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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-iframe-element/cross_origin_child.html 

<script src="iframe_harness.js"></script>
<body>
  <iframe src="cross_origin_grandchild.html"></iframe>
</body>
<script>
    send_test_results({
        "id": '79a52de8-4222-427e-92db-caec28e75f8e',
        "parent": window.parent !== window,
        "grandparent": window.parent.parent === window.parent,
        "top": window.top === window.parent,
    });
</script>