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Test Info:

<head></head>
<body>
<xul:box collapsed="true"><math:mrow><div id="div">
<p id="para">Foo bar</p>
</div></math:mrow></xul:box>
<script type="application/javascript">
document.body.offsetWidth;
try
{
var para = document.getElementById("para");
var div = document.getElementById("div");
var hbox = document.createElementNS(XUL_NS, 'hbox');
div.appendChild(hbox);
div.removeChild(para);
}
catch (e)
{
document.body.appendChild(document.createTextNode(e));
}
</script>
</body>
</html>