This is highly specific to toolkits, but windows in Windows (wink) do not receive mouse events unless they are configured to "capture" mouse events (`SetCapture

This is highly specific to toolkits, but windows in Windows (wink) do not receive mouse events unless they are configured to "capture" mouse events (`SetCapture`). And even when there exist APIs for them, the existence of faulty websites suggests that the easiest path is probably incorrect anyway.