Why would passing AcidTest be all that interesting? I get HTML5 support, but it seems like passing a test where the weights are on more obscure features would be low on my priority list.
ACID3 is largely DOM and Javascript.Here's a good article to read about the ACID3 test, from a name you probably know: http://meyerweb.com/eric/thoughts/2008/03/27/acid-redux/