Merge pull request #1038 from ZeGentzy/web

Webmerge4

.gitignore

@@ -2,5 +2,9 @@ Cargo.lock
 target/
 rls/
 .vscode/
+util/
 *~
+*.wasm
+*.ts
+*.js
 #*#

Cargo.toml

@@ -14,7 +14,12 @@ 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"
 log = "0.4"
@@ -79,3 +84,37 @@ percent-encoding = "1.0"
 
 [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 = "0.8"
+
+[target.'cfg(target_arch = "wasm32")'.dependencies.web_sys]
+package = "web-sys"
+version = "0.3.22"
+optional = true
+features = [
+    'console',
+    '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 = "0.4.17"
+optional = true
+
+[patch.crates-io]
+stdweb = { git = "https://github.com/koute/stdweb", rev = "b3a29bb9dd9b9405540d711ed02a21cd7058d5c0"}

src/event.rs

@@ -4,7 +4,8 @@
 //! 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};
+use instant::Instant;
+use std::path::PathBuf;
 
 use crate::{
     dpi::{LogicalPosition, LogicalSize},
@@ -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

src/event_loop.rs

@@ -9,13 +9,13 @@
 //! [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};
+use instant::Instant;
+use std::ops::Deref;
+use std::{error, fmt};
 
-use crate::{
-    event::Event,
-    monitor::{AvailableMonitorsIter, MonitorHandle},
-    platform_impl,
-};
+use event::Event;
+use monitor::{AvailableMonitorsIter, MonitorHandle};
+use platform_impl;
 
 /// Provides a way to retrieve events from the system and from the windows that were registered to
 /// the events loop.
@@ -69,7 +69,7 @@ impl<T> fmt::Debug for EventLoopWindowTarget<T> {
 /// the control flow to `Poll`.
 ///
 /// [events_cleared]: ../event/enum.Event.html#variant.EventsCleared
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+#[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.

src/lib.rs

@@ -50,7 +50,7 @@
 //!     match event {
 //!         Event::EventsCleared => {
 //!             // Application update code.
-//!     
+//!
 //!             // Queue a RedrawRequested event.
 //!             window.request_redraw();
 //!         },
@@ -129,6 +129,9 @@ extern crate bitflags;
 #[cfg(any(target_os = "macos", target_os = "ios"))]
 #[macro_use]
 extern crate objc;
+#[cfg(feature = "std_web")]
+#[macro_use]
+extern crate std_web as stdweb;
 
 pub mod dpi;
 #[macro_use]

src/platform/mod.rs

@@ -21,3 +21,4 @@ pub mod unix;
 pub mod windows;
 
 pub mod desktop;
+pub mod web;

src/platform/web.rs

@@ -0,0 +1,15 @@
+#[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;
+}

src/platform_impl/mod.rs

@@ -24,6 +24,9 @@ mod platform;
 #[cfg(target_os = "emscripten")]
 #[path = "emscripten/mod.rs"]
 mod platform;
+#[cfg(target_arch = "wasm32")]
+#[path = "web/mod.rs"]
+mod platform;
 
 #[cfg(all(
     not(target_os = "ios"),
@@ -35,6 +38,7 @@ mod platform;
     not(target_os = "freebsd"),
     not(target_os = "netbsd"),
     not(target_os = "openbsd"),
-    not(target_os = "emscripten")
+    not(target_os = "emscripten"),
+    not(target_arch = "wasm32"),
 ))]
 compile_error!("The platform you're compiling for is not supported by winit");

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)
+    }
+}

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)
+    }
+}

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
+    }
+}

src/platform_impl/web/event_loop/proxy.rs

@@ -0,0 +1,19 @@
+use super::runner;
+use crate::event::Event;
+use crate::event_loop::EventLoopClosed;
+
+#[derive(Clone)]
+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> {
+        self.runner.send_event(Event::UserEvent(event));
+        Ok(())
+    }
+}

src/platform_impl/web/event_loop/runner.rs

@@ -0,0 +1,211 @@
+use super::{backend, state::State};
+use crate::event::{Event, StartCause};
+use crate::event_loop as root;
+
+use instant::{Duration, Instant};
+use std::{cell::RefCell, clone::Clone, collections::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>>>,
+}
+
+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()),
+        }))
+    }
+
+    // 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));
+    }
+
+    // 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);
+        }
+        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);
+        }
+    }
+
+    // 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,
+        }
+    }
+}

