Bluetooth PlayStation, Xbox & universal controllers: pair in your device's Bluetooth settings, then press any button.
Bluetooth controllers work through your browser's Gamepad API once paired in the phone/PC Bluetooth settings (PS4 DualShock 4, PS5 DualSense, Xbox Wireless, and most "universal" HID gamepads). iPhone/iPad: Safari supports PS & Xbox controllers. Press any button after pairing so the browser exposes it.