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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html 

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<iframe id="i" src="about:blank"></iframe>
<script>
async_test(t => {
  var form = i.contentDocument.createElement('form');
  form.action = '/common/blank.html';
  i.contentDocument.body.appendChild(form);
  i.onload = t.step_func_done(() => {});
  form.submit();
  new Document().prepend(form);
});
</script>
</body>