Well only problem is that "clip-path", "mask" and "filter" (no not the IE "filter" but SVG "filter") only works for Firefox and Safari (yes no Chrome). And they do it differently. Firefox needs an svg clippath specified via an id eg:
.box { clip-path: url("roundedrect.svg#cp1"); }
while Safari just uses the shape itself to create clippath from:
.box { clip-path: url("roundedrect.svg"); }
I have yet to discover a way to do it in Opera and Chrome.
But for FF and Safari "cross browser" example i have created this: http://tokimon.dk/testing/css-svg-test.html.
Otherwise maybe you can get something out of the background manipulation in CSS 3: http://www.css3.info/preview/
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