LibWeb/CSS: Implement the color-scheme CSS property

Author: https://github.com/Gingeh
Commit: https://github.com/LadybirdBrowser/ladybird/commit/ce5cd012b99
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3146
Reviewed-by: https://github.com/AtkinsSJ ✅

Base/res/ladybird/inspector.css

@@ -4,7 +4,6 @@
 
 @media (prefers-color-scheme: dark) {
     :root {
-        --background: rgb(23, 23, 23);
         --separator: dimgray;
         --separator-accent: rgb(57, 57, 57);
         --tab-controls: rgb(57, 57, 57);
@@ -30,7 +29,6 @@
 
 @media (prefers-color-scheme: light) {
     :root {
-        --background: white;
         --separator: lightgray;
         --separator-accent: white;
         --tab-controls: rgb(229, 229, 229);
@@ -54,7 +52,7 @@
 }
 
 html {
-    background-color: var(--background);
+    color-scheme: light dark;
 }
 
 body {
@@ -186,7 +184,7 @@ body {
     left: 0;
     right: 0;
     background-color: var(--tab-controls);
-    border-top: 2px solid var(--background);
+    border-top: 2px solid Canvas;
     display: flex;
     padding: 0.5em;
 }

Base/res/ladybird/newtab.html

@@ -4,11 +4,8 @@
     <meta charset="UTF-8">
     <title>New Tab</title>
     <style>
-        /* FIXME: We should be able to remove the HTML style when "color-scheme" is supported */
-        @media (prefers-color-scheme: dark) {
         html {
-                background-color: rgb(20, 20, 20);
-            }
+            color-scheme: light dark;
         }
     </style>
 </head>

Base/res/ladybird/templates/directory.html

@@ -4,15 +4,8 @@
     <meta charset="UTF-8">
     <title>Index of %path%</title>
     <style>
-        /* FIXME: We should be able to remove the HTML style when "color-scheme" is supported */
-        @media (prefers-color-scheme: dark) {
         html {
-                background-color: rgb(20, 20, 20);
-                color: rgb(235, 235, 235);
-            }
-            a {
-                color: cornflowerblue;
-            }
+            color-scheme: light dark;
         }
 
         header {

Base/res/ladybird/templates/error.html

@@ -4,12 +4,8 @@
     <meta charset="UTF-8">
     <title>Error!</title>
     <style>
-        /* FIXME: We should be able to remove the HTML style when "color-scheme" is supported */
-        @media (prefers-color-scheme: dark) {
         html {
-                background-color: rgb(20, 20, 20);
-                color: rgb(235, 235, 235);
-            }
+            color-scheme: light dark;
         }
 
         h1 {

Base/res/ladybird/templates/version.html

@@ -4,12 +4,8 @@
     <meta charset="UTF-8">
     <title>About %browser_name%</title>
     <style>
-        /* FIXME: We should be able to remove the HTML style when "color-scheme" is supported */
-        @media (prefers-color-scheme: dark) {
         html {
-                background-color: rgb(20, 20, 20);
-                color: rgb(235, 235, 235);
-            }
+            color-scheme: light dark;
         }
         img {
             float: left;

Libraries/LibWeb/CMakeLists.txt

@@ -126,6 +126,7 @@ set(SOURCES
     CSS/StyleValues/BasicShapeStyleValue.cpp
     CSS/StyleValues/BorderRadiusStyleValue.cpp
     CSS/StyleValues/CalculatedStyleValue.cpp
+    CSS/StyleValues/ColorSchemeStyleValue.cpp
     CSS/StyleValues/ConicGradientStyleValue.cpp
     CSS/StyleValues/ContentStyleValue.cpp
     CSS/StyleValues/CounterDefinitionsStyleValue.cpp

