[bane]

It should be but

http://en.wikipedia.org/wiki/Svg#Support_for_SVG_in_web_brow...

[petercooper]

http://caniuse.com/#search=svg is a more visual look at this.

Every major current and previous generation browser supports SVG images except IE 8. IE 8 users just wouldn't see the icons - a reasonably graceful degradation.