jellyfin-web/dashboard-ui/bower_components/iron-menu-behavior/test/test-menu.html

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<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../iron-menu-behavior.html">

<dom-module id="test-menu">

  <template>

    <content></content>

    <div id="extraContent" tabindex="-1">focusable extra content</div>

  </template>

</dom-module>

<script>

(function() {

  Polymer({

    is: 'test-menu',

    behaviors: [
      Polymer.IronMenuBehavior
    ],

    get extraContent() {
      return this.$.extraContent;
    }

  });

})();

</script>