code: function focusFirstMenuItem(pane) {
  	    var tabFocus = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  
  	    if (this.elements.settings.popup.hidden) {
  	      return;
  	    }
  
  	    var target = pane;
  
  	    if (!is$1.element(target)) {
  	      target = Object.values(this.elements.settings.panels).find(function (pane) {
  	        return !pane.hidden;
  	      });
  	    }
  
  	    var firstItem = target.querySelector('[role^="menuitem"]');
  	    setFocus.call(this, firstItem, tabFocus);
  	  }
docs: Focus the first menu item in a given (or visible) menu