Re: [fxtf-drafts] [css-compositing-2] Add plus-lighter to mix-blend-mode (#445)

Updating the proposal based on the discussion [here](https://github.com/w3c/fxtf-drafts/pull/444).

We'd like to introduce compositing operators in mix-blend-mode for developers to choose an operator other than the default source-over. mix-blend-mode can then be used to specify a blend mode or compositing operator and follows a pattern similar to globalCompositeOperation in canvas :

- If mix-blend-mode specifies a blend-mode, the compositing operator defaults to source-over. This is the current behaviour.
- If mix-blend-mode specifies a compositing operator, the blend mode defaults to normal. This is the change being proposed.

The use-case mentioned here is limited to exposing the "lighter" compositing operator. But we can allow specifying any compositing operator making mix-blend-mode consistent with the capabilities globalCompositeOperation provides for canvas.

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Received on Tuesday, 14 December 2021 16:49:20 UTC