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chromium/content/test/data/accessibility/html/replaced-node-across-trees.html 

<!DOCTYPE html>
<html>

<body>
  <span id="s1">Before frame</span>
  <div>
    <iframe aria-label="Cross-process iframe" src="frame/static_text_2.html">
    </iframe>
  </div>
  <span id="s2">After frame</span>
</body>

</html>