<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
var a = document.createElementNS("http://www.w3.org/2000/svg", "foo");
var b = document.createElementNS("http://www.w3.org/1998/Math/MathML", "math");
</script>
</head>
<body></body>
</html>