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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/browsing-context-names/resources/choose-_parent-002-window.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: browsing context name - parent: top-level context</title>
<iframe name="iframeParent" src="choose-_parent-002-iframe.html"></iframe>
<script>
// Relay a message from child context to opener context
window.addEventListener('message', e => {
  if (window.opener) {
    window.opener.postMessage(e.data, '*');
  }
});
</script>