It'd be nice if there was a machineable way to test UI in varying browsers. Litmus.com gets close, but it's only for emails, and "all" it does is render the ema

It'd be nice if there was a machineable way to test UI in varying browsers. Litmus.com gets close, but it's only for emails, and "all" it does is render the emails in like 40 different clients (which is actually amazing). But it'd be nice to be able to say, "Yes, this version in chrome is what I want it to look like," and you get back scores that determine how "close" the other versions are to the version you selected as your reference (0-100%?). Seems like one could achieve this with some sort of pixel diff algorithm.