The resolution is 2560 x 1600, but I checked with 1920 x 1080, and it still didn't work. The browser is Opera, and the system is Windows 11. But now I've noticed that some things (for example, transition from the menu to the game) go beyond this reduced resolution, so there may be some UI scaling issue. I don't know Godot very well, but in Unity, the UI often breaks in the browser. Hope this helps!