SVGOMFEGaussianBlurElement not animating

[James Shaw]

This is my first foray into animated svg.  This is part of my document:
<defs>
<filter id="blur" filterUnits="objectBoundingBox"><feGaussianBlur 
in="SourceGraphic" stdDeviation="0 0"/></filter>

<script type="text/ecmascript"><![CDATA[
var blur = 0;
function animate() {
	blur++;
	
	var filter = document.getElementById("blur");
	filter.firstChild.setStdDeviation(10, 10);
	
	if (blur < 10) {
		setInterval("animate()", 100);
	}
}
]]></script>
</defs>
<text font-family="Palatino Linotype" font-size="52pt" x="30pt" y="70pt" 
fill="rgb(128,128,128)" filter="url(#blur)">cadenza</text>

-----
My problem is that setStdDeviation is not animating the text.
I'm wondering if this is even supported since getStdDeviationX() and 
getStdDeviationY() return "!!! TODO"

Thanks
James Shaw
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