code: function Engine() {
        var _this;
  
        var ua = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
        var flags = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
        var cssFlagsPrefix = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 'engine';
  
        _classCallCheck(this, Engine);
  
        _this = _possibleConstructorReturn(this, _getPrototypeOf(Engine).call(this, ua, flags, cssFlagsPrefix));
        _this.version = 'n/a';
        return _this;
      }
docs: Creates an instance of Engine.
  @param {any} [ua=null]
  @param {any} [flags={}]
  @param {string} [cssFlagsPrefix='engine']
  
  @memberOf Engine