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LibWeb/CSS: Correct behavior of revert inside a @layer

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`revert` is supposed to revert to the previous cascade origin, but we
previously had it reverting to the previous layer. To support both,
track them separately during the cascade.

As part of this, we make `set_property_expanding_shorthands()` fall back
to `initial` if it can't find a previous value to revert to. Previously
we would just shrug and do nothing if that happened, which only works
if the value you want to revert to is whatever is currently in `style`.
That's no longer the case, because `revert` should skip over any layer
styles that have been applied since the previous origin.
This commit is contained in:
Sam Atkins 2024-09-25 14:22:50 +01:00 committed by Andreas Kling
parent a7a24fed68
commit bea47a2554
Notes: github-actions[bot] 2024-09-26 06:09:32 +00:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/LadybirdBrowser/ladybird/commit/bea47a25545
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1524
4 changed files with 88 additions and 30 deletions
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1
Tests/LibWeb/Text/expected/css/revert-ignores-layers.txt Normal file
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@ -0,0 +1 @@
PASS, revert skipped the layers

35
Tests/LibWeb/Text/input/css/revert-ignores-layers.html Normal file
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@ -0,0 +1,35 @@
<!DOCTYPE html>
<style>
@layer A, B, C;
@layer A {
#target {
color: red;
}
}
@layer B {
#target {
color: blue;
}
}
@layer C {
#target {
color: revert;
}
}
</style>
<script src="../include.js"></script>
<div id="target"></div>
<div id="initial"></div>
<script>
test(() => {
const target = document.getElementById("target");
const initial = document.getElementById("target");
const expected = getComputedStyle(initial).color;
const actual = getComputedStyle(target).color;
if (expected === actual) {
println('PASS, revert skipped the layers');
} else {
println(`FAIL: got ${actual}, expected ${expected}`);
}
});
</script>

