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chromium/content/test/data/tall_page_with_local_iframe.html 

<html>
<head></head>
<body>
  <div>Tall w/ iframe.</div>
  <iframe src="page_with_scrollable_div.html"
          style="min-height: 800px; position: absolute; top: 28px; left: 8px"
          id="nested_frame"></iframe>
</body>
</html>