[TheOtherHobbes]

Not wanting to be negative here, but I don't get the point of these CSS projects.

CSS isn't Turing complete. It's a (poorly designed) markup tool, not a general symbol processing language. So there's a whole world of stuff it just can't do in any useful way.

Any attempt to make it do this stuff is either going to have to fake it with limited sleight-of-mind, or is simply not going to work.

So "I made s Haskell compiler out of pure CSS" is always going to be disappointing. (If you could make real logic gates, you certainly could make a Haskell compiler. Although it's possible it wouldn't be fast enough for production code.)

[slaks]

I built this for fun, and to remind people that CSS can do more than you think. (it should also be a nice tool to help teach adders)

While I would obviously never do something this insane in a real product, I have used CSS for surprisingly much actual logic in real code (empty states for lists, hiding controls that the user cannot use, etc).

See also http://stackoverflow.com/a/5239256/34397