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

<script src="iframe_harness.js"></script>
<body>
  <iframe src="same_origin_grandchild.html"></iframe>
</body>
<script>
    send_test_results({
        "id": '08782f28-e313-47ae-8cd7-419f3e194b0a',
        "parent": window.parent !== window,
        "grandparent": window.parent.parent === window.parent,
        "top": window.top === window.parent,
    });
</script>