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

<!doctype html>
<meta charset=utf-8>
<title>IFrame discards are processed synchronously</title>
<body></body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  async_test(function(t) {
    var child = document.createElement("iframe");
    child.src = "support/blank.htm?1";
    child.onload = t.step_func(function () {
      var childWindow = child.contentWindow;
      var grandchild = childWindow.document.createElement("iframe");
      grandchild.src = "blank.htm?2";
      grandchild.onload = t.step_func(function () {
        var grandchildWindow = grandchild.contentWindow;
        assert_equals(child.contentWindow, childWindow, "child window");
        assert_equals(childWindow.parent, window, "child parentage");
        assert_equals(grandchild.contentWindow, grandchildWindow, "grandchild window");
        assert_equals(grandchildWindow.parent, childWindow, "grandchild parentage");
        document.body.removeChild(child);
        assert_equals(child.contentWindow, null, "child should be discarded");
        assert_equals(childWindow.parent, null, "child window should be discarded");
        assert_equals(grandchild.contentWindow, null, "grandchild should be discarded");
        assert_equals(grandchildWindow.parent, null, "grandchild window should be discarded");
        t.done();
      });
      childWindow.document.body.appendChild(grandchild);
    });
    document.body.appendChild(child);
  });
</script>