The website <http://css3test.com/> tests browsers for the existence of CSS3 features and can be used to gauge the progress of features. I'd like to see WebKit hit 100% before the other engines do. Note that this site only currently checks for the existence of features, not that they are correct.
* Safari 5.0.6 on 10.5.8 PPC: 57%, determined by passing 386 tests out of 783 total for 187 features.
I think it's more useful to focus on the missing properties one at a time.
(In reply to comment #1)
> I think it's more useful to focus on the missing properties one at a time.
Then create a bug for the missing feature! :)
Please do file bugs on individual properties or failures, and link them back to this bug via the "Blocks" field. Please don't expect others to necessarily contribute to this :) If there are no bugs that this bug depends on in a couple of weeks I'll be inclined to close it due to lack of interest.
Interesting. I enjoyed working on html5test... but have been sad that the author hasn't responded to any of my email/bug feedback on the tests. Perhaps I'll look at this one after I finish <iframe seamless>.