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chromium/content/test/data/media/session/media-session.html 

<!DOCTYPE html>
<html>
<head>
  <title>Test page for MediaSession.java</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
</head>
<body>
  <audio id='very-short-audio' controls>
    <source src='audio-1second.ogg'>
  </audio>
  <audio id='short-audio' controls>
    <source src='audio-4seconds.ogg'>
  </audio>
  <audio id='long-audio' controls>
    <source src='audio-6seconds.ogg'>
  </audio>
  <video id='very-short-video' controls>
    <source src='video-1second.webm'>
  </video>
  <video id='short-video' controls>
    <source src='video-4seconds.webm'>
  </video>
  <video id='long-video' controls>
    <source src='video-6seconds.webm'>
  </video>
  <video id='long-video-silent' controls>
    <source src='video-6seconds-silent.webm'>
  </video>
  <video id='long-video-loop' controls loop>
    <source src='video-6seconds.webm'>
  </video>
</body>
</html>