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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/support/005b.html 

<!DOCTYPE HTML>
<script>
 var t = parent.opener.t;
 var do_test = t.step_func(function () {
   localStorage.test6564729 += '5';
   var s = 'FAIL: document.open() has canceled the navigation (' + localStorage.test6564729 + ')';
   parent.document.open();
   parent.document.write(s);
   parent.document.close();
   localStorage.test6564729 += parent.document.body.textContent.match('FAIL') == s ? 'X' : '6';
   localStorage.test6564729 += '7';
 });
</script>
<body onbeforeunload="localStorage.test6564729 += '2'"
      onpagehide="do_test()"
      onunload="localStorage.test6564729 += '8'">
<p>Inner frame