They had me at the heart but then the infinity blew my mind.
For the record it works in what's now the "old" Firefox 3.6 (Firefox 6 final is out in 4 days)
Everything made of triangles works in IE8 (ie. star and pentagon work).
Unfortunately IE6 does not support background:transparent but if you know what solid background color you do want, you can fake it.
If I remember correctly there is also a way to fake the transparency in IE6 with a chromakey and filter. You basically make the parts you want transparent a crazy color like bright pink and then have the filter make that color transparent. Almost not worth the effort anymore though.
For the record it works in what's now the "old" Firefox 3.6 (Firefox 6 final is out in 4 days)
Everything made of triangles works in IE8 (ie. star and pentagon work).
Unfortunately IE6 does not support background:transparent but if you know what solid background color you do want, you can fake it.
If I remember correctly there is also a way to fake the transparency in IE6 with a chromakey and filter. You basically make the parts you want transparent a crazy color like bright pink and then have the filter make that color transparent. Almost not worth the effort anymore though.