Gamepad3

Gamepad.js

/**
   * Polls the navigator.*Gamepads object for all gamepads connected 
   */
  function pollGamepads() {
    var rawGamepads =
            (navigator.webkitGetGamepads && navigator.webkitGetGamepads()) ||
            navigator.webkitGamepads || navigator.mozGamepads ||
            navigator.msGamepads || navigator.gamepads;
    if (rawGamepads) {
      self.gamepads = [];
      for (var i = 0; i < rawGamepads.length; i++) {
        if (typeof rawGamepads[i] !== prevRawGamepadTypes[i]) {
          prevRawGamepadTypes[i] = typeof rawGamepads[i];
        }
        if (rawGamepads[i]) {
          self.gamepads.push(rawGamepads[i]);
        }
      }
    }
  }