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LibWeb/CSS: Add basic registered properties with initial values

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Add global registry for registered properties and partial support
for `@property` rule. Enables registering properties with initial
values. Also adds basic retrieval via `var()`.

Note: This is not a complete `@property` implementation.
This commit is contained in:
norbiros 2025-07-17 14:51:22 +02:00 • committed by Sam Atkins
commit 7ad01d28a8
Notes: github-actions[bot] 2025-07-18 10:13:56 +00:00
9 changed files with 73 additions and 20 deletions
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9
Libraries/LibWeb/DOM/Document.h
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@ -21,6 +21,7 @@
#include <LibURL/Origin.h>
#include <LibURL/URL.h>
#include <LibUnicode/Forward.h>
#include <LibWeb/CSS/CSSPropertyRule.h>
#include <LibWeb/CSS/CSSStyleSheet.h>
#include <LibWeb/CSS/StyleSheetList.h>
#include <LibWeb/Cookie/Cookie.h>
@ -905,6 +906,11 @@ public:
StyleInvalidator& style_invalidator() { return m_style_invalidator; }
// https://www.w3.org/TR/css-properties-values-api-1/#dom-window-registeredpropertyset-slot
HashMap<FlyString, GC::Ref<Web::CSS::CSSPropertyRule>>& registered_custom_properties();
NonnullRefPtr<CSS::CSSStyleValue const> custom_property_initial_value(FlyString const& name) const;
protected:
virtual void initialize(JS::Realm&) override;
virtual void visit_edges(Cell::Visitor&) override;
@ -1265,6 +1271,9 @@ private:
HashTable<WeakPtr<Node>> m_pending_nodes_for_style_invalidation_due_to_presence_of_has;
GC::Ref<StyleInvalidator> m_style_invalidator;
// https://www.w3.org/TR/css-properties-values-api-1/#dom-window-registeredpropertyset-slot
HashMap<FlyString, GC::Ref<Web::CSS::CSSPropertyRule>> m_registered_custom_properties;
};
template<>