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

<!DOCTYPE HTML>
<body onbeforeunload="localStorage.test6564729 += '5'"
      onpagehide="localStorage.test6564729 += '8'"
      onunload="localStorage.test6564729 += '9'">
<p>Inner frame