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third_party/polymer/components/paper-menu-button/paper-menu-button.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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       id="dropdown"
       opened="{{opened}}"
       horizontal-align="[[horizontalAlign]]"
       vertical-align="[[verticalAlign]]"
       horizontal-offset="[[horizontalOffset]]"
       vertical-offset="[[verticalOffset]]"
       open-animation-config="[[openAnimationConfig]]"
       close-animation-config="[[closeAnimationConfig]]"
       no-animations="[[noAnimations]]"
       focus-target="[[_dropdownContent]]"
+      restore-focus-on-close
       on-iron-overlay-canceled="__onIronOverlayCanceled">
       <div class="dropdown-content">
         <content id="content" select=".dropdown-content"></content>
       </div>
     </iron-dropdown>
   </template>
 
   <script>
     (function() {
       'use strict';
@@ skipping 263 matching lines @@
         }
       });
 
       PaperMenuButton.ANIMATION_CUBIC_BEZIER = 'cubic-bezier(.3,.95,.5,1)';
       PaperMenuButton.MAX_ANIMATION_TIME_MS = 400;
 
       Polymer.PaperMenuButton = PaperMenuButton;
     })();
   </script>
 </dom-module>