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

<!DOCTYPE HTML>
<p>FAIL</p>
<script>
opener.t.step(function() {
  opener.assert_equals(localStorage.test6564729, 'ABCDEFGHIJKLMN');
  opener.t.done();
});
</script>