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 Filter Effects.
Filter Effects allow applying filter operations like blur or color matrix on any graphical element.
The current version integrates
Changes since the last Working Draft are listed in the Changes section.
Please send feedback to the (archived) public mailing list firstname.lastname@example.org with the spec code (
[filter-effects]) and your comment topic in the subject line. (Alternatively, you can email one of the editors and ask them to forward your comment.)