AFAIK even modern webkit browsers round up at the 1000th's place, so that's where I stop. I'm guessing those are value spit out by some sort of CSS calculator a

AFAIK even modern webkit browsers round up at the 1000th's place, so that's where I stop. I'm guessing those are value spit out by some sort of CSS calculator as part of a framework or similar. Having said all that, it's certainly "future proof."