Gamepad2

Gamepad.js

if (self.supported) {
    // Firefox 
    window.addEventListener('MozGamepadConnected',
            onGamepadConnect, false);
    window.addEventListener('MozGamepadDisconnected',
            onGamepadDisconnect, false);

    // Chrome
    if (navigator.webkitGetGamepads && navigator.webkitGetGamepads()) {
      startPolling();
    }
  }