Re: [csswg-drafts] [filter-effects-1] Clarify equivalent markup for filter functions (#5704)

> (which can be questionable)

I'd like to add a `+1` to the questionability of that decision.
This thing bit me today, when I was investigating, why my `filter: grayscale(1);` produces such poor results.
After some digging, I learned about gamma correction, and ended up with something like this:
`filter: url('/gamma.svg#pre') grayscale(1) url('/gamma.svg#post');`
which finally looks normal.

Is there still a chance to fix those color filter functions?

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