Draft web platform structure

src/platform_impl/web/web_sys/timeout.rs

@@ -0,0 +1,12 @@
+use std::time::Duration;
+
+#[derive(Debug, Clone, Copy)]
+pub struct Timeout {}
+
+impl Timeout {
+    pub fn new<F>(f: F, duration: Duration) -> Timeout {
+        Timeout {}
+    }
+
+    pub fn clear(self) {}
+}