chromium/content/test/data/media/video_capture_test.html

<html>
<head>
  <script type="text/javascript" src="webrtc_test_utilities.js"></script>
  <script type="text/javascript" src="video_capture_test.js"></script>
</head>
<body>
  <table border="0">
    <tr>
      <td><video id="local-view" autoplay style="display:none"></video></td>
      <!-- The canvas is used to detect when video starts and stops. -->
      <td><canvas id="local-view-canvas" style="display:none"></canvas></td>
    </tr>
  </table>
</body>
</html>