My Share Button Opens The Overlay Instead Of Registering In The Test

Not daft, and it is a limitation worth explaining because it affects three buttons on most controllers and people assume they are broken.

Some controller buttons are claimed by the operating system at a level above any application. On Windows the Xbox button and the Share button are wired to the Game Bar, and on a console the equivalent buttons belong to the system interface. When the OS claims a button, it consumes the event and never passes it on, so a web page genuinely cannot see it. This is not a browser limitation or a gap in the Gamepad API; the input is intercepted before the browser is involved. The same applies to the PS button on a DualSense and the Home button on a Switch Pro Controller.

The good news is that on Windows you can stop the interception. In Windows settings under Gaming, turn off the setting that lets the Xbox button open Game Bar. With that off, Share and the Xbox button stop triggering the overlay and start arriving at the page like ordinary buttons, and the menu buttons test will show them. Remember to turn it back on afterwards if you use the Game Bar for captures.

On a console there is no equivalent switch, so test those buttons on a PC instead. That is the practical route and it tells you what you need: if the button registers on a PC with the Game Bar shortcut disabled, the button hardware is fine and anything odd on the console is a console setting rather than a fault.

One more thing worth knowing while you are testing these buttons. The Share and Xbox buttons on this controller sit on the same small membrane as each other, so if one is genuinely dead it is worth testing both, since a membrane fault often takes out its neighbour at around the same time.