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.
On 6 September 2011, the CSSWG published an updated Working Draft of the CSS Values and Units Module Level 3. This module defines various new units as well as the
cycle() functional notations. With respect to the previous (2006!) draft, the
cycle() notation is new. Other than that, not much has changed substantially. However the draft received a very major editorial overhaul, and has now be sync’ed to CSS2.1.
As always, send feedback to www-style with the spec code
[css3-values] and your comment topic in the subject line. We’re especially asking for review on the functional notations, as their definitions are more complex than the other types.