Sasha

Thanks @mattstyles, I've updated the post to accommodate @mattandersen's comment.

Hey Nathan, thanks. I always wondered about this, but not enough to actually look it up. Now I did, and appears you're absolutely right: "for zero lengths the unit identifier is optional" (http://www.w3.org/TR/2013/CR-css3-values-20130730/#lengths)

Nice Matt, that's cool as well! Thanks :)