76
Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
View file

@ -896,18 +896,25 @@ void StyleComputer::for_each_property_expanding_shorthands(PropertyID property_i
set_longhand_property(property_id, value);
}
void StyleComputer::set_property_expanding_shorthands(StyleProperties& style, CSS::PropertyID property_id, CSSStyleValue const& value, CSS::CSSStyleDeclaration const* declaration, StyleProperties const& style_for_revert, Important important)
void StyleComputer::set_property_expanding_shorthands(StyleProperties& style, PropertyID property_id, CSSStyleValue const& value, CSSStyleDeclaration const* declaration, StyleProperties const& style_for_revert, StyleProperties const& style_for_revert_layer, Important important)
{
auto revert_shorthand = [&](PropertyID shorthand_id, StyleProperties const& style_for_revert) {
auto previous_value = style_for_revert.m_data->m_property_values[to_underlying(shorthand_id)];
if (!previous_value)
previous_value = CSSKeywordValue::create(Keyword::Initial);
style.set_property(shorthand_id, *previous_value, StyleProperties::Inherited::No, important);
if (shorthand_id == CSS::PropertyID::AnimationName)
style.set_animation_name_source(style_for_revert.animation_name_source());
if (shorthand_id == CSS::PropertyID::TransitionProperty)
style.set_transition_property_source(style_for_revert.transition_property_source());
};
for_each_property_expanding_shorthands(property_id, value, AllowUnresolved::No, [&](PropertyID shorthand_id, CSSStyleValue const& shorthand_value) {
if (shorthand_value.is_revert() || shorthand_value.is_revert_layer()) {
auto const& property_in_previous_cascade_origin = style_for_revert.m_data->m_property_values[to_underlying(shorthand_id)];
if (property_in_previous_cascade_origin) {
style.set_property(shorthand_id, *property_in_previous_cascade_origin, StyleProperties::Inherited::No, important);
if (shorthand_id == CSS::PropertyID::AnimationName)
style.set_animation_name_source(style_for_revert.animation_name_source());
if (shorthand_id == CSS::PropertyID::TransitionProperty)
style.set_transition_property_source(style_for_revert.transition_property_source());
}
if (shorthand_value.is_revert()) {
revert_shorthand(shorthand_id, style_for_revert);
} else if (shorthand_value.is_revert_layer()) {
revert_shorthand(shorthand_id, style_for_revert_layer);
} else {
style.set_property(shorthand_id, shorthand_value, StyleProperties::Inherited::No, important);
if (shorthand_id == CSS::PropertyID::AnimationName)
@ -918,16 +925,21 @@ void StyleComputer::set_property_expanding_shorthands(StyleProperties& style, CS
});
}
void StyleComputer::set_all_properties(DOM::Element& element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, StyleProperties& style, CSSStyleValue const& value, DOM::Document& document, CSS::CSSStyleDeclaration const* declaration, StyleProperties const& style_for_revert, Important important) const
void StyleComputer::set_all_properties(DOM::Element& element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, StyleProperties& style, CSSStyleValue const& value, DOM::Document& document, CSS::CSSStyleDeclaration const* declaration, StyleProperties const& style_for_revert, StyleProperties const& style_for_revert_layer, Important important) const
{
for (auto i = to_underlying(CSS::first_longhand_property_id); i <= to_underlying(CSS::last_longhand_property_id); ++i) {
auto property_id = (CSS::PropertyID)i;
if (value.is_revert() || value.is_revert_layer()) {
if (value.is_revert()) {
style.revert_property(property_id, style_for_revert);
continue;
}
if (value.is_revert_layer()) {
style.revert_property(property_id, style_for_revert_layer);
continue;
}
if (value.is_unset()) {
if (is_inherited_property(property_id)) {
style.set_property(
@ -949,25 +961,23 @@ void StyleComputer::set_all_properties(DOM::Element& element, Optional<CSS::Sele
if (property_value->is_unresolved())
property_value = Parser::Parser::resolve_unresolved_style_value(Parser::ParsingContext { document }, element, pseudo_element, property_id, property_value->as_unresolved());
if (!property_value->is_unresolved())
set_property_expanding_shorthands(style, property_id, property_value, declaration, style_for_revert);
set_property_expanding_shorthands(style, property_id, property_value, declaration, style_for_revert, style_for_revert_layer);
style.set_property_important(property_id, important);
set_property_expanding_shorthands(style, property_id, value, declaration, style_for_revert, important);
set_property_expanding_shorthands(style, property_id, value, declaration, style_for_revert, style_for_revert_layer, important);
}
}
void StyleComputer::cascade_declarations(StyleProperties& style, DOM::Element& element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, Vector<MatchingRule> const& matching_rules, CascadeOrigin cascade_origin, Important important) const
void StyleComputer::cascade_declarations(StyleProperties& style, DOM::Element& element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, Vector<MatchingRule> const& matching_rules, CascadeOrigin cascade_origin, Important important, StyleProperties const& style_for_revert, StyleProperties const& style_for_revert_layer) const
{
auto style_for_revert = style.clone();
for (auto const& match : matching_rules) {
for (auto const& property : match.rule->declaration().properties()) {
if (important != property.important)
continue;
if (property.property_id == CSS::PropertyID::All) {
set_all_properties(element, pseudo_element, style, property.value, m_document, &match.rule->declaration(), style_for_revert, important);
set_all_properties(element, pseudo_element, style, property.value, m_document, &match.rule->declaration(), style_for_revert, style_for_revert_layer, important);
continue;
}
@ -975,7 +985,7 @@ void StyleComputer::cascade_declarations(StyleProperties& style, DOM::Element& e
if (property.value->is_unresolved())
property_value = Parser::Parser::resolve_unresolved_style_value(Parser::ParsingContext { document() }, element, pseudo_element, property.property_id, property.value->as_unresolved());
if (!property_value->is_unresolved())
set_property_expanding_shorthands(style, property.property_id, property_value, &match.rule->declaration(), style_for_revert, important);
set_property_expanding_shorthands(style, property.property_id, property_value, &match.rule->declaration(), style_for_revert, style_for_revert_layer, important);
}
}
@ -986,7 +996,7 @@ void StyleComputer::cascade_declarations(StyleProperties& style, DOM::Element& e
continue;
if (property.property_id == CSS::PropertyID::All) {
set_all_properties(element, pseudo_element, style, property.value, m_document, inline_style, style_for_revert, important);
set_all_properties(element, pseudo_element, style, property.value, m_document, inline_style, style_for_revert, style_for_revert_layer, important);
continue;
}
@ -994,7 +1004,7 @@ void StyleComputer::cascade_declarations(StyleProperties& style, DOM::Element& e
if (property.value->is_unresolved())
property_value = Parser::Parser::resolve_unresolved_style_value(Parser::ParsingContext { document() }, element, pseudo_element, property.property_id, property.value->as_unresolved());
if (!property_value->is_unresolved())
set_property_expanding_shorthands(style, property.property_id, property_value, inline_style, style_for_revert, important);
set_property_expanding_shorthands(style, property.property_id, property_value, inline_style, style_for_revert, style_for_revert_layer, important);
}
}
}
@ -1532,12 +1542,17 @@ void StyleComputer::compute_cascaded_values(StyleProperties& style, DOM::Element
// Then we apply the declarations from the matched rules in cascade order:
// Normal user agent declarations
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_agent_rules, CascadeOrigin::UserAgent, Important::No);
auto previous_origin_style = style.clone();
auto previous_layer_style = style.clone();
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_agent_rules, CascadeOrigin::UserAgent, Important::No, previous_origin_style, previous_layer_style);
// Normal user declarations
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_rules, CascadeOrigin::User, Important::No);
previous_origin_style = style.clone();
previous_layer_style = style.clone();
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_rules, CascadeOrigin::User, Important::No, previous_origin_style, previous_layer_style);
// Author presentational hints (NOTE: The spec doesn't say exactly how to prioritize these.)
previous_origin_style = style.clone();
if (!pseudo_element.has_value()) {
element.apply_presentational_hints(style);
@ -1560,7 +1575,8 @@ void StyleComputer::compute_cascaded_values(StyleProperties& style, DOM::Element
// Normal author declarations, ordered by @layer, with un-@layer-ed rules last
for (auto const& layer : matching_rule_set.author_rules) {
cascade_declarations(style, element, pseudo_element, layer.rules, CascadeOrigin::Author, Important::No);
previous_layer_style = style.clone();
cascade_declarations(style, element, pseudo_element, layer.rules, CascadeOrigin::Author, Important::No, previous_origin_style, previous_layer_style);
}
// Animation declarations [css-animations-2]
@ -1626,15 +1642,21 @@ void StyleComputer::compute_cascaded_values(StyleProperties& style, DOM::Element
}
// Important author declarations, with un-@layer-ed rules first, followed by each @layer in reverse order.
previous_origin_style = style.clone();
for (auto const& layer : matching_rule_set.author_rules.in_reverse()) {
cascade_declarations(style, element, pseudo_element, layer.rules, CascadeOrigin::Author, Important::Yes);
previous_layer_style = style.clone();
cascade_declarations(style, element, pseudo_element, layer.rules, CascadeOrigin::Author, Important::Yes, previous_origin_style, previous_layer_style);
}
// Important user declarations
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_rules, CascadeOrigin::User, Important::Yes);
previous_origin_style = style.clone();
previous_layer_style = style.clone();
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_rules, CascadeOrigin::User, Important::Yes, previous_origin_style, previous_layer_style);
// Important user agent declarations
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_agent_rules, CascadeOrigin::UserAgent, Important::Yes);
previous_origin_style = style.clone();
previous_layer_style = style.clone();
cascade_declarations(style, element, pseudo_element, matching_rule_set.user_agent_rules, CascadeOrigin::UserAgent, Important::Yes, previous_origin_style, previous_layer_style);
// Transition declarations [css-transitions-1]
// Note that we have to do these after finishing computing the style,

