Aliaksandr Kalenik 7cc973fa77 LibWeb: Lazify ElementByIdMap resolution and cache first element ...

Eliminate O(n) tree-order sorted insert on every add() by simply
appending elements and deferring order resolution to lookup time. Cache
the first-in-tree-order element in get() so repeated getElementById()
calls avoid repeated subtree traversal.

Improves performance on YouTube where add() was hot in profiles while
scrolling through comments.

2026-02-21 13:56:00 +01:00

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