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LibWeb: Parse the will-change property

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This property provides a hint to the rendering engine about properties
that are likely to change in the near future, allowing for early
optimizations to be applied.
This commit is contained in:
Tim Ledbetter 2025-08-16 08:39:18 +01:00 • committed by Sam Atkins
commit 4f663ca6e7
Notes: github-actions[bot] 2025-08-18 11:37:59 +00:00
16 changed files with 335 additions and 2 deletions
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29
Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
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@ -797,6 +797,11 @@ Parser::ParseErrorOr<NonnullRefPtr<StyleValue const>> Parser::parse_css_value(Pr
if (auto parsed_value = parse_white_space_trim_value(tokens); parsed_value && !tokens.has_next_token())
return parsed_value.release_nonnull();
return ParseError::SyntaxError;
case PropertyID::WillChange:
if (auto parsed_value = parse_will_change_value(tokens); parsed_value && !tokens.has_next_token())
return parsed_value.release_nonnull();
return ParseError::SyntaxError;
default:
break;
}
@ -5692,4 +5697,28 @@ RefPtr<StyleValue const> Parser::parse_white_space_shorthand(TokenStream<Compone
return make_whitespace_shorthand(white_space_collapse, text_wrap_mode, white_space_trim);
}
// https://drafts.csswg.org/css-will-change/#will-change
RefPtr<StyleValue const> Parser::parse_will_change_value(TokenStream<ComponentValue>& tokens)
{
// auto | <animateable-feature>#
// <animateable-feature> = scroll-position | contents | <custom-ident>
if (parse_all_as_single_keyword_value(tokens, Keyword::Auto))
return KeywordStyleValue::create(Keyword::Auto);
auto parse_animateable_feature = [this](TokenStream<ComponentValue>& tokens) -> RefPtr<StyleValue const> {
auto style_value = parse_css_value_for_property(PropertyID::WillChange, tokens);
if (!style_value)
return nullptr;
if (style_value->to_keyword() == Keyword::Auto)
return nullptr;
return style_value;
};
return parse_comma_separated_value_list(tokens, [&parse_animateable_feature](auto& tokens) {
return parse_animateable_feature(tokens);
});
}
}