[Webkit-unassigned] [Bug 268481] Add `::first-line` UA stylesheet rules similar to `::placeholder`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=268481

--- Comment #3 from Ahmad Saleem <ahmad.saleem792 at gmail.com> ---
(In reply to Antti Koivisto from comment #2)
> That sort of rule on UA stylesheet would likely regress performance as we
> would need to compute ::first-line pseudo-element for every element. I think
> the correct approach is to prevent these properties from being applied in
> the C++ level (see PropertyAllowList.h/.cpp) for a possible strategy.

Thanks! I can try and see how far I progress. But never tried that part of area. :-)

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