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

<!doctype html>
<meta charset="utf-8">
<title>Change the frame heriarchy</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
  <iframe src="change_child.html"></iframe>
</body>
<script>
    async_test(function(t) {
        var timer = window.setInterval(t.step_func(poll), 100);
        function poll() {
            // We wait for the grandchild's script to set the custom attribtue.
            // Note that if this test passes, the grandchild's script must have been run twice,
            // once to trigger the move from the child to here, and once to pass this test.
            if (document.body.getAttribute("data-contains-grandchild")) {
                window.clearTimeout(timer);
                t.done();
            }
        }
    });
</script>