docs: function (evt) {
              var evtType = evt.type;
              if (this._cfg.disabled && this._cfg.waiAria && (evtType === "mousedown" || evtType === "click")) {
                  // When the tab is disabled it is necessary to prevent the default action when clicking on the link
                  // both to prevent the focus (on mousedown) and the navigation (on click)
                  evt.target.unselectable = true; // for old IE versions for which preventDefault on mousedown does not prevent the focus
                  evt.preventDefault();
              }
              return this.$Container.delegate.apply(this, arguments);
          }