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

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

<polymer-element name="error-view">
  <template>
    <link rel="stylesheet" href="css/shared.css">
    <nav-bar>
      <top-nav-menu last="{{ true }}"></top-nav-menu>
      <nav-notify notifications="{{ app.notifications }}"></nav-notify>
    </nav-bar>
    <div class="content-centered">
      <h1>{{ error.kind }}</h1>
      <br>
      <div class="well">{{ error.message }}</div>
    </div>
    <view-footer></view-footer>
  </template>
</polymer-element>

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