                    | winuser::SWP_NOSIZE
+                    | winuser::SWP_NOACTIVATE,
            );
            winuser::UpdateWindow(self.window.0);
        }
@@ -212,6 +215,15 @@ impl Window {
    pub fn set_outer_position(&self, logical_position: LogicalPosition) {
        let dpi_factor = self.hidpi_factor();
        let (x, y) = logical_position.to_physical(dpi_factor).into();
+
+        let window_state = Arc::clone(&self.window_state);
+        let window = self.window.clone();
+        self.thread_executor.execute_in_thread(move || {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
+                f.set(WindowFlags::MAXIMIZED, false)
+            });
+        });
+
        self.set_position_physical(x, y);
    }

@@ -287,6 +299,15 @@ impl Window {
    pub fn set_inner_size(&self, logical_size: LogicalSize) {
        let dpi_factor = self.hidpi_factor();
        let (width, height) = logical_size.to_physical(dpi_factor).into();
+
+        let window_state = Arc::clone(&self.window_state);
+        let window = self.window.clone();
+        self.thread_executor.execute_in_thread(move || {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
+                f.set(WindowFlags::MAXIMIZED, false)
+            });
+        });
+
        self.set_inner_size_physical(width, height);
    }

@@ -340,10 +361,16 @@ impl Window {
        self.window.0
    }

+    #[inline]
+    pub fn hinstance(&self) -> HINSTANCE {
+        unsafe { winuser::GetWindowLongW(self.hwnd(), winuser::GWL_HINSTANCE) as *mut _ }
+    }
+
    #[inline]
    pub fn raw_window_handle(&self) -> RawWindowHandle {
        let handle = WindowsHandle {
            hwnd: self.window.0 as *mut _,
+            hinstance: self.hinstance() as *mut _,
            ..WindowsHandle::empty()
        };
        RawWindowHandle::Windows(handle)
@@ -581,6 +608,7 @@ impl Window {
                    {
                        window_state_lock.dpi_factor = dpi_factor;
                        drop(window_state_lock);
+                        let client_rect = util::adjust_window_rect(window.0, client_rect).unwrap();

                        unsafe {
                            winuser::SetWindowPos(
@@ -590,7 +618,9 @@ impl Window {
                                client_rect.top,
                                client_rect.right - client_rect.left,
                                client_rect.bottom - client_rect.top,
-                                winuser::SWP_ASYNCWINDOWPOS | winuser::SWP_NOZORDER,
+                                winuser::SWP_ASYNCWINDOWPOS
+                                    | winuser::SWP_NOZORDER
+                                    | winuser::SWP_NOACTIVATE,
                            );
                            winuser::UpdateWindow(window.0);
                        }
--- a/src/platform_impl/windows/window_state.rs
+++ b/src/platform_impl/windows/window_state.rs
@@ -32,6 +32,7 @@ pub struct WindowState {
    /// Used to supress duplicate redraw attempts when calling `request_redraw` multiple
    /// times in `EventsCleared`.
    pub queued_out_of_band_redraw: bool,
+    pub high_surrogate: Option<u16>,
    window_flags: WindowFlags,
 }

@@ -114,6 +115,7 @@ impl WindowState {

            fullscreen: None,
            queued_out_of_band_redraw: false,
+            high_surrogate: None,
            window_flags: WindowFlags::empty(),
        }
    }
@@ -253,7 +255,10 @@ impl WindowFlags {
                    0,
                    0,
                    0,
-                    winuser::SWP_ASYNCWINDOWPOS | winuser::SWP_NOMOVE | winuser::SWP_NOSIZE,
+                    winuser::SWP_ASYNCWINDOWPOS
+                        | winuser::SWP_NOMOVE
+                        | winuser::SWP_NOSIZE
+                        | winuser::SWP_NOACTIVATE,
                );
                winuser::UpdateWindow(window);
            }
@@ -305,10 +310,25 @@ impl CursorFlags {
        let client_rect = util::get_client_rect(window)?;

        if util::is_focused(window) {
-            if self.contains(CursorFlags::GRABBED) {
-                util::set_cursor_clip(Some(client_rect))?;
-            } else {
-                util::set_cursor_clip(None)?;
+            let cursor_clip = match self.contains(CursorFlags::GRABBED) {
+                true => Some(client_rect),
+                false => None,
+            };
+
+            let rect_to_tuple = |rect: RECT| (rect.left, rect.top, rect.right, rect.bottom);
+            let active_cursor_clip = rect_to_tuple(util::get_cursor_clip()?);
+            let desktop_rect = rect_to_tuple(util::get_desktop_rect());
+
+            let active_cursor_clip = match desktop_rect == active_cursor_clip {
+                true => None,
+                false => Some(active_cursor_clip),
+            };
+
+            // We do this check because calling `set_cursor_clip` incessantly will flood the event
+            // loop with `WM_MOUSEMOVE` events, and `refresh_os_cursor` is called by `set_cursor_flags`
+            // which at times gets called once every iteration of the eventloop.
+            if active_cursor_clip != cursor_clip.map(rect_to_tuple) {
+                util::set_cursor_clip(cursor_clip)?;
            }
        }

