runtime/observatory/lib/src/elements/json_view.html

<link rel="import" href="../../../../packages/polymer/polymer.html">

<polymer-element name="json-view">
  <template>
    <nav-bar>
      <top-nav-menu last="{{ true }}"></top-nav-menu>
      <nav-notify notifications="{{ app.notifications }}"></nav-notify>
    </nav-bar>
      <pre>{{ mapAsString }}</pre>
  </template>
</polymer-element>

<script type="application/dart" src="json_view.dart"></script>