Weird issues in WebView2 / WinUI3: handling the ALT key

Applies to: WinUI3 apps with a WebView2 and a menu Problem: Normally users press the "Alt" ("Menu") key to use an app's menu. But after the user clicks on a WebView2 (as one does; it's a common practice), all Alt keys will be swallowed up by the WebView2. Solution: capture the 'Alt' key and use that as a trigger to move focus. In the JavaScript for the one specific page I use, add a 'keydown'…