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Test Info:

<html class="reftest-wait">↩
<head>↩
<script>↩
function boom()↩
{↩
document.getElementById("frameset").removeChild(document.getElementById("frame"));↩
document.documentElement.removeAttribute("class");↩
}↩
</script>↩
</head>↩
<frameset id="frameset" onload="setTimeout(boom, 100)">↩
<frame id="frame" src="data:text/html,<body onUnload=&quot;location = 'http://www.mozilla.org/'&quot;>This frame's onunload tries to load another page.">↩
</frameset>↩
</html>↩