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5c928eb7eb
`@scope (a) to (b) {}` applies its contained style rules to elements
that have `a` as a parent, and do not have `a b` as a parent. Both the
`a` and `b` selector lists are optional.
Because it's situational whether a `@scope` will apply to a given
element, we store the ancestor scope on the `MatchingRule`, similar to
`@container`, and then determine during matching whether all the parent
`@scope`s match or not.
The rules for how selectors inside `@scope` are adjusted and interpreted
are a bit confusing. Unlike for other at-rules, nested style rules
inside `@scope` do not get a leading `&` added during parsing. To
support this, `adapt_nested_relative_selector_list()` now takes a flag
for whether its parent is a `@scope` or not.
`@scope` can also contain nested declarations without itself being
nested inside a style rule.
When determining their selectors, nested declarations rules adopt the
`@scope`'s scoping root if it has one, or otherwise fall back to the
parent element of the `<style>` element (not implemented here,) or the
`:root`. These are required to have zero specificity, so we wrap the
selector in `:where()`.
37 lines
654 B
C++
37 lines
654 B
C++
/*
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* Copyright (c) 2025-2026, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/FlyString.h>
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#include <LibWeb/CSS/CSSRule.h>
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namespace Web::CSS::Parser {
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enum class RuleContext : u8 {
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Unknown,
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Style,
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AtContainer,
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AtCounterStyle,
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AtMedia,
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AtFontFace,
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AtFontFeatureValues,
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FontFeatureValue,
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AtFunction,
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AtKeyframes,
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Keyframe,
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AtSupports,
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AtScope,
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SupportsCondition,
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AtLayer,
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AtProperty,
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AtPage,
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Margin,
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};
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RuleContext rule_context_type_for_rule(CSSRule::Type);
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RuleContext rule_context_type_for_at_rule(FlyString const&);
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}
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