1412173.html - mozsearch

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<!DOCTYPE html>

<html class="reftest-wait">

<head>

<script>

let f = document.createElement('frame');

f.onload = function() {

  let frameDocument = f.contentDocument;

  frameDocument.body.onbeforeunload = function () { frameDocument.write('<p>beforeUnload</p>') };

  frameDocument.write('<p>trigger unload</p>')

  window.stop();

  document.documentElement.className = '';

};

document.documentElement.appendChild(f);

</script>

</head>

<body>

</body>

</html>