chromium/tools/perf/page_sets/media_cases/mse.html

<!doctype html>
<!-- This page is used to test Media Source Extensions implementation. -->
<html>
  <head>
    <title>Media Source Extensions (MSE) Performance Test</title>
    <script src="mse.js"> </script>
  </head>
  <body>
    <div>
      <video controls style="width: 640px; height: 360px;" id="video_id"></video>
    </div>
    <script>
      __test();
    </script>
  </body>
</html>