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<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var mspace = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mspace");
var emptyset = document.createElementNS("http://www.w3.org/1998/Math/MathML", "emptyset");
emptyset.setAttributeNS(null, "mathvariant", "3");
mspace.appendChild(emptyset);
document.body.appendChild(mspace);
emptyset.removeAttribute('mathvariant');
}
</script>
</head>
<body onload="boom()"></body>
</html>
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