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LibWeb: Implement the CSS revert keyword

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This is a universal value like `initial` and `inherit` and works by
reverting the current value to whatever we had at the start of the
current cascade origin.

The implementation is somewhat inefficient as we make a copy of all
current values at the start of each origin. I'm sure we can come up with
a way to make this faster eventually.
This commit is contained in:
Andreas Kling 2023-07-29 17:14:18 +02:00
parent 13d5d47b56
commit 8f29bdb62c
8 changed files with 257 additions and 187 deletions
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2
Userland/Libraries/LibWeb/CSS/StyleComputer.h
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@ -154,7 +154,7 @@ private:
bool expand_variables(DOM::Element&, Optional<CSS::Selector::PseudoElement>, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, Parser::TokenStream<Parser::ComponentValue>& source, Vector<Parser::ComponentValue>& dest) const;
bool expand_unresolved_values(DOM::Element&, StringView property_name, Parser::TokenStream<Parser::ComponentValue>& source, Vector<Parser::ComponentValue>& dest) const;
void set_all_properties(DOM::Element&, Optional<CSS::Selector::PseudoElement>, StyleProperties&, StyleValue const&, DOM::Document&, CSS::CSSStyleDeclaration const*) const;
void set_all_properties(DOM::Element&, Optional<CSS::Selector::PseudoElement>, StyleProperties&, StyleValue const&, DOM::Document&, CSS::CSSStyleDeclaration const*, StyleProperties::PropertyValues const& properties_for_revert) const;
template<typename Callback>
void for_each_stylesheet(CascadeOrigin, Callback) const;