--- a/src/window.rs
+++ b/src/window.rs
@@ -5,7 +5,7 @@ use crate::{
    dpi::{LogicalPosition, LogicalSize},
    error::{ExternalError, NotSupportedError, OsError},
    event_loop::EventLoopWindowTarget,
-    monitor::{AvailableMonitorsIter, MonitorHandle, VideoMode},
+    monitor::{MonitorHandle, VideoMode},
    platform_impl,
 };

@@ -180,10 +180,11 @@ impl Default for WindowAttributes {
        }
    }
 }
+
 impl WindowBuilder {
    /// Initializes a new `WindowBuilder` with default values.
    #[inline]
-    pub fn new() -> WindowBuilder {
+    pub fn new() -> Self {
        WindowBuilder {
            window: Default::default(),
            platform_specific: Default::default(),
@@ -191,110 +192,129 @@ impl WindowBuilder {
    }

    /// Requests the window to be of specific dimensions.
+    ///
+    /// See [`Window::set_inner_size`] for details.
+    ///
+    /// [`Window::set_inner_size`]: crate::window::Window::set_inner_size
    #[inline]
-    pub fn with_inner_size(mut self, size: LogicalSize) -> WindowBuilder {
+    pub fn with_inner_size(mut self, size: LogicalSize) -> Self {
        self.window.inner_size = Some(size);
        self
    }

-    /// Sets a minimum dimension size for the window
+    /// Sets a minimum dimension size for the window.
+    ///
+    /// See [`Window::set_min_inner_size`] for details.
+    ///
+    /// [`Window::set_min_inner_size`]: crate::window::Window::set_min_inner_size
    #[inline]
-    pub fn with_min_inner_size(mut self, min_size: LogicalSize) -> WindowBuilder {
+    pub fn with_min_inner_size(mut self, min_size: LogicalSize) -> Self {
        self.window.min_inner_size = Some(min_size);
        self
    }

-    /// Sets a maximum dimension size for the window
+    /// Sets a maximum dimension size for the window.
+    ///
+    /// See [`Window::set_max_inner_size`] for details.
+    ///
+    /// [`Window::set_max_inner_size`]: crate::window::Window::set_max_inner_size
    #[inline]
-    pub fn with_max_inner_size(mut self, max_size: LogicalSize) -> WindowBuilder {
+    pub fn with_max_inner_size(mut self, max_size: LogicalSize) -> Self {
        self.window.max_inner_size = Some(max_size);
        self
    }

-    /// Sets whether the window is resizable or not
+    /// Sets whether the window is resizable or not.
    ///
-    /// Note that making the window unresizable doesn't exempt you from handling `Resized`, as that event can still be
-    /// triggered by DPI scaling, entering fullscreen mode, etc.
+    /// See [`Window::set_resizable`] for details.
    ///
-    /// ## Platform-specific
-    ///
-    /// This only has an effect on desktop platforms.
-    ///
-    /// Due to a bug in XFCE, this has no effect on Xfwm.
+    /// [`Window::set_resizable`]: crate::window::Window::set_resizable
    #[inline]
-    pub fn with_resizable(mut self, resizable: bool) -> WindowBuilder {
+    pub fn with_resizable(mut self, resizable: bool) -> Self {
        self.window.resizable = resizable;
        self
    }

    /// Requests a specific title for the window.
+    ///
+    /// See [`Window::set_title`] for details.
+    ///
+    /// [`Window::set_title`]: crate::window::Window::set_title
    #[inline]
-    pub fn with_title<T: Into<String>>(mut self, title: T) -> WindowBuilder {
+    pub fn with_title<T: Into<String>>(mut self, title: T) -> Self {
        self.window.title = title.into();
        self
    }

