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LibWeb: Don't rebuild rule cache so eagerly to check for :has/:defined

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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/
This commit is contained in:
Andreas Kling 2025-01-24 10:29:51 +01:00 • committed by Andreas Kling
commit 4bef0d0aea
Notes: github-actions[bot] 2025-01-24 16:55:43 +00:00
5 changed files with 13 additions and 12 deletions
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2
Libraries/LibWeb/DOM/Node.cpp
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@ -408,7 +408,7 @@ void Node::invalidate_style(StyleInvalidationReason reason)
// FIXME: This is very not optimal! We should figure out a smaller set of elements to invalidate,
// but right now the :has() selector means we have to invalidate everything.
if (!is_document() && document().style_computer().has_has_selectors()) {
if (!is_document() && document().style_computer().may_have_has_selectors()) {
document().invalidate_style(reason);
return;
}