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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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22
Libraries/LibWeb/DOM/Document.cpp
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@ -46,6 +46,7 @@
#include <LibWeb/CSS/StyleComputer.h>
#include <LibWeb/CSS/StyleSheetIdentifier.h>
#include <LibWeb/CSS/StyleValues/ColorSchemeStyleValue.h>
#include <LibWeb/CSS/StyleValues/GuaranteedInvalidStyleValue.h>
#include <LibWeb/CSS/SystemColor.h>
#include <LibWeb/CSS/TransitionEvent.h>
#include <LibWeb/CSS/VisualViewport.h>
@ -620,6 +621,7 @@ void Document::visit_edges(Cell::Visitor& visitor)
visitor.visit(m_render_blocking_elements);
visitor.visit(m_policy_container);
visitor.visit(m_style_invalidator);
visitor.visit(m_registered_custom_properties);
}
// https://w3c.github.io/selection-api/#dom-document-getselection
@ -6576,6 +6578,26 @@ String Document::dump_display_list()
return display_list->dump();
}
HashMap<FlyString, GC::Ref<Web::CSS::CSSPropertyRule>>& Document::registered_custom_properties()
{
return m_registered_custom_properties;
}
NonnullRefPtr<CSS::CSSStyleValue const> Document::custom_property_initial_value(FlyString const& name) const
{
auto maybe_custom_property = m_registered_custom_properties.get(name);
if (maybe_custom_property.has_value()) {
auto parsed_value = maybe_custom_property.value()->initial_style_value();
if (!parsed_value)
return CSS::GuaranteedInvalidStyleValue::create();
return parsed_value.release_nonnull();
}
// For non-registered properties, the initial value is the guaranteed-invalid value.
// See: https://drafts.csswg.org/css-variables/#propdef-
return CSS::GuaranteedInvalidStyleValue::create();
}
GC::Ptr<Element> ElementByIdMap::get(FlyString const& element_id) const
{
if (auto elements = m_map.get(element_id); elements.has_value() && !elements->is_empty()) {