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LibWeb: Add support for the 'all' CSS property

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The "longhands" array is populated in the code generator to avoid the
overhead of manually maintaining the list in Properties.json

There is one subtest that still fails in
'cssstyledeclaration-csstext-all-shorthand', this is related to
us not maintaining the relative order of CSS declarations for custom vs
non-custom properties.
This commit is contained in:
Callum Law 2025-06-10 01:31:14 +12:00 • committed by Sam Atkins
commit d31a58a7d6
Notes: github-actions[bot] 2025-06-12 14:26:43 +00:00
16 changed files with 199 additions and 82 deletions
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5
Libraries/LibWeb/CSS/StyleValues/ShorthandStyleValue.cpp
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@ -95,6 +95,11 @@ String ShorthandStyleValue::to_string(SerializationMode mode) const
// Then special cases
switch (m_properties.shorthand_property) {
case PropertyID::All: {
// NOTE: 'all' can only be serialized in the case all sub-properties share the same CSS-wide keyword, this is
// handled above, thus, if we get to here that mustn't be the case and we should return the empty string.
return ""_string;
}
case PropertyID::Background: {
auto color = longhand(PropertyID::BackgroundColor);
auto image = longhand(PropertyID::BackgroundImage);