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chromium
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chromium/content/test/data/super_tall_parent.html 

<html>
  <head>
  </head>
  <body>
    <div>This page contains a super-tall iframe.</div>
    <iframe style="min-height: 31000px; min-width: 500px" src="about:blank">
    </iframe>
  </body>
</html>