page_with_srcdoc_iframe_tree.html | Explore in Territory

<!doctype html>
<html>
<head></head>
<body>
  <p>This page has deeply nested iframes mixing srcdoc and src
  <p><iframe srcdoc="<iframe src=page_with_srcdoc_frame.html></iframe>" id="test_iframe"></iframe>
</body>
</html>

chromium/content/test/data/frame_tree/page_with_srcdoc_iframe_tree.html