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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
parent e7f0126c2e
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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16
Libraries/LibWeb/CSS/StyleComputer.cpp
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@ -3106,33 +3106,25 @@ void StyleComputer::unload_fonts_from_sheet(CSSStyleSheet& sheet)
}
}
static NonnullRefPtr<CSSStyleValue const> custom_property_initial_value(FlyString const& name)
{
// FIXME: Look-up initial value for registered properties. (@property)
(void)name;
// For non-registered properties, the initial value is the guaranteed-invalid value.
return GuaranteedInvalidStyleValue::create();
}
NonnullRefPtr<CSSStyleValue const> StyleComputer::compute_value_of_custom_property(DOM::AbstractElement abstract_element, FlyString const& name, Optional<Parser::GuardedSubstitutionContexts&> guarded_contexts)
{
// https://drafts.csswg.org/css-variables/#propdef-
// The computed value of a custom property is its specified value with any arbitrary-substitution functions replaced.
// FIXME: These should probably be part of ComputedProperties.
auto& document = abstract_element.document();
auto value = abstract_element.get_custom_property(name);
if (!value || value->is_initial())
return custom_property_initial_value(name);
return document.custom_property_initial_value(name);
// Unset is the same as inherit for inherited properties, and by default all custom properties are inherited.
// FIXME: Support non-inherited registered custom properties.
if (value->is_inherit() || value->is_unset()) {
if (!abstract_element.parent_element())
return custom_property_initial_value(name);
return document.custom_property_initial_value(name);
auto inherited_value = DOM::AbstractElement { const_cast<DOM::Element&>(*abstract_element.parent_element()) }.get_custom_property(name);
if (!inherited_value)
return custom_property_initial_value(name);
return document.custom_property_initial_value(name);
return inherited_value.release_nonnull();
}