-    /// Sets the window fullscreen state. None means a normal window, Some(Fullscreen)
-    /// means a fullscreen window on that specific monitor
+    /// Sets the window fullscreen state.
    ///
-    /// ## Platform-specific
+    /// See [`Window::set_fullscreen`] for details.
    ///
-    /// - **Windows:** Screen saver is disabled in fullscreen mode.
+    /// [`Window::set_fullscreen`]: crate::window::Window::set_fullscreen
    #[inline]
-    pub fn with_fullscreen(mut self, monitor: Option<Fullscreen>) -> WindowBuilder {
+    pub fn with_fullscreen(mut self, monitor: Option<Fullscreen>) -> Self {
        self.window.fullscreen = monitor;
        self
    }

    /// Requests maximized mode.
+    ///
+    /// See [`Window::set_maximized`] for details.
+    ///
+    /// [`Window::set_maximized`]: crate::window::Window::set_maximized
    #[inline]
-    pub fn with_maximized(mut self, maximized: bool) -> WindowBuilder {
+    pub fn with_maximized(mut self, maximized: bool) -> Self {
        self.window.maximized = maximized;
        self
    }

    /// Sets whether the window will be initially hidden or visible.
+    ///
+    /// See [`Window::set_visible`] for details.
+    ///
+    /// [`Window::set_visible`]: crate::window::Window::set_visible
    #[inline]
-    pub fn with_visible(mut self, visible: bool) -> WindowBuilder {
+    pub fn with_visible(mut self, visible: bool) -> Self {
        self.window.visible = visible;
        self
    }

    /// Sets whether the background of the window should be transparent.
    #[inline]
-    pub fn with_transparent(mut self, transparent: bool) -> WindowBuilder {
+    pub fn with_transparent(mut self, transparent: bool) -> Self {
        self.window.transparent = transparent;
        self
    }

    /// Sets whether the window should have a border, a title bar, etc.
+    ///
+    /// See [`Window::set_decorations`] for details.
+    ///
+    /// [`Window::set_decorations`]: crate::window::Window::set_decorations
    #[inline]
-    pub fn with_decorations(mut self, decorations: bool) -> WindowBuilder {
+    pub fn with_decorations(mut self, decorations: bool) -> Self {
        self.window.decorations = decorations;
        self
    }

    /// Sets whether or not the window will always be on top of other windows.
+    ///
+    /// See [`Window::set_always_on_top`] for details.
+    ///
+    /// [`Window::set_always_on_top`]: crate::window::Window::set_always_on_top
    #[inline]
-    pub fn with_always_on_top(mut self, always_on_top: bool) -> WindowBuilder {
+    pub fn with_always_on_top(mut self, always_on_top: bool) -> Self {
        self.window.always_on_top = always_on_top;
        self
    }

-    /// Sets the window icon. On Windows and X11, this is typically the small icon in the top-left
-    /// corner of the titlebar.
+    /// Sets the window icon.
    ///
-    /// ## Platform-specific
+    /// See [`Window::set_window_icon`] for details.
    ///
-    /// This only has an effect on Windows and X11.
-    ///
-    /// On Windows, this sets `ICON_SMALL`. The base size for a window icon is 16x16, but it's
-    /// recommended to account for screen scaling and pick a multiple of that, i.e. 32x32.
-    ///
-    /// X11 has no universal guidelines for icon sizes, so you're at the whims of the WM. That
-    /// said, it's usually in the same ballpark as on Windows.
+    /// [`Window::set_window_icon`]: crate::window::Window::set_window_icon
    #[inline]
-    pub fn with_window_icon(mut self, window_icon: Option<Icon>) -> WindowBuilder {
+    pub fn with_window_icon(mut self, window_icon: Option<Icon>) -> Self {
        self.window.window_icon = window_icon;
        self
    }
@@ -302,13 +322,21 @@ impl WindowBuilder {
    /// Builds the window.
    ///
    /// Possible causes of error include denied permission, incompatible system, and lack of memory.
+    ///
+    /// Platform-specific behavior:
+    /// - **Web**: The window is created but not inserted into the web page automatically. Please
+    /// see the web platform module for more information.
    #[inline]
    pub fn build<T: 'static>(
        self,
        window_target: &EventLoopWindowTarget<T>,
    ) -> Result<Window, OsError> {
-        platform_impl::Window::new(&window_target.p, self.window, self.platform_specific)
-            .map(|window| Window { window })
+        platform_impl::Window::new(&window_target.p, self.window, self.platform_specific).map(
+            |window| {
+                window.request_redraw();
+                Window { window }
+            },
+        )
    }
 }

