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LibWeb/CSS: Reimplement var()/attr() as arbitrary substitution functions

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"Arbitrary substitution functions" are a family of functions that
includes var() and attr(). All of them resolve to an arbitrary set of
component values that are not known at parse-time, so they have to be
substituted at computed-value time.

Besides it being nice to follow the spec closely, this means we'll be
able to implement the others (such as `if()` and `inherit()`) more
easily.

The main omission here is the new "spread syntax", which can be
implemented in the future.
This commit is contained in:
Sam Atkins 2025-06-19 17:03:26 +01:00 • committed by Tim Ledbetter
parent b417d13a7b
commit b6032b0fcd
Notes: github-actions[bot] 2025-07-09 15:45:46 +00:00
11 changed files with 480 additions and 346 deletions
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2
Libraries/LibWeb/CSS/StyleComputer.h
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@ -193,7 +193,7 @@ public:
[[nodiscard]] inline bool should_reject_with_ancestor_filter(Selector const&) const;
static NonnullRefPtr<CSSStyleValue const> compute_value_of_custom_property(DOM::AbstractElement, FlyString const& custom_property);
static NonnullRefPtr<CSSStyleValue const> compute_value_of_custom_property(DOM::AbstractElement, FlyString const& custom_property, Optional<Parser::GuardedSubstitutionContexts&> = {});
private:
enum class ComputeStyleMode {