Libraries/LibWeb/CSS/CSSStyleValue.cpp

@@ -19,6 +19,7 @@
 #include <LibWeb/CSS/StyleValues/CSSColorValue.h>
 #include <LibWeb/CSS/StyleValues/CSSKeywordValue.h>
 #include <LibWeb/CSS/StyleValues/CalculatedStyleValue.h>
+#include <LibWeb/CSS/StyleValues/ColorSchemeStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ConicGradientStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ContentStyleValue.h>
 #include <LibWeb/CSS/StyleValues/CounterDefinitionsStyleValue.h>
@@ -116,6 +117,12 @@ CSSColorValue const& CSSStyleValue::as_color() const
     return static_cast<CSSColorValue const&>(*this);
 }
 
+ColorSchemeStyleValue const& CSSStyleValue::as_color_scheme() const
+{
+    VERIFY(is_color_scheme());
+    return static_cast<ColorSchemeStyleValue const&>(*this);
+}
+
 ConicGradientStyleValue const& CSSStyleValue::as_conic_gradient() const
 {
     VERIFY(is_conic_gradient());

Libraries/LibWeb/CSS/CSSStyleValue.h

@@ -96,6 +96,7 @@ public:
         BorderRadius,
         Calculated,
         Color,
+        ColorScheme,
         ConicGradient,
         Content,
         Counter,
@@ -178,6 +179,10 @@ public:
     CSSColorValue const& as_color() const;
     CSSColorValue& as_color() { return const_cast<CSSColorValue&>(const_cast<CSSStyleValue const&>(*this).as_color()); }
 
+    bool is_color_scheme() const { return type() == Type::ColorScheme; }
+    ColorSchemeStyleValue const& as_color_scheme() const;
+    ColorSchemeStyleValue& as_color_scheme() { return const_cast<ColorSchemeStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_color_scheme()); }
+
     bool is_conic_gradient() const { return type() == Type::ConicGradient; }
     ConicGradientStyleValue const& as_conic_gradient() const;
     ConicGradientStyleValue& as_conic_gradient() { return const_cast<ConicGradientStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_conic_gradient()); }

Libraries/LibWeb/CSS/ComputedProperties.cpp

@@ -13,6 +13,7 @@
 #include <LibWeb/CSS/ComputedProperties.h>
 #include <LibWeb/CSS/StyleValues/AngleStyleValue.h>
 #include <LibWeb/CSS/StyleValues/CSSKeywordValue.h>
+#include <LibWeb/CSS/StyleValues/ColorSchemeStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ContentStyleValue.h>
 #include <LibWeb/CSS/StyleValues/CounterDefinitionsStyleValue.h>
 #include <LibWeb/CSS/StyleValues/CounterStyleValue.h>
@@ -228,6 +229,34 @@ Color ComputedProperties::color_or_fallback(CSS::PropertyID id, Layout::NodeWith
     return value.to_color(node);
 }
 
+// https://drafts.csswg.org/css-color-adjust-1/#determine-the-used-color-scheme
+CSS::PreferredColorScheme ComputedProperties::color_scheme(CSS::PreferredColorScheme preferred_scheme) const
+{
+    // To determine the used color scheme of an element:
+    auto const& scheme_value = property(CSS::PropertyID::ColorScheme).as_color_scheme();
+
+    // 1. If the user’s preferred color scheme, as indicated by the prefers-color-scheme media feature,
+    //    is present among the listed color schemes, and is supported by the user agent,
+    //    that’s the element’s used color scheme.
+    if (preferred_scheme != CSS::PreferredColorScheme::Auto && scheme_value.schemes().contains_slow(preferred_color_scheme_to_string(preferred_scheme)))
+        return preferred_scheme;
+
+    // 2. Otherwise, if the user has indicated an overriding preference for their chosen color scheme,
+    //    and the only keyword is not present in color-scheme for the element,
+    //    the user agent must override the color scheme with the user’s preferred color scheme.
+    //    See § 2.3 Overriding the Color Scheme.
+    // FIXME: We don't currently support setting an "overriding preference" for color schemes.
+
+    // 3. Otherwise, if the user agent supports at least one of the listed color schemes,
+    //    the used color scheme is the first supported color scheme in the list.
+    auto first_supported = scheme_value.schemes().first_matching([](auto scheme) { return preferred_color_scheme_from_string(scheme) != CSS::PreferredColorScheme::Auto; });
+    if (first_supported.has_value())
+        return preferred_color_scheme_from_string(first_supported.value());
+
+    // 4. Otherwise, the used color scheme is the browser default. (Same as normal.)
+    return CSS::PreferredColorScheme::Light;
+}
+
 NonnullRefPtr<Gfx::Font const> ComputedProperties::font_fallback(bool monospace, bool bold, float point_size)
 {
     if (monospace && bold)

