Andreas Kling d22228ab93 LibWeb: Bail early from doomed pseudo-element style computation ...

Once we know the final value of the `content` property for a
pseudo-element, we can bail early if the value is `none` or `normal`
(note that `normal` only applies to ::before and ::after).

In those cases, no pseudo-element will be generated, so everything
that follows in StyleComputer would be wasted work.

This noticeably improves performance on many pages, such as
https://tailwindcss.com/ where style updates go from 360ms -> 250ms.

2024-09-10 15:19:55 +02:00

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