systrace/catapult/third_party/polymer/components/iron-overlay-behavior/test/test-menu-button.html

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<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="test-overlay.html">

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

  <template>
    <button id="trigger" on-click="toggle">Open</button>
    <test-overlay id="overlay">
      Composed overlay
      <button>button 1</button>
      <button>button 2</button>
    </test-overlay>
  </template>

</dom-module>

<script>

(function() {
  Polymer({
    is: 'test-menu-button',
    toggle: function() {
      this.$.overlay.toggle();
    }
  });
})();

</script>