Whenever I search for information on CSS or XHTML, Google usually returns something from the W3C (the WWW Consortium) in the first five results.

There are a zillion recommendation documents on the W3C website, so I’m never really sure which one I’m looking at.

Here are the ones that are working for me right now:

CSS 2.1 Specification:
http://www.w3.org/TR/CSS21/

XHTML 1.1 – Module-based XHTML
http://www.w3.org/TR/xhtml11/

XHTML 1.0 The Extensible HyperText Markup Language
http://www.w3.org/TR/xhtml1/

Anybody else have good XHTML/CSS references?