Libraries/LibWeb/CSS/ComputedProperties.h

@@ -74,6 +74,7 @@ public:
     Optional<LengthPercentage> length_percentage(CSS::PropertyID) const;
     LengthBox length_box(CSS::PropertyID left_id, CSS::PropertyID top_id, CSS::PropertyID right_id, CSS::PropertyID bottom_id, const CSS::Length& default_value) const;
     Color color_or_fallback(CSS::PropertyID, Layout::NodeWithStyle const&, Color fallback) const;
+    CSS::PreferredColorScheme color_scheme(CSS::PreferredColorScheme) const;
     Optional<CSS::TextAnchor> text_anchor() const;
     Optional<CSS::TextAlign> text_align() const;
     Optional<CSS::TextJustify> text_justify() const;

Libraries/LibWeb/CSS/ComputedValues.h

@@ -22,6 +22,7 @@
 #include <LibWeb/CSS/GridTrackSize.h>
 #include <LibWeb/CSS/LengthBox.h>
 #include <LibWeb/CSS/PercentageOr.h>
+#include <LibWeb/CSS/PreferredColorScheme.h>
 #include <LibWeb/CSS/Ratio.h>
 #include <LibWeb/CSS/Size.h>
 #include <LibWeb/CSS/StyleValues/AbstractImageStyleValue.h>
@@ -76,6 +77,7 @@ public:
     static CSS::CaptionSide caption_side() { return CSS::CaptionSide::Top; }
     static CSS::Clear clear() { return CSS::Clear::None; }
     static CSS::Clip clip() { return CSS::Clip::make_auto(); }
+    static CSS::PreferredColorScheme color_scheme() { return CSS::PreferredColorScheme::Auto; }
     static CSS::ContentVisibility content_visibility() { return CSS::ContentVisibility::Visible; }
     static CSS::Cursor cursor() { return CSS::Cursor::Auto; }
     static CSS::WhiteSpace white_space() { return CSS::WhiteSpace::Normal; }
@@ -351,6 +353,7 @@ public:
     CSS::CaptionSide caption_side() const { return m_inherited.caption_side; }
     CSS::Clear clear() const { return m_noninherited.clear; }
     CSS::Clip clip() const { return m_noninherited.clip; }
+    CSS::PreferredColorScheme color_scheme() const { return m_inherited.color_scheme; }
     CSS::ContentVisibility content_visibility() const { return m_inherited.content_visibility; }
     CSS::Cursor cursor() const { return m_inherited.cursor; }
     CSS::ContentData content() const { return m_noninherited.content; }
@@ -543,6 +546,7 @@ protected:
         CSS::Length border_spacing_vertical { InitialValues::border_spacing() };
         CSS::CaptionSide caption_side { InitialValues::caption_side() };
         Color color { InitialValues::color() };
+        CSS::PreferredColorScheme color_scheme { InitialValues::color_scheme() };
         Optional<Color> accent_color {};
         Color webkit_text_fill_color { InitialValues::color() };
         CSS::ContentVisibility content_visibility { InitialValues::content_visibility() };
@@ -724,6 +728,7 @@ public:
     void set_border_spacing_vertical(CSS::Length border_spacing_vertical) { m_inherited.border_spacing_vertical = border_spacing_vertical; }
     void set_caption_side(CSS::CaptionSide caption_side) { m_inherited.caption_side = caption_side; }
     void set_color(Color color) { m_inherited.color = color; }
+    void set_color_scheme(CSS::PreferredColorScheme color_scheme) { m_inherited.color_scheme = color_scheme; }
     void set_clip(CSS::Clip const& clip) { m_noninherited.clip = clip; }
     void set_content(ContentData const& content) { m_noninherited.content = content; }
     void set_content_visibility(CSS::ContentVisibility content_visibility) { m_inherited.content_visibility = content_visibility; }

