diff --git a/CHANGELOG.md b/CHANGELOG.md
index 824a5e7c9..26b5fee45 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,14 @@ Unreleased` header.
 - On Wayland, fix `Window::set_{min,max}_inner_size` not always applied.
 - On Windows, fix inconsistent resizing behavior with multi-monitor setups when repositioning outside the event loop.
 - On Wayland, fix `WAYLAND_SOCKET` not used when detecting platform.
+- **Breaking:** Move some types to the `winit-core` crate. Most types are
+  re-exported verbatim; however:
+  - `Event`, `WindowEvent` and `KeyEvent` now take a generic that `winit`
+    implements.
+  - `ActivationToken` and `InnerSizeWriter` expose new methods to make them
+    useful.
+  - `InnerSizeWriter::request_inner_size` returns an `InnerSizeIgnored` error
+    instead of an `ExternalError`.
 
 # 0.29.10
 
diff --git a/Cargo.toml b/Cargo.toml
index da7f2b1ee..122c8e244 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,9 @@ resolver = "2"
 
 [workspace.dependencies]
 bitflags = "2"
+cfg_aliases = "0.2.0"
 cursor-icon = "1.1.0"
 serde = { version = "1", features = ["serde_derive"] }
 smol_str = "0.2.0"
+web-time = "1"
 winit-core = { path = "./winit-core", default-features = false, features = ["std"] }
diff --git a/winit-core/Cargo.toml b/winit-core/Cargo.toml
index da345d173..ec6f2864b 100644
--- a/winit-core/Cargo.toml
+++ b/winit-core/Cargo.toml
@@ -21,9 +21,12 @@ serde = ["dep:serde", "cursor-icon/serde", "smol_str/serde"]
 [dependencies]
 bitflags.workspace = true
 cursor-icon.workspace = true
+mint = { version = "0.5.6", optional = true }
 serde = { workspace = true, optional = true }
 smol_str.workspace = true
-web-time = "1"
+
+[target.'cfg(target_family = "wasm")'.dependencies]
+web-time.workspace = true
 
 [build-dependencies]
-cfg_aliases = "0.2.0"
+cfg_aliases.workspace = true
diff --git a/winit-core/src/event.rs b/winit-core/src/event.rs
index ba6444002..94f6d6ec8 100644
--- a/winit-core/src/event.rs
+++ b/winit-core/src/event.rs
@@ -14,6 +14,9 @@ use std::time::Instant;
 #[cfg(web_platform)]
 use web_time::Instant;
 
+#[cfg(feature = "serde")]
+pub use serde::{Serialize, Deserialize};
+
 use smol_str::SmolStr;
 
 /// Identifier of an input device.
@@ -778,6 +781,7 @@ pub struct Modifiers {
 }
 
 impl Modifiers {
+    /// Only `winit` should instantiate this!
     #[doc(hidden)]
     pub fn new(state: ModifiersState, pressed_mods: ModifiersKeys) -> Self {
         Self {
@@ -1120,6 +1124,7 @@ impl InnerSizeWriter {
         }
     }
 
+    /// Get the underlying size.
     pub fn get(&self) -> PhysicalSize<u32> {
         *self.new_inner_size.upgrade().unwrap().lock().unwrap()
     }
diff --git a/winit-core/src/window.rs b/winit-core/src/window.rs
index 5f5e7627d..f2daf0715 100644
--- a/winit-core/src/window.rs
+++ b/winit-core/src/window.rs
@@ -3,6 +3,9 @@
 #[doc(inline)]
 pub use cursor_icon::{CursorIcon, ParseError as CursorIconParseError};
 
+#[cfg(feature = "serde")]
+pub use serde::{Serialize, Deserialize};
+
 /// Identifier of a window. Unique for each window.
 ///
 /// Can be obtained with [`window.id()`](`Window::id`).
@@ -192,7 +195,7 @@ impl Default for ImePurpose {
     }
 }
 
-/// An opaque token used to activate the [`Window`].
+/// An stringly-typed token used to activate the [`Window`].
 ///
 /// [`Window`]: crate::window::Window
 #[derive(Debug, PartialEq, Eq, Clone)]
@@ -201,14 +204,17 @@ pub struct ActivationToken {
 }
 
 impl ActivationToken {
-    pub fn new(_token: String) -> Self {
-        Self { token: _token }
+    /// Create a new [`ActivationToken`].
+    pub fn new(token: String) -> Self {
+        Self { token }
     }
 
+    /// Get the underlying token.
     pub fn token(&self) -> &str {
         &self.token
     }
 
+    /// Convert into the underlying token.
     pub fn into_token(self) -> String {
         self.token
     }
diff --git a/winit/Cargo.toml b/winit/Cargo.toml
index 8db59ef37..2ce501e4b 100644
--- a/winit/Cargo.toml
+++ b/winit/Cargo.toml
@@ -52,19 +52,19 @@ wayland-csd-adwaita-crossfont = ["sctk-adwaita", "sctk-adwaita/crossfont"]
 wayland-csd-adwaita-notitle = ["sctk-adwaita"]
 android-native-activity = ["android-activity/native-activity"]
 android-game-activity = ["android-activity/game-activity"]
-serde = ["dep:serde", "cursor-icon/serde", "smol_str/serde"]
+mint = ["winit-core/mint"]
+serde = ["dep:serde", "winit-core/serde", "cursor-icon/serde", "smol_str/serde"]
 rwh_04 = ["dep:rwh_04", "ndk/rwh_04"]
 rwh_05 = ["dep:rwh_05", "ndk/rwh_05"]
 rwh_06 = ["dep:rwh_06", "ndk/rwh_06"]
 
 [build-dependencies]
-cfg_aliases = "0.2.0"
+cfg_aliases.workspace = true
 
 [dependencies]
 bitflags.workspace = true
 cursor-icon.workspace = true
 log = "0.4"
-mint = { version = "0.5.6", optional = true }
 once_cell = "1.12"
 rwh_04 = { package = "raw-window-handle", version = "0.4", optional = true }
 rwh_05 = { package = "raw-window-handle", version = "0.5.2", features = ["std"], optional = true }
@@ -246,7 +246,7 @@ js-sys = "0.3.64"
 pin-project = "1"
 wasm-bindgen = "0.2"
 wasm-bindgen-futures = "0.4"
-web-time = "1"
+web-time.workspace = true
 
 [target.'cfg(all(target_family = "wasm", target_feature = "atomics"))'.dependencies]
 atomic-waker = "1"
diff --git a/winit/src/error.rs b/winit/src/error.rs
index af2b0e616..6a2b8367f 100644
--- a/winit/src/error.rs
+++ b/winit/src/error.rs
@@ -16,6 +16,12 @@ pub enum ExternalError {
     Os(OsError),
 }
 
+impl From<winit_core::event::InnerSizeIgnored> for ExternalError {
+    fn from(_: winit_core::event::InnerSizeIgnored) -> Self {
+        Self::Ignored
+    }
+}
+
 /// The error type for when the OS cannot perform the requested operation.
 #[derive(Debug)]
 pub struct OsError {
diff --git a/winit/src/window.rs b/winit/src/window.rs
index 7a8d7b763..6a4562894 100644
--- a/winit/src/window.rs
+++ b/winit/src/window.rs
@@ -14,9 +14,6 @@ pub use crate::icon::{BadIcon, Icon};
 #[doc(inline)]
 pub use winit_core::window::*;
 
-#[cfg(feature = "serde")]
-use serde::{Deserialize, Serialize};
-
 /// Represents a window.
 ///
 /// The window is closed when dropped.