I'm trying to use a CSS3 (webkit) drop-shadow filter to place a white glow around any given transparent png with approximately the same dimensions, and
-webkit-filter: drop-shadow(0px 0px 22px rgba(255,255,255,0.8));
Well, I figured out how to replace the non-functioning spread property using SVG filters. Big thanks to Michael Mullany though his answer wasn't 100% what I need. Here's the filter I'm using:
<filter id="drop-shadow"> <feMorphology operator="dilate" radius="6" in="SourceAlpha" result="dilated"/> <feGaussianBlur stdDeviation="3" in="dilated" result="blurred"/> <feFlood flood-color="rgba(255,255,255,0.5)" in="blurred" result="flooded"/> <feMerge> <feMergeNode/> <feMergeNode in="SourceGraphic"/> </feMerge> </filter>
feMorphology dilate operator replicates the functionality I wanted very nicely, making it easier to give the text a 'glow' effect that conforms a lot more strictly to the outline of the text.
(Oddly, feFlood does nothing and I'm unable to get a white glow, but that's a problem for another question. The filter also eats up 100% of a single core as long as it's open in a tab in the latest Chrome. Oh well.)