Fun With CSS-only Bubbles, Sans JS

I just couldn’t help but try to figure out a way to do those hover tooltip bubbles without Javascript, so I came up with a way.  This is one is pure CSS3 transforms and transitions, triggered by a selected nested within a hover, which is a bit of a strange construct, but works, at least in Safari 5 (haven’t tested other browsers yet).  It does have some caveats in its current form, but give it a try.