web: Fix position of touch events to be relative to the canvas

Use the same logic as for mouse events when not captured.

CHANGELOG.md

@@ -49,6 +49,7 @@ And please only add new entries to the top of this list, right below the `# Unre
 - On Wayland, drop `WINIT_WAYLAND_CSD_THEME` variable.
 - Implement `PartialOrd` and `Ord` on types in the `dpi` module.
 - Bump MSRV from `1.60` to `1.64`.
+- Web: Fix position of touch events to be relative to the canvas.
 
 # 0.28.6
 

src/platform_impl/web/web_sys/event.rs

@@ -127,10 +127,6 @@ pub fn mouse_modifiers(event: &MouseEvent) -> ModifiersState {
     state
 }
 
-pub fn touch_position(event: &PointerEvent, _canvas: &HtmlCanvasElement) -> LogicalPosition<f64> {
+pub fn touch_position(event: &PointerEvent, canvas: &HtmlCanvasElement) -> LogicalPosition<f64> {
-    // TODO: Should this handle more, like `mouse_position_by_client` does?
+    mouse_position_by_client(event, canvas)
-    LogicalPosition {
-        x: event.client_x() as f64,
-        y: event.client_y() as f64,
-    }
 }