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LibWeb/CSS: Implement import at-rule supports conditions

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This indicates the features the browser must support for the given
stylesheet to be fetched.
This commit is contained in:
Tim Ledbetter 2025-03-19 11:23:33 +00:00 • committed by Jelle Raaijmakers
commit c37a47f76f
Notes: github-actions[bot] 2025-03-19 15:43:58 +00:00
7 changed files with 95 additions and 9 deletions
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17
Libraries/LibWeb/CSS/CSSImportRule.cpp
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@ -23,16 +23,17 @@ namespace Web::CSS {
GC_DEFINE_ALLOCATOR(CSSImportRule);
GC::Ref<CSSImportRule> CSSImportRule::create(URL::URL url, DOM::Document& document)
GC::Ref<CSSImportRule> CSSImportRule::create(URL::URL url, DOM::Document& document, RefPtr<Supports> supports)
{
auto& realm = document.realm();
return realm.create<CSSImportRule>(move(url), document);
return realm.create<CSSImportRule>(move(url), document, supports);
}
CSSImportRule::CSSImportRule(URL::URL url, DOM::Document& document)
CSSImportRule::CSSImportRule(URL::URL url, DOM::Document& document, RefPtr<Supports> supports)
: CSSRule(document.realm(), Type::Import)
, m_url(move(url))
, m_document(document)
, m_supports(supports)
{
}
@ -70,6 +71,11 @@ String CSSImportRule::serialized() const
// 2. The result of performing serialize a URL on the rule’s location.
serialize_a_url(builder, m_url.to_string());
// AD-HOC: Serialize the rule's supports condition if it exists.
// This isn't currently specified, but major browsers include this in their serialization of import rules
if (m_supports)
builder.appendff(" supports({})", m_supports->to_string());
// FIXME: 3. If the rule’s associated media list is not empty, a single SPACE (U+0020) followed by the result of performing serialize a media query list on the media list.
// 4. The string ";", i.e., SEMICOLON (U+003B).
@ -88,7 +94,10 @@ void CSSImportRule::fetch()
VERIFY(parent_style_sheet());
auto& parent_style_sheet = *this->parent_style_sheet();
// FIXME: 2. If rule has a <supports-condition>, and that condition is not true, return.
// 2. If rule has a <supports-condition>, and that condition is not true, return.
if (m_supports && !m_supports->matches()) {
return;
}
// 3. Let parsedUrl be the result of the URL parser steps with rule’s URL and parentStylesheet’s location.
// If the algorithm returns an error, return. [CSSOM]