Libraries/LibWeb/CSS/Default.css

@@ -5,7 +5,6 @@
 
 html {
     font-family: serif;
-    color: CanvasText;
 }
 
 body {
@@ -54,15 +53,12 @@ button, input[type=submit], input[type=button], input[type=reset], select, ::fil
     border: 1px solid ButtonBorder;
     color: ButtonText;
     cursor: default;
+    /* FIXME: For some reason this filter is required for the :hover style to work */
+    filter: contrast(100%);
 }
 
 button:disabled, input[type=submit]:disabled, input[type=button]:disabled, input[type=reset]:disabled, select:disabled {
-    /* FIXME: There isn't a <system-color> keyword for this, so this is a slightly lightened
-     *        version of our light ButtonFace color. Once we support `color-scheme: dark`
-     *        we'll need to use a different color for that.
-     */
-    background-color: #e5e0d7;
-    color: GrayText;
+    filter: contrast(70%);
 }
 
 input[type=image] {
@@ -70,11 +66,7 @@ input[type=image] {
 }
 
 button:hover, input[type=submit]:hover, input[type=button]:hover, input[type=reset]:hover, select:hover {
-    /* FIXME: There isn't a <system-color> keyword for this, so this is a slightly lightened
-     *        version of our light ButtonFace color. Once we support `color-scheme: dark`
-     *        we'll need to use a different color for that.
-     */
-    background-color: #e5e0d7;
+    filter: contrast(70%);
 }
 
 option {
@@ -95,7 +87,7 @@ input[type=range]::-webkit-slider-runnable-track {
     height: 4px;
     width: 100%;
     margin-top: 6px;
-    background-color: Background;
+    background-color: AccentColorText;
     border: 1px solid rgba(0, 0, 0, 0.5);
 }
 input[type=range]::-webkit-slider-thumb {
@@ -143,7 +135,7 @@ progress::-webkit-progress-bar, progress::-webkit-progress-value {
     height: 100%;
 }
 progress::-webkit-progress-bar {
-    background-color: Background;
+    background-color: AccentColorText;
     border: 1px solid rgba(0, 0, 0, 0.5);
 }
 
@@ -862,6 +854,8 @@ progress {
 /* https://github.com/whatwg/html/pull/9546
  */
 input[type=checkbox][switch] {
+    /* FIXME: Workaround until we can properly style dark switches */
+    color-scheme: light;
 	appearance: none;
 	height: 1em;
 	width: 1.8em;

Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -42,6 +42,7 @@
 #include <LibWeb/CSS/StyleValues/CSSLCHLike.h>
 #include <LibWeb/CSS/StyleValues/CSSLabLike.h>
 #include <LibWeb/CSS/StyleValues/CSSRGB.h>
+#include <LibWeb/CSS/StyleValues/ColorSchemeStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ContentStyleValue.h>
 #include <LibWeb/CSS/StyleValues/CounterDefinitionsStyleValue.h>
 #include <LibWeb/CSS/StyleValues/CounterStyleValue.h>
@@ -3612,6 +3613,71 @@ RefPtr<CSSStyleValue> Parser::parse_color_value(TokenStream<ComponentValue>& tok
     return {};
 }
 