6
Userland/Libraries/LibWeb/CSS/StyleComputer.h
View file

@ -114,7 +114,7 @@ public:
No,
};
static void for_each_property_expanding_shorthands(PropertyID, CSSStyleValue const&, AllowUnresolved, Function<void(PropertyID, CSSStyleValue const&)> const& set_longhand_property);
static void set_property_expanding_shorthands(StyleProperties&, PropertyID, CSSStyleValue const&, CSS::CSSStyleDeclaration const*, StyleProperties const& style_for_revert, Important = Important::No);
static void set_property_expanding_shorthands(StyleProperties&, PropertyID, CSSStyleValue const&, CSS::CSSStyleDeclaration const*, StyleProperties const& style_for_revert, StyleProperties const& style_for_revert_layer, Important = Important::No);
static NonnullRefPtr<CSSStyleValue const> get_inherit_value(JS::Realm& initial_value_context_realm, CSS::PropertyID, DOM::Element const*, Optional<CSS::Selector::PseudoElement::Type> = {});
static Optional<String> user_agent_style_sheet_source(StringView name);
@ -184,7 +184,7 @@ private:
void compute_defaulted_property_value(StyleProperties&, DOM::Element const*, CSS::PropertyID, Optional<CSS::Selector::PseudoElement::Type>) const;
void set_all_properties(DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, StyleProperties&, CSSStyleValue const&, DOM::Document&, CSS::CSSStyleDeclaration const*, StyleProperties const& style_for_revert, Important = Important::No) const;
void set_all_properties(DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, StyleProperties&, CSSStyleValue const&, DOM::Document&, CSS::CSSStyleDeclaration const*, StyleProperties const& style_for_revert, StyleProperties const& style_for_revert_layer, Important = Important::No) const;
template<typename Callback>
void for_each_stylesheet(CascadeOrigin, Callback) const;
@ -207,7 +207,7 @@ private:
Vector<LayerMatchingRules> author_rules;
};
void cascade_declarations(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, Vector<MatchingRule> const&, CascadeOrigin, Important) const;
void cascade_declarations(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, Vector<MatchingRule> const&, CascadeOrigin, Important, StyleProperties const& style_for_revert, StyleProperties const& style_for_revert_layer) const;
void build_rule_cache();
void build_rule_cache_if_needed() const;