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Test Info:

<head>
<script>
function boom()
{
var span = document.getElementById("s");
var newSpan = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
span.appendChild(newSpan);
}
</script>
</head>
<body onload="boom();">
<math:math><span id="s"><div/></span></math:math>
</body>
</html>