docs: function (element, event, callback, scope, args, useCapture) {
  
                  if (!callback) {
                      return false;
                  }
  
                  var normalized = this._normalizeTargetAndEvent(element, event);
                  element = normalized.element;
                  event = normalized.event;
  
                  if (!this.typesUtil.isFunction(callback)) {
                      useCapture = scope;
                  }
                  var capture = ((event == FOCUSIN || event == FOCUSOUT) && !this.UA.ie) ? true : useCapture;
                  return this._addListener(element, this._getType(event), callback, scope, args, capture);
  
              }