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Implement CSSNestedDeclarations (#36248)

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This is the CSSOM interface that represents a nested declarations rule.
https://drafts.csswg.org/css-nesting/#the-cssnestrule

Testing: `/_mozilla/mozilla/interfaces.https.html`. And once
`CSSStyleRule` becomes a `CSSGroupingRule` subclass, this will be
further covered by `/css/css-nestting/`.
This is part of #36245

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2025-04-01 13:20:46 +02:00 • committed by GitHub
parent e8d5a019a4
commit bc6926d1fe
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7 changed files with 120 additions and 2 deletions
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10
components/script/dom/cssrule.rs
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@ -21,6 +21,7 @@ use crate::dom::csslayerblockrule::CSSLayerBlockRule;
use crate::dom::csslayerstatementrule::CSSLayerStatementRule;
use crate::dom::cssmediarule::CSSMediaRule;
use crate::dom::cssnamespacerule::CSSNamespaceRule;
use crate::dom::cssnesteddeclarations::CSSNestedDeclarations;
use crate::dom::cssstylerule::CSSStyleRule;
use crate::dom::cssstylesheet::CSSStyleSheet;
use crate::dom::csssupportsrule::CSSSupportsRule;
@ -69,6 +70,8 @@ impl CSSRule {
rule as &dyn SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSLayerStatementRule>() {
rule as &dyn SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSNestedDeclarations>() {
rule as &dyn SpecificCSSRule
} else {
unreachable!()
}
@ -125,7 +128,12 @@ impl CSSRule {
StyleCssRule::Scope(_) => unimplemented!(), // TODO
StyleCssRule::StartingStyle(_) => unimplemented!(), // TODO
StyleCssRule::PositionTry(_) => unimplemented!(), // TODO
StyleCssRule::NestedDeclarations(_) => unimplemented!(), // TODO
StyleCssRule::NestedDeclarations(s) => DomRoot::upcast(CSSNestedDeclarations::new(
window,
parent_stylesheet,
s,
can_gc,
)),
}
}