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 and the SVG Working Group have published an updated Last Call Working Draft of CSS Masking Level 1. CSS Masking provides two means for partially or fully hiding portions of visual elements: masking and clipping.
Changes since the last Working Draft are listed in the Changes since last publication.
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