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.
The CSS Working Group has published an updated Working Draft of Selectors Level 4. Selectors is a pattern-matching syntax for identifying sets of elements in a document, and is used e.g. for applying CSS declarations to elements in a document tree.
Additions include some new selectors:
:blank for elements that are empty or contain only white space, and :placeholder-shown for inputs that are showing a placeholder. Review and improved naming suggestions are particularly welcome on these—and also on the drag and drop pseudos.
Another important change is lifting restrictions on
:not() to accept complex selectors, and the definition of two profiles, one for CSS matching and another for less performance-intensive uses like
querySelector. We particularly encourage implementers to comment on whether this split is reasonable, or whether different things should be included/excluded.
The Working Draft includes a list of changes since the previous WD.
As always, please send feedback to the (archived) public mailing list email@example.com with the spec code (
[selectors]) and your comment topic in the subject line. (Alternatively, you can email one of the editors and ask them to forward your comment.)