_getFocusableItems() {
      const items = this._links;
      if (!this._isOverflowEmpty) {
        items.unshift(this._dropdownArrowLink);
      }
      if (this._endsWithCurrentLocationLabel) {
        items.push(this._labelFocusAdaptor);
      }
      return items;
    }
Obtains the items for navigation via keyboard
@private