+RefPtr<CSSStyleValue> Parser::parse_color_scheme_value(TokenStream<ComponentValue>& tokens)
+{
+    // normal | [ light | dark | <custom-ident> ]+ && only?
+
+    // normal
+    {
+        auto transaction = tokens.begin_transaction();
+        tokens.discard_whitespace();
+        if (tokens.consume_a_token().is_ident("normal"sv)) {
+            if (tokens.has_next_token())
+                return {};
+            transaction.commit();
+            return ColorSchemeStyleValue::normal();
+        }
+    }
+
+    bool only = false;
+    Vector<String> schemes;
+
+    // only? && (..)
+    {
+        auto transaction = tokens.begin_transaction();
+        tokens.discard_whitespace();
+        if (tokens.consume_a_token().is_ident("only"sv)) {
+            only = true;
+            transaction.commit();
+        }
+    }
+
+    // [ light | dark | <custom-ident> ]+
+    tokens.discard_whitespace();
+    while (tokens.has_next_token()) {
+        auto transaction = tokens.begin_transaction();
+
+        // The 'normal', 'light', 'dark', and 'only' keywords are not valid <custom-ident>s in this property.
+        // Note: only 'normal' is blacklisted here because 'light' and 'dark' aren't parsed differently and 'only' is checked for afterwards
+        auto ident = parse_custom_ident_value(tokens, { "normal"sv });
+        if (!ident)
+            return {};
+
+        if (ident->custom_ident() == "only"_fly_string)
+            break;
+
+        schemes.append(ident->custom_ident().to_string());
+        tokens.discard_whitespace();
+        transaction.commit();
+    }
+
+    // (..) && only?
+    if (!only) {
+        auto transaction = tokens.begin_transaction();
+        tokens.discard_whitespace();
+        if (tokens.consume_a_token().is_ident("only"sv)) {
+            only = true;
+            transaction.commit();
+        }
+    }
+
+    tokens.discard_whitespace();
+    if (tokens.has_next_token() || schemes.is_empty())
+        return {};
+
+    return ColorSchemeStyleValue::create(schemes, only);
+}
+
 // https://drafts.csswg.org/css-lists-3/#counter-functions
 RefPtr<CSSStyleValue> Parser::parse_counter_value(TokenStream<ComponentValue>& tokens)
 {
@@ -8460,6 +8526,10 @@ Parser::ParseErrorOr<NonnullRefPtr<CSSStyleValue>> Parser::parse_css_value(Prope
         if (auto parsed_value = parse_shadow_value(tokens, AllowInsetKeyword::Yes); parsed_value && !tokens.has_next_token())
             return parsed_value.release_nonnull();
         return ParseError::SyntaxError;
+    case PropertyID::ColorScheme:
+        if (auto parsed_value = parse_color_scheme_value(tokens); parsed_value && !tokens.has_next_token())
+            return parsed_value.release_nonnull();
+        return ParseError::SyntaxError;
     case PropertyID::Columns:
         if (auto parsed_value = parse_columns_value(tokens); parsed_value && !tokens.has_next_token())
             return parsed_value.release_nonnull();

Libraries/LibWeb/CSS/Parser/Parser.h

@@ -292,6 +292,7 @@ private:
     RefPtr<CSSStyleValue> parse_oklch_color_value(TokenStream<ComponentValue>&);
     RefPtr<CSSStyleValue> parse_color_function(TokenStream<ComponentValue>&);
     RefPtr<CSSStyleValue> parse_color_value(TokenStream<ComponentValue>&);
+    RefPtr<CSSStyleValue> parse_color_scheme_value(TokenStream<ComponentValue>&);
     RefPtr<CSSStyleValue> parse_counter_value(TokenStream<ComponentValue>&);
     enum class AllowReversed {
         No,

Libraries/LibWeb/CSS/Properties.json

@@ -866,6 +866,12 @@
       "hashless-hex-color"
     ]
   },
+  "color-scheme": {
+    "affects-layout": false,
+    "animation-type": "discrete",
+    "inherited": true,
+    "initial": "normal"
+  },
   "column-count": {
     "animation-type": "by-computed-value",
     "inherited": false,

Libraries/LibWeb/CSS/StyleValues/CSSKeywordValue.cpp

@@ -141,16 +141,19 @@ Color CSSKeywordValue::to_color(Optional<Layout::NodeWithStyle const&> node) con
         return node->computed_values().color();
     }
 