@@ -316,10 +344,16 @@ impl WindowBuilder {
 impl Window {
    /// Creates a new Window for platforms where this is appropriate.
    ///
-    /// This function is equivalent to `WindowBuilder::new().build(event_loop)`.
+    /// This function is equivalent to [`WindowBuilder::new().build(event_loop)`].
    ///
    /// Error should be very rare and only occur in case of permission denied, incompatible system,
    ///  out of memory, etc.
+    ///
+    /// Platform-specific behavior:
+    /// - **Web**: The window is created but not inserted into the web page automatically. Please
+    /// see the web platform module for more information.
+    ///
+    /// [`WindowBuilder::new().build(event_loop)`]: crate::window::WindowBuilder::build
    #[inline]
    pub fn new<T: 'static>(event_loop: &EventLoopWindowTarget<T>) -> Result<Window, OsError> {
        let builder = WindowBuilder::new();
@@ -334,7 +368,7 @@ impl Window {

    /// Returns the DPI factor that can be used to map logical pixels to physical pixels, and vice versa.
    ///
-    /// See the [`dpi`](../dpi/index.html) module for more information.
+    /// See the [`dpi`](crate::dpi) module for more information.
    ///
    /// Note that this value can change depending on user action (for example if the window is
    /// moved to another screen); as such, tracking `WindowEvent::HiDpiFactorChanged` events is
@@ -413,9 +447,8 @@ impl Window {

    /// Modifies the position of the window.
    ///
-    /// See `outer_position` for more information about the coordinates.
-    ///
-    /// This is a no-op if the window has already been closed.
+    /// See `outer_position` for more information about the coordinates. This automatically un-maximizes the
+    /// window if it's maximized.
    ///
    /// ## Platform-specific
    ///
@@ -445,7 +478,8 @@ impl Window {

