chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/support/003-1.html

<!DOCTYPE HTML>
<script>
 var t = opener.t;
 var do_test = t.step_func(function() {
   localStorage.test6564729 += '1';
   var d = document;
   var e = document.open(); // has no effect (ignore-opens-during-unload > 0 because we're in beforeunload)
   localStorage.test6564729 += (e == d) ? '2' : 'A [' + e + '] ';
   document.write('FAIL - document.write executed and blocked navigation!'); // has no effect (ignore-opens-during-unload > 0)
   localStorage.test6564729 += document.body.textContent.match('FAIL') ? 'B' : '3';
   document.close(); // has no effect (no script-created parser)
   localStorage.test6564729 += '4';
 })

 onload=t.step_func(function() {localStorage.test6564729 = '0'; setTimeout(t.step_func(function() {document.links[0].click()}), 100)})

</script>
<body
      onbeforeunload="do_test()"
      onpagehide="localStorage.test6564729 += '6'"
      onunload="localStorage.test6564729 += '7'">
<p><a href="003a.html">Follow this link to run the test.</a>
<p><iframe src="003b.html"></iframe>