There is no WebKit on Mobile
Peter-Paul Koch has done a series of tests against 19 different versions of WebKit, focusing on the various WebKit-based Mobile browsers currently shipping on a handful of different phones.
Whilst it's clear that from a JavaScript perspective, the differences between them are dramatic (and painful for any web developer to read), but it's a shame his test doesn't include much at all about the various WebKit's CSS handling. I suspect the differences are far more trivial and minimal for CSS, which means that at least from a design perspective, WebKit's increasing popularity is a good thing.
