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LibWeb: Compute and propagate tree-counting function resolution context

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Tree counting functions should be resolved at style computation time -
to do this we will need to know the element's sibling count and index.

This commit computes that information and propagates it to the various
`StyleValue::to_computed_value` methods.
This commit is contained in:
Callum Law 2025-09-30 16:45:37 +13:00 • committed by Tim Ledbetter
commit 9cd23e3ae5
Notes: github-actions[bot] 2025-10-20 15:13:50 +00:00
9 changed files with 78 additions and 12 deletions
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6
Libraries/LibWeb/DOM/Element.cpp
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@ -844,8 +844,10 @@ CSS::RequiredInvalidationAfterStyleChange Element::recompute_inherited_style()
if (invalidation.is_none() && old_values_with_relative_units.is_empty())
return invalidation;
document().style_computer().compute_font(*computed_properties, AbstractElement { *this });
document().style_computer().compute_property_values(*computed_properties);
AbstractElement abstract_element { *this };
document().style_computer().compute_font(*computed_properties, abstract_element);
document().style_computer().compute_property_values(*computed_properties, abstract_element);
for (auto [property_id, old_value] : old_values_with_relative_units) {
auto const& new_value = computed_properties->property(static_cast<CSS::PropertyID>(property_id));