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LibWeb: Produce correct resolved value for animation-duration

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Callum Law 2025-11-23 02:45:19 +13:00 • committed by Sam Atkins
parent c8d91c127e
commit 8a197b7ee5
Notes: github-actions[bot] 2025-11-28 13:25:19 +00:00
2 changed files with 37 additions and 4 deletions
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33
Libraries/LibWeb/CSS/CSSStyleProperties.cpp
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@ -21,6 +21,7 @@
#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
#include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
#include <LibWeb/CSS/StyleValues/StyleValueList.h>
#include <LibWeb/CSS/StyleValues/TimeStyleValue.h>
#include <LibWeb/CSS/StyleValues/TransformationStyleValue.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Element.h>
@ -870,6 +871,38 @@ RefPtr<StyleValue const> CSSStyleProperties::style_value_for_computed_property(L
return TransformationStyleValue::create(PropertyID::Transform, TransformFunction::Matrix3d, move(parameters));
}
}
case PropertyID::AnimationDuration: {
// https://drafts.csswg.org/css-animations-2/#animation-duration
// For backwards-compatibility with Level 1, when the computed value of animation-timeline is auto (i.e. only
// one list value, and that value being auto), the resolved value of auto for animation-duration is 0s whenever
// its used value would also be 0s.
auto const& animation_timeline_computed_value = get_computed_value(PropertyID::AnimationTimeline);
auto const& animation_duration_computed_value = get_computed_value(PropertyID::AnimationDuration);
if (animation_timeline_computed_value.to_keyword() == Keyword::Auto) {
// FIXME: We can remove these two branches once parse_comma_separated_value_list always returns StyleValueList.
if (animation_duration_computed_value.to_keyword() == Keyword::Auto)
return TimeStyleValue::create(Time::make_seconds(0));
if (!animation_duration_computed_value.is_value_list())
return animation_duration_computed_value;
StyleValueVector resolved_durations;
for (auto const& duration : animation_duration_computed_value.as_value_list().values()) {
if (duration->to_keyword() == Keyword::Auto) {
resolved_durations.append(TimeStyleValue::create(Time::make_seconds(0)));
} else {
resolved_durations.append(duration);
}
}
return StyleValueList::create(move(resolved_durations), StyleValueList::Separator::Comma);
}
return animation_duration_computed_value;
}
// -> Any other property
// The resolved value is the computed value.