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chromium
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chromium/content/test/data/page_with_sandboxed_iframe.html 

<html>

<head></head>

<body>
  <img src="image.jpg" />
  <p>This page has an iframe. Yay for iframes!
    <p><iframe sandbox="allow-scripts" allow="private-state-token-issuance" src="title1.html" id="test_iframe"></iframe>
</body>

</html>