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chromium/content/test/data/accessibility/html/iframe-cross-process.html 

<!DOCTYPE html>
<!--
@WIN-ALLOW:ia2_hypertext=*
-->
<html>
<body>
<p>Before frame</p>
<div>
  <iframe aria-label="Cross-process iframe"
      src="/cross-site/1.com/accessibility/html/frame/static_text.html">
  </iframe>
</div>
<p>After frame</p>
</body>
</html>