<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style id="style">p { color: red; }</style>
<script>
<![CDATA[

function boom()
{
	var styleText = "p { color: green; }";
	
	// Make 2^17 rules
	for (var i = 0; i < 17; ++i) {
	  styleText += styleText;
	}

	document.getElementById("style").firstChild.data = styleText;
    
    document.body.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", "mrow"));
}

]]>
</script>
</head>

<body onload="boom();"><p>This should be green</p></body>

</html>