<head>
  <link rel="import" href="observatory_element.html">
</head>
<polymer-element name="navigation-bar" extends="observatory-element">
  <template>
    <nav class="navbar navbar-default" role="navigation">
      <div class="navbar-header">
        <a class="navbar-brand" href="">Observatory</a>
      </div>
      <div class="collapse navbar-collapse navbar-ex1-collapse">
      </div>
    </nav>
  </template>
  <script type="application/dart" src="navigation_bar.dart"></script>
</polymer-element>