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third_party/polymer/components/iron-menu-behavior/iron-menu-behavior.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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@@ skipping 110 matching lines @@
      * Given a KeyboardEvent, this method will focus the appropriate item in the
      * menu (if there is a relevant item, and it is possible to focus it).
      *
      * @param {KeyboardEvent} event A KeyboardEvent.
      */
     _focusWithKeyboardEvent: function(event) {
       for (var i = 0, item; item = this.items[i]; i++) {
         var attr = this.attrForItemTitle || 'textContent';
         var title = item[attr] || item.getAttribute(attr);
 
-        if (!item.hasAttribute('disabled') && title && 
+        if (!item.hasAttribute('disabled') && title &&
             title.trim().charAt(0).toLowerCase() === String.fromCharCode(event.keyCode).toLowerCase()) {
           this._setFocusedItem(item);
           break;
         }
       }
     },
 
     /**
      * Focuses the previous item (relative to the currently focused item) in the
      * menu, disabled items will be skipped.
@@ skipping 60 matching lines @@
     },
 
     /**
      * A handler that responds to mutation changes related to the list of items
      * in the menu.
      *
      * @param {CustomEvent} event An event containing mutation records as its
      * detail.
      */
     _onIronItemsChanged: function(event) {
-      var mutations = event.detail;
-      var mutation;
-      var index;
-
-      for (index = 0; index < mutations.length; ++index) {
-        mutation = mutations[index];
-
-        if (mutation.addedNodes.length) {
-          this._resetTabindices();
-          break;
-        }
+      if (event.detail.addedNodes.length) {
+        this._resetTabindices();
       }
     },
 
     /**
      * Handler that is called when a shift+tab keypress is detected by the menu.
      *
      * @param {CustomEvent} event A key combination event.
      */
     _onShiftTabDown: function(event) {
       var oldTabIndex = this.getAttribute('tabindex');
@@ skipping 101 matching lines @@
   Polymer.IronMenuBehaviorImpl._shiftTabPressed = false;
 
   /** @polymerBehavior Polymer.IronMenuBehavior */
   Polymer.IronMenuBehavior = [
     Polymer.IronMultiSelectableBehavior,
     Polymer.IronA11yKeysBehavior,
     Polymer.IronMenuBehaviorImpl
   ];
 
 </script>