-    // First, handle <system-color>s, since they don't require a node.
+    PreferredColorScheme scheme = PreferredColorScheme::Light;
+    if (node.has_value()) {
+        scheme = node->computed_values().color_scheme();
+    }
+
+    // First, handle <system-color>s, since they don't strictly require a node.
     // https://www.w3.org/TR/css-color-4/#css-system-colors
     // https://www.w3.org/TR/css-color-4/#deprecated-system-colors
     switch (keyword()) {
     case Keyword::Accentcolor:
-        return SystemColor::accent_color();
+        return SystemColor::accent_color(scheme);
     case Keyword::Accentcolortext:
-        return SystemColor::accent_color_text();
-    case Keyword::Activetext:
-        return SystemColor::active_text();
+        return SystemColor::accent_color_text(scheme);
     case Keyword::Buttonborder:
     case Keyword::Activeborder:
     case Keyword::Inactiveborder:
@@ -159,14 +162,14 @@ Color CSSKeywordValue::to_color(Optional<Layout::NodeWithStyle const&> node) con
     case Keyword::Threedlightshadow:
     case Keyword::Threedshadow:
     case Keyword::Windowframe:
-        return SystemColor::button_border();
+        return SystemColor::button_border(scheme);
     case Keyword::Buttonface:
     case Keyword::Buttonhighlight:
     case Keyword::Buttonshadow:
     case Keyword::Threedface:
-        return SystemColor::button_face();
+        return SystemColor::button_face(scheme);
     case Keyword::Buttontext:
-        return SystemColor::button_text();
+        return SystemColor::button_text(scheme);
     case Keyword::Canvas:
     case Keyword::Appworkspace:
     case Keyword::Background:
@@ -175,35 +178,33 @@ Color CSSKeywordValue::to_color(Optional<Layout::NodeWithStyle const&> node) con
     case Keyword::Menu:
     case Keyword::Scrollbar:
     case Keyword::Window:
-        return SystemColor::canvas();
+        return SystemColor::canvas(scheme);
     case Keyword::Canvastext:
     case Keyword::Activecaption:
     case Keyword::Captiontext:
     case Keyword::Infotext:
     case Keyword::Menutext:
     case Keyword::Windowtext:
-        return SystemColor::canvas_text();
+        return SystemColor::canvas_text(scheme);
     case Keyword::Field:
-        return SystemColor::field();
+        return SystemColor::field(scheme);
     case Keyword::Fieldtext:
-        return SystemColor::field_text();
+        return SystemColor::field_text(scheme);
     case Keyword::Graytext:
     case Keyword::Inactivecaptiontext:
-        return SystemColor::gray_text();
+        return SystemColor::gray_text(scheme);
     case Keyword::Highlight:
-        return SystemColor::highlight();
+        return SystemColor::highlight(scheme);
     case Keyword::Highlighttext:
-        return SystemColor::highlight_text();
+        return SystemColor::highlight_text(scheme);
     case Keyword::Mark:
-        return SystemColor::mark();
+        return SystemColor::mark(scheme);
     case Keyword::Marktext:
-        return SystemColor::mark_text();
+        return SystemColor::mark_text(scheme);
     case Keyword::Selecteditem:
-        return SystemColor::selected_item();
+        return SystemColor::selected_item(scheme);
     case Keyword::Selecteditemtext:
-        return SystemColor::selected_item_text();
-    case Keyword::Visitedtext:
-        return SystemColor::visited_text();
+        return SystemColor::selected_item_text(scheme);
     default:
         break;
     }
@@ -213,9 +214,19 @@ Color CSSKeywordValue::to_color(Optional<Layout::NodeWithStyle const&> node) con
         return Color::Black;
     }
 
