code: function SettingsFlyout_addFirstDiv() {
                      var _elms = this._element.getElementsByTagName("*");
                      var _minTab = 0;
                      for (var i = 0; i < _elms.length; i++) {
                          if ((0 < _elms[i].tabIndex) && (_minTab === 0 || _elms[i].tabIndex < _minTab)) {
                              _minTab = _elms[i].tabIndex;
                          }
                      }
                      var firstDiv = _Global.document.createElement("div");
                      firstDiv.className = _Constants.firstDivClass;
                      firstDiv.style.display = "inline";
                      firstDiv.setAttribute("role", "menuitem");
                      firstDiv.setAttribute("aria-hidden", "true");
                      firstDiv.tabIndex = _minTab;
                      _ElementUtilities._addEventListener(firstDiv, "focusin", this._focusOnLastFocusableElementFromParent, false);
  
                      // add to beginning
                      if (this._element.children[0]) {
                          this._element.insertBefore(firstDiv, this._element.children[0]);
                      } else {
                          this._element.appendChild(firstDiv);
                      }
                  }
docs: Create and add a new first div to the beginning of the list