Andreas Kling 4bef0d0aea LibWeb: Don't rebuild rule cache so eagerly to check for :has/:defined ...

Instead, change the APIs from "has :foo" to "may have :foo" and return
true if we don't have a valid rule cache at the moment.

This allows us to defer the rebuilding of the rule cache until a later
time, for the cost of a wider invalidation at the moment.

Do note that if our rule cache is invalid, the whole document has
invalid style anyway! So this is actually always less work. :^)

Knocks ~1 second of loading time off of https://wpt.fyi/

2025-01-24 17:54:34 +01:00

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