Do you want to know how the CSS WG works? Fantasai has written about:csswg, An Inside View of the CSS Working Group at W3C.
We’ve published a new official Working Draft of the CSS Backgrounds and Borders Module Level 3. Some major changes from the last draft include:
background-positionsyntax for positioning offsets from corners other than the top left
background-sizethat proportionally stretch the background image to either cover or be contained by the entire background area
Check it out and send us some feedback. This draft is in the stabilizing phase: the next publication should be the last one before Candidate Rec, and we’d rather get your comments this round. The plan is to do some more polish work, respond to comments and suggestions, and then publish a Last Call with this feature set near the end of the year.