gecko-dev/layout/base/crashtests/537624-1.html

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HTML
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<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
function boom()
{
var a = document.getElementById("a");
var b = document.getElementById("b");
a.insertBefore(b, a.firstChild);
}
</script>
</head>
<body onload="boom();"><span id="a"><div></div></span><span id="b"><span style="display: none;"></span><span style="display: none;"></span></span></body>
</html>