works fine for me on windows/firefox/xbox one controller. i think something that would be nice if possible is to have presets for xbox, ps, and switch, so that players don't have to go through the mapper if they have a common controller, plus that way it could enable the use of manufacturer specific button prompts re: gimmick's idea. though you said the mapping is inconsistent across browsers so i'm not sure if that would be practical. cool system!
Gimmick
Neat! Could this be combined with the controller/key prompts pack (https://thoseawesomeguys.com/prompts/) for a consistent game input prompt library of sorts?
3p0ch
Hmm, maybe? I intentionally designed the mapper to be agnostic of what type of gamepad you're using -- so players can use their XBox, PS, Switch, or whatever other gamepad they happen to have. As long as they can plug it into a USB drive and it has enough buttons and stick axes it should work. So players might get confused if they see symbols for a specific company's gamepad and think they need that particular one, when really they don't.