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,
+        }
+    }
+}

src/platform_impl/web/event_loop/window_target.rs

@@ -0,0 +1,162 @@
+use super::{backend, device, proxy::Proxy, runner, window};
+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 register(&self, canvas: &mut backend::Canvas) {
+        let runner = self.runner.clone();
+        canvas.on_blur(move || {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(window::Id),
+                event: WindowEvent::Focused(false),
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_focus(move || {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(window::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(window::Id),
+                event: WindowEvent::KeyboardInput {
+                    device_id: DeviceId(unsafe { device::Id::dummy() }),
+                    input: KeyboardInput {
+                        scancode,
+                        state: ElementState::Pressed,
+                        virtual_keycode,
+                        modifiers,
+                    },
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_keyboard_release(move |scancode, virtual_keycode, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(window::Id),
+                event: WindowEvent::KeyboardInput {
+                    device_id: DeviceId(unsafe { device::Id::dummy() }),
+                    input: KeyboardInput {
+                        scancode,
+                        state: ElementState::Released,
+                        virtual_keycode,
+                        modifiers,
+                    },
+                },
+            });
+        });
+
+        let runner = self.runner.clone();
+        canvas.on_received_character(move |char_code| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(window::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(window::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(window::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(window::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(window::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(window::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(window::Id),
+                event: WindowEvent::MouseWheel {
+                    device_id: DeviceId(device::Id(pointer_id)),
+                    delta,
+                    phase: TouchPhase::Moved,
+                    modifiers,
+                },
+            });
+        });
+    }
+}

src/platform_impl/web/mod.rs

@@ -0,0 +1,31 @@
+// TODO: dpi
+// TODO: close events (stdweb PR required)
+// TODO: pointer locking (stdweb PR required)
+// TODO: mouse wheel events (stdweb PR required)
+// TODO: key event: .which() (stdweb PR)
+// TODO: should there be a maximization / fullscreen API?
+
+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;
+
+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;
+pub use self::window::{
+    Id as WindowId, PlatformSpecificBuilderAttributes as PlatformSpecificWindowBuilderAttributes,
+    Window,
+};

src/platform_impl/web/monitor.rs

@@ -0,0 +1,22 @@
+use crate::dpi::{PhysicalPosition, PhysicalSize};
+
+#[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 {
+        unimplemented!();
+    }
+
+    pub fn dimensions(&self) -> PhysicalSize {
+        unimplemented!();
+    }
+
+    pub fn name(&self) -> Option<String> {
+        unimplemented!();
+    }
+}

src/platform_impl/web/stdweb/canvas.rs

@@ -0,0 +1,251 @@
+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::rc::Rc;
+use stdweb::traits::IPointerEvent;
+use stdweb::unstable::TryInto;
+use stdweb::web::event::{
+    BlurEvent, ConcreteEvent, FocusEvent, KeyDownEvent, KeyPressEvent, KeyUpEvent, MouseWheelEvent,
+    PointerDownEvent, PointerMoveEvent, PointerOutEvent, PointerOverEvent, PointerUpEvent,
+};
+use stdweb::web::html_element::CanvasElement;
+use stdweb::web::{
+    document, window, EventListenerHandle, IChildNode, IElement, IEventTarget, IHtmlElement, INode,
+};
+
+pub struct Canvas {
+    raw: CanvasElement,
+    on_redraw: Rc<dyn Fn()>,
+    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>,
+}
+
+impl Drop for Canvas {
+    fn drop(&mut self) {
+        self.raw.remove();
+    }
+}
+
+impl Canvas {
+    pub fn create<F>(on_redraw: F) -> Result<Self, RootOE>
+    where
+        F: 'static + Fn(),
+    {
+        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())))?;
+
+        document()
+            .body()
+            .ok_or_else(|| os_error!(OsError("Failed to find body node".to_owned())))?
+            .append_child(&canvas);
+
+        // TODO: Set up unique ids
+        canvas
+            .set_attribute("tabindex", "0")
+            .expect("Failed to set a tabindex");
+
+        Ok(Canvas {
+            raw: canvas,
+            on_redraw: Rc::new(on_redraw),
+            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,
+        })
+    }
+
+    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 request_redraw(&self) {
+        let on_redraw = self.on_redraw.clone();
+        window().request_animation_frame(move |_| on_redraw());
+    }
+
+    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_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_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_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_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_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));
+            }
+        }));
+    }
+
+    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);
+        })
+    }
+}

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::{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}.key_code; );
+
+    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()
+}

src/platform_impl/web/stdweb/mod.rs

@@ -0,0 +1,21 @@
+mod canvas;
+mod event;
+mod timeout;
+
+pub use self::canvas::Canvas;
+pub use self::timeout::Timeout;
+
+use crate::platform::web::WindowExtStdweb;
+use crate::window::Window;
+
+use stdweb::web::html_element::CanvasElement;
+
+pub fn throw(msg: &str) {
+    js! { throw @{msg} }
+}
+
+impl WindowExtStdweb for Window {
+    fn canvas(&self) -> CanvasElement {
+        self.window.canvas().raw().clone()
+    }
+}

