Takes the pointer events on the canvas ahead of the app's own handlers, for a mode of the
inspector that uses the pointer itself. The listeners sit in the capture phase on the window, so
they run before any listener of the app, and stop the events there.
Takes the pointer events on the canvas ahead of the app's own handlers, for a mode of the inspector that uses the pointer itself. The listeners sit in the capture phase on the window, so they run before any listener of the app, and stop the events there.