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chromium/content/test/data/accessibility/html/frame/nested-cross-process-frame.html 

<!DOCTYPE html>
<html>
<body style="padding: 0; margin: 0;">
  <iframe width=250 height=250 src="/cross-site/2.com/accessibility/html/frame/box.html" style="border: 0; position: absolute; top: 0px; left: 100px; transform: scale(2.0); transform-origin: left top;"></iframe>
</body>
</html>