Topic: W3C doesn't understand its own standards
So this is partially related to ruby. A different Ruby. Mostly XHTML and CSS. Anyhow, check out http://www.w3.org/TR/ruby . Click the text. Yeah. It turns red, if you're using a standards-compliant browser.
The W3C used ":active" in an attempt to style links, no doubt developing on <=IE6, where :active applies (almost?) exclusively to "a" elements.
I got a kick out of this and figured I'd share