Andreas Kling ad37c8cd26 LibWeb: Treat :is(.foo) & :where(.foo) as class selectors when bucketing ...

These are just roundabout ways of writing .foo, so we can still put them
in the rules-by-class bucket and skip running them when the element
doesn't have that class.

Note that :is(.foo .bar) is also bucketed as a class rule, since the
context element must have the `bar` class for the selector to match.

This is a massive speedup on https://vercel.com/ as it cuts the number
of selectors we actually evaluate from 7.0% to 1.9%.

2024-09-09 12:46:55 +02:00

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