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Test Info:

<head>
<script>
<![CDATA[
function boom()
{
document.documentElement.offsetHeight;
var div = document.createElementNS("http://www.w3.org/1999/xhtml", "div");
div.style.cssFloat = "left";
document.getElementById("a").appendChild(div);
}
]]>
</script>
</head>
<body onload="boom();">
<fieldset id="a"><legend style="display: table-footer-group;"></legend></fieldset>
</body>
</html>