Andreas Kling adc25af8e2 LibWeb: Make "assign slottables for a tree" fast when there are no slots ...

We achieve this by keeping track of the number of HTMLSlotElements
inside each ShadowRoot (do via ad-hoc insertion and removal steps.)

This allows slottables assignment to skip over entire shadow roots when
we know they have no slots anyway.

Massive speedup on https://wpt.fyi/ which no longer takes minutes/hours
to load, but instead a "mere" 19 seconds. :^)

2025-01-23 21:38:31 +01:00

5.7 KiB

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