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();
+    }
+}

src/platform_impl/web/web_sys/canvas.rs

@@ -0,0 +1,257 @@
+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 wasm_bindgen::{closure::Closure, JsCast};
+use web_sys::{FocusEvent, HtmlCanvasElement, KeyboardEvent, PointerEvent, WheelEvent};
+
+pub struct Canvas {
+    raw: HtmlCanvasElement,
+    on_redraw: Closure<dyn Fn()>,
+    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)>>,
+}
+
+impl Drop for Canvas {
+    fn drop(&mut self) {
+        self.raw.remove();
+    }
+}
+
+impl Canvas {
+    pub fn create<F>(on_redraw: F) -> Result<Self, RootOE>
+    where
+        F: 'static + Fn(),
+    {
+        let window = web_sys::window().expect("Failed to obtain window");
+        let document = window.document().expect("Failed to obtain document");
+
+        let canvas: HtmlCanvasElement = document
+            .create_element("canvas")
+            .map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?
+            .unchecked_into();
+
+        document
+            .body()
+            .ok_or_else(|| os_error!(OsError("Failed to find body node".to_owned())))?
+            .append_child(&canvas)
+            .map_err(|_| os_error!(OsError("Failed to append canvas".to_owned())))?;
+
+        // TODO: Set up unique ids
+        canvas
+            .set_attribute("tabindex", "0")
+            .expect("Failed to set a tabindex");
+
+        Ok(Canvas {
+            raw: canvas,
+            on_redraw: Closure::wrap(Box::new(on_redraw) as Box<dyn Fn()>),
+            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,
+        })
+    }
+
+    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 request_redraw(&self) {
+        let window = web_sys::window().expect("Failed to obtain window");
+        window
+            .request_animation_frame(&self.on_redraw.as_ref().unchecked_ref())
+            .expect("Failed to request animation frame");
+    }
+
+    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_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_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_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_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_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));
+            }
+        }));
+    }
+
+    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
+    }
+}

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()
+}

src/platform_impl/web/web_sys/mod.rs

@@ -0,0 +1,20 @@
+mod canvas;
+mod event;
+mod timeout;
+
+pub use self::canvas::Canvas;
+pub use self::timeout::Timeout;
+
+use crate::platform::web::WindowExtWebSys;
+use crate::window::Window;
+use web_sys::HtmlCanvasElement;
+
+pub fn throw(msg: &str) {
+    wasm_bindgen::throw_str(msg);
+}
+
+impl WindowExtWebSys for Window {
+    fn canvas(&self) -> HtmlCanvasElement {
+        self.window.canvas().raw().clone()
+    }
+}

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);
+    }
+}

src/platform_impl/web/window.rs

@@ -0,0 +1,268 @@
+use crate::dpi::{LogicalPosition, LogicalSize};
+use crate::error::{ExternalError, NotSupportedError, OsError as RootOE};
+use crate::event::{Event, WindowEvent};
+use crate::icon::Icon;
+use crate::monitor::MonitorHandle as RootMH;
+use crate::window::{CursorIcon, WindowAttributes, WindowId as RootWI};
+
+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>,
+}
+
+impl Window {
+    pub fn new<T>(
+        target: &EventLoopWindowTarget<T>,
+        attr: WindowAttributes,
+        _: PlatformSpecificBuilderAttributes,
+    ) -> Result<Self, RootOE> {
+        let runner = target.runner.clone();
+
+        let mut canvas = backend::Canvas::create(move || {
+            runner.send_event(Event::WindowEvent {
+                window_id: RootWI(Id),
+                event: WindowEvent::RedrawRequested,
+            })
+        })?;
+
+        target.register(&mut canvas);
+
+        let window = Window {
+            canvas,
+            previous_pointer: RefCell::new("auto"),
+            position: RefCell::new(LogicalPosition { x: 0.0, y: 0.0 }),
+        };
+
+        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.canvas.request_redraw();
+    }
+
+    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> {
+        // TODO: pointer capture
+        Ok(())
+    }
+
+    #[inline]
+    pub fn set_cursor_grab(&self, _grab: bool) -> Result<(), ExternalError> {
+        // TODO: pointer capture
+        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) {
+        // TODO: should there be a maximization / fullscreen API?
+    }
+
+    #[inline]
+    pub fn fullscreen(&self) -> Option<RootMH> {
+        // TODO: should there be a maximization / fullscreen API?
+        None
+    }
+
+    #[inline]
+    pub fn set_fullscreen(&self, _monitor: Option<RootMH>) {
+        // TODO: should there be a maximization / fullscreen API?
+    }
+
+    #[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) {
+        // TODO: what is this?
+    }
+
+    #[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 {
+        // TODO ?
+        unsafe { Id::dummy() }
+    }
+}
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Id;
+
+impl Id {
+    pub unsafe fn dummy() -> Id {
+        Id
+    }
+}
+
+#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct PlatformSpecificBuilderAttributes;

test.html

@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <script type="module">
+      import { default as init } from './window.js';
+
+      async function run() {
+        console.log("Loading");
+        await init('./window_bg.wasm');
+        console.log("Loaded");
+      }
+
+      run();
+    </script>
+  </head>
+
+  <body>
+    <canvas id="test_canvas"></canvas>
+  </body>
+</html>

test.ps1

@@ -0,0 +1,2 @@
+cargo build --target wasm32-unknown-unknown --features web_sys --example window
+wasm-bindgen .\target\wasm32-unknown-unknown\debug\examples\window.wasm --out-dir . --target web