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The CSS WG and the SVG WG decided to work on a CSS Masking specification in the FXTF. The CSS WG did not decide if the specification should specify the current behavior of browsers:
Further more the new specification unifies both implementations and extends 'clip-path' to take <shape>s from CSS Exclusions as shorthand for clipping beside <funcIRI>.
The CSS WG needs to decide if we continue with the current specification.
* Go on with ED * Keep 'mask-origin' * Drop 'mask-attachment' * 'mask-clip' must allow extending the region beyond border-box. * Keep 'clip-path' * Consider making 'clip' shadowing 'clip-path' (or the other way around), 'rect()' would just apply to absolute positioned elements for legacy reasons