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Test Info:

<head>
<script>
function boom()
{
document.getElementById("td").contentEditable = "true";
document.execCommand("justifyfull", false, null);
}
</script>
</head>
<body onload="boom();">
<m:msubsup><td id="td"><m:mn/></td></m:msubsup>
</body>
</html>