Andreas Kling caad205467 LibWeb: Share singleton constructed stylesheet rule caches ...

Share the style cache for shadow roots whose only active author sheet is
the same constructed stylesheet. Matching already carries the effective
shadow root separately, so the cache can be reused while selectors such
as :host and ::slotted() still evaluate against each consuming shadow
root.

Keep the optimization conservative by falling back to the existing
per-scope cache whenever the shadow root has multiple active sheets, a
non-constructed sheet, or a page user stylesheet. Drop the shared cache
when the stylesheet rules or media query match state change.

Add coverage for two shadow roots adopting the same constructed sheet,
including :host, ::slotted(), and replaceSync() invalidation.

2026-04-28 13:07:52 +02:00

6.7 KiB

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