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.
Discussed OM for
.conditionTexton the common interface; for
@mediait is equivalent to
.conditionTextreturns either the token stream or source text from the style rule, with no logical simplifications, just tokenization ones
CSS.supports()with one (
conditionText-compatible) or two (property, value) arguments. Fall back to
window.supportsCSS()if not possible.
:user-errorpseudo to represent
:-moz-ui-invalid. Issue raised about potential
!before the subject; issue open on whether before or after.
Tab presented his draft of CSS Syntax Level 3, which is defines CSS parsing as a state machine, and asked for feedback. Some work still necessary before it’s ready to publish officially as WD.