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.
--prefix to define var in Syntax.
namespacerulebeing unnecessarily limiting for authors. Some work arounds were discussed and feeling seemed to be a bit mixed. Conversation will continue on the mailing list.
subgridfrom level 1 of Grid. TabAtkins stated he agreed in principal with her arguments, but didn’t think shipping could be delayed long enough to get
subgridready. Due to lack of time the conversation will continue on the mailing list.