Sam Atkins 708f49d906 LibWeb: Give DOM Elements a CountersSet ...

This represents each element's set of CSS counters.
https://drafts.csswg.org/css-lists-3/#css-counters-set

Counters are resolved while building the tree. Most elements will not
have any counters to keep track of, so as an optimization, we don't
create a CountersSet object until the element actually needs one.

In order to properly support counters on pseudo-elements, the
CountersSet needs to go somewhere else. However, my experiments with
placing it on the Layout::Node kept hitting a wall. For now, this is
fairly simple at least.

2024-07-26 11:04:30 +01:00

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