<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style>
mtd:first-letter { }
</style>
<script>
function boom()
{
var b = document.body;
document.documentElement.removeChild(b);
document.documentElement.offsetHeight;
document.documentElement.appendChild(b);
var t = document.getElementById('t');
t.removeChild(t.firstChild);
}
</script>
</head>
<body onload="boom();">
<mtd xmlns="http://www.w3.org/1998/Math/MathML" id="t">s</mtd>
</body>
</html>