Fullscreen needs a click each session (browser policy).
Controllers
Each seat has its own keys and can claim a pad.
Chrome maps this pad to 0 axes, so D-pad left/right never arrive as buttons. Click the button, then pick the USB Gamepad in the chooser at the top of the Chrome window (not in this panel). Face buttons keep using the Gamepad API.
Bindings
Click a row, then press a key, a gamepad button, or this pad’s D-pad (Esc cancels).
Debug
Gameplay cheats for testing. Not saved with the file slot.