    /// Modifies the inner size of the window.
    ///
-    /// See `inner_size` for more information about the values.
+    /// See `inner_size` for more information about the values. This automatically un-maximizes the
+    /// window if it's maximized.
    ///
    /// ## Platform-specific
    ///
@@ -475,6 +509,7 @@ impl Window {
    /// ## Platform-specific
    ///
    /// - **iOS:** Has no effect.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_min_inner_size(&self, dimensions: Option<LogicalSize>) {
        self.window.set_min_inner_size(dimensions)
@@ -485,6 +520,7 @@ impl Window {
    /// ## Platform-specific
    ///
    /// - **iOS:** Has no effect.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_max_inner_size(&self, dimensions: Option<LogicalSize>) {
        self.window.set_max_inner_size(dimensions)
@@ -510,6 +546,7 @@ impl Window {
    ///
    /// - **Android:** Has no effect.
    /// - **iOS:** Can only be called on the main thread.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_visible(&self, visible: bool) {
        self.window.set_visible(visible)
@@ -529,6 +566,7 @@ impl Window {
    /// ## Platform-specific
    ///
    /// - **iOS:** Has no effect.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_resizable(&self, resizable: bool) {
        self.window.set_resizable(resizable)
@@ -539,6 +577,7 @@ impl Window {
    /// ## Platform-specific
    ///
    /// - **iOS:** Has no effect.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_maximized(&self, maximized: bool) {
        self.window.set_maximized(maximized)
@@ -556,16 +595,13 @@ impl Window {
    ///
    ///   `Fullscreen::Borderless` provides a borderless fullscreen window on a
    ///   separate space. This is the idiomatic way for fullscreen games to work
-    ///   on macOS. See [`WindowExtMacOs::set_simple_fullscreen`][simple] if
+    ///   on macOS. See `WindowExtMacOs::set_simple_fullscreen` if
    ///   separate spaces are not preferred.
    ///
    ///   The dock and the menu bar are always disabled in fullscreen mode.
    /// - **iOS:** Can only be called on the main thread.
    /// - **Wayland:** Does not support exclusive fullscreen mode.
    /// - **Windows:** Screen saver is disabled in fullscreen mode.
-    ///
-    /// [simple]:
-    /// ../platform/macos/trait.WindowExtMacOS.html#tymethod.set_simple_fullscreen
    #[inline]
    pub fn set_fullscreen(&self, fullscreen: Option<Fullscreen>) {
        self.window.set_fullscreen(fullscreen)
@@ -584,8 +620,11 @@ impl Window {
    /// Turn window decorations on or off.
    ///
    /// ## Platform-specific
+    /// - **iOS:** Can only be called on the main thread. Controls whether the status bar is hidden
+    ///   via [`setPrefersStatusBarHidden`].
+    /// - **Web:** Has no effect.
    ///
-    /// - **iOS:** Has no effect.
+    /// [`setPrefersStatusBarHidden`]: https://developer.apple.com/documentation/uikit/uiviewcontroller/1621440-prefersstatusbarhidden?language=objc
    #[inline]
    pub fn set_decorations(&self, decorations: bool) {
        self.window.set_decorations(decorations)
@@ -596,6 +635,7 @@ impl Window {
    /// ## Platform-specific
    ///
    /// - **iOS:** Has no effect.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_always_on_top(&self, always_on_top: bool) {
        self.window.set_always_on_top(always_on_top)
@@ -604,11 +644,15 @@ impl Window {
    /// Sets the window icon. On Windows and X11, this is typically the small icon in the top-left
    /// corner of the titlebar.
    ///
-    /// For more usage notes, see `WindowBuilder::with_window_icon`.
-    ///
    /// ## Platform-specific
    ///
    /// This only has an effect on Windows and X11.
+    ///
+    /// On Windows, this sets `ICON_SMALL`. The base size for a window icon is 16x16, but it's
+    /// recommended to account for screen scaling and pick a multiple of that, i.e. 32x32.
+    ///
+    /// X11 has no universal guidelines for icon sizes, so you're at the whims of the WM. That
+    /// said, it's usually in the same ballpark as on Windows.
    #[inline]
    pub fn set_window_icon(&self, window_icon: Option<Icon>) {
        self.window.set_window_icon(window_icon)
@@ -619,6 +663,7 @@ impl Window {
    /// ## Platform-specific
    ///
    /// **iOS:** Has no effect.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_ime_position(&self, position: LogicalPosition) {
        self.window.set_ime_position(position)
@@ -643,6 +688,7 @@ impl Window {
    /// ## Platform-specific
    ///
    /// - **iOS:** Always returns an `Err`.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_cursor_position(&self, position: LogicalPosition) -> Result<(), ExternalError> {
        self.window.set_cursor_position(position)
@@ -654,8 +700,11 @@ impl Window {
    ///
    /// - **macOS:** This presently merely locks the cursor in a fixed location, which looks visually
    ///   awkward.
+    /// - **Wayland:** This presently merely locks the cursor in a fixed location, which looks visually
+    ///   awkward.
    /// - **Android:** Has no effect.
    /// - **iOS:** Always returns an Err.
+    /// - **Web:** Has no effect.
    #[inline]
    pub fn set_cursor_grab(&self, grab: bool) -> Result<(), ExternalError> {
        self.window.set_cursor_grab(grab)
@@ -669,6 +718,7 @@ impl Window {
    ///
    /// - **Windows:** The cursor is only hidden within the confines of the window.
    /// - **X11:** The cursor is only hidden within the confines of the window.
+    /// - **Wayland:** The cursor is only hidden within the confines of the window.
    /// - **macOS:** The cursor is hidden as long as the window has input focus, even if the cursor is
    ///   outside of the window.
    /// - **iOS:** Has no effect.
@@ -699,11 +749,11 @@ impl Window {
    ///
    /// **iOS:** Can only be called on the main thread.
    #[inline]
-    pub fn available_monitors(&self) -> AvailableMonitorsIter {
-        let data = self.window.available_monitors();
-        AvailableMonitorsIter {
-            data: data.into_iter(),
-        }
+    pub fn available_monitors(&self) -> impl Iterator<Item = MonitorHandle> {
+        self.window
+            .available_monitors()
+            .into_iter()
+            .map(|inner| MonitorHandle { inner })
    }

    /// Returns the primary monitor of the system.
@@ -760,7 +810,9 @@ pub enum CursorIcon {
    Alias,
    Copy,
    NoDrop,
+    /// Indicates something can be grabbed.
    Grab,
+    /// Indicates something is grabbed.
    Grabbing,
    AllScroll,
    ZoomIn,
--- a/tests/send_objects.rs
+++ b/tests/send_objects.rs
@@ -1,6 +1,7 @@
 #[allow(dead_code)]
 fn needs_send<T: Send>() {}

+#[cfg(not(target_arch = "wasm32"))]
 #[test]
 fn event_loop_proxy_send() {
    #[allow(dead_code)]
@@ -10,6 +11,7 @@ fn event_loop_proxy_send() {
    }
 }

+#[cfg(not(target_arch = "wasm32"))]
 #[test]
 fn window_send() {
    // ensures that `winit::Window` implements `Send`
--- a/tests/sync_object.rs
+++ b/tests/sync_object.rs
@@ -1,6 +1,7 @@
 #[allow(dead_code)]
 fn needs_sync<T: Sync>() {}

+#[cfg(not(target_arch = "wasm32"))]
 #[test]
 fn window_sync() {
    // ensures that `winit::Window` implements `Sync`