code: function() {
  
          /**
           * When user begins to interact with connected gamepad:
           *
           * @see https://w3c.github.io/gamepad/#dom-gamepadevent
           */
          vendor.addEventListener(window, 'gamepadconnected', this._checkGamepadCompatibility);
  
          if (this.timeline) {
              this.timeline.on('frame', this.update);
          }
  
          vendor.addEventListener(window, 'gamepaddisconnected', this._disconnectGamepad);
  
      }
docs: Init. control.