What System OS are you using?
Viewing post in Infinite Jump - The Platformer jam comments
Good to know! Will remember it for the next time. Also the website says te following:
Godot 4's HTML5 exports currently cannot run on macOS and iOS due to upstream bugs with SharedArrayBuffer and WebGL 2.0. We recommend usingmacOS and iOS native export functionality instead, as it will also result in better performance.