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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/support/004b.html 

<!DOCTYPE HTML>
<script>
 function testRun() {
   localStorage.test6564729 += 'H';
   var d = parent.document;
   var e = parent.document.open(); // no effect, since that document is already in unload
   localStorage.test6564729 += (e == d) ? 'I' : 'X';
   var s = 'FAIL';
   document.write(s);
   localStorage.test6564729 += document.body.textContent == s ? 'x' : 'J';
   document.close();
   localStorage.test6564729 += 'K';
 }
</script>
<body onbeforeunload="localStorage.test6564729 += 'D'"
      onpagehide="localStorage.test6564729 += 'G'"
      onunload="testRun()">
<p>Inner frame