I’ve found that though sibling combinators are supported, and dynamic pseudo-classes are supported, the sky starts falling if you combine them. Am I marking something up wrong, or is browser support just spotty?
http://www.kerrickdesign.com/playground … lings.html I’ve written a simple page to demonstrate. View it in FF 3.5 or Opera 10 to see how it should work. View it in anything else to see sub-par behavior.