-    auto& document = node->document();
-    if (keyword() == Keyword::LibwebLink || keyword() == Keyword::Linktext)
-        return document.normal_link_color();
+    auto const& document = node->document();
+
+    switch (keyword()) {
+    case Keyword::LibwebLink:
+    case Keyword::Linktext:
+        return document.normal_link_color().value_or(SystemColor::link_text(scheme));
+    case Keyword::Visitedtext:
+        return document.visited_link_color().value_or(SystemColor::visited_text(scheme));
+    case Keyword::Activetext:
+        return document.active_link_color().value_or(SystemColor::active_text(scheme));
+    default:
+        break;
+    }
 
     auto palette = document.page().palette();
     switch (keyword()) {

Libraries/LibWeb/CSS/StyleValues/ColorSchemeStyleValue.cpp

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2025, Ladybird contributors
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "ColorSchemeStyleValue.h"
+#include <LibWeb/CSS/Serialize.h>
+
+namespace Web::CSS {
+
+String ColorSchemeStyleValue::to_string(SerializationMode) const
+{
+    if (schemes().is_empty())
+        return "normal"_string;
+
+    StringBuilder builder;
+    bool first = true;
+    for (auto const& scheme : schemes()) {
+        if (first) {
+            first = false;
+        } else {
+            builder.append(' ');
+        }
+        builder.append(serialize_an_identifier(scheme));
+    }
+
+    if (only())
+        builder.append(" only"sv);
+
+    return MUST(builder.to_string());
+}
+
+}

Libraries/LibWeb/CSS/StyleValues/ColorSchemeStyleValue.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2025, Ladybird contributors
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/CSS/CSSStyleValue.h>
+
+namespace Web::CSS {
+
+class ColorSchemeStyleValue final : public StyleValueWithDefaultOperators<ColorSchemeStyleValue> {
+public:
+    static ValueComparingNonnullRefPtr<ColorSchemeStyleValue> create(Vector<String> schemes, bool only)
+    {
+        return adopt_ref(*new (nothrow) ColorSchemeStyleValue(move(schemes), only));
+    }
+    static ValueComparingNonnullRefPtr<ColorSchemeStyleValue> normal()
+    {
+        return adopt_ref(*new (nothrow) ColorSchemeStyleValue({}, false));
+    }
+    virtual ~ColorSchemeStyleValue() override = default;
+
+    Vector<String> const& schemes() const { return m_properties.schemes; }
+    bool const& only() const { return m_properties.only; }
+    virtual String to_string(SerializationMode) const override;
+
+    bool properties_equal(ColorSchemeStyleValue const& other) const { return m_properties == other.m_properties; }
+
+private:
+    ColorSchemeStyleValue(Vector<String> schemes, bool only)
+        : StyleValueWithDefaultOperators(Type::ColorScheme)
+        , m_properties { .schemes = move(schemes), .only = only }
+    {
+    }
+
+    struct Properties {
+        Vector<String> schemes;
+        bool only;
+        bool operator==(Properties const&) const = default;
+    } m_properties;
+};
+}

Libraries/LibWeb/CSS/SystemColor.cpp

@@ -8,98 +8,134 @@
 
 namespace Web::CSS::SystemColor {
 
-Color accent_color()
+Color accent_color(PreferredColorScheme)
 {
     return Color(61, 174, 233);
 }
 
-Color accent_color_text()
+Color accent_color_text(PreferredColorScheme)
 {
     return Color(255, 255, 255);
 }
 
-Color active_text()
+Color active_text(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(213, 97, 82);
+    }
     return Color(255, 0, 0);
 }
 
-Color button_border()
+Color button_border(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(72, 72, 72);
+    }
     return Color(128, 128, 128);
 }
 
-Color button_face()
+Color button_face(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(32, 29, 25);
+    }
     return Color(212, 208, 200);
 }
 
-Color button_text()
+Color button_text(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(235, 235, 235);
+    }
     return Color(0, 0, 0);
 }
 
-Color canvas()
+Color canvas(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(20, 20, 20);
+    }
     return Color(255, 255, 255);
 }
 
-Color canvas_text()
+Color canvas_text(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(235, 235, 235);
+    }
     return Color(0, 0, 0);
 }
 
-Color field()
+Color field(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(32, 29, 25);
+    }
     return Color(255, 255, 255);
 }
 
-Color field_text()
+Color field_text(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(235, 235, 235);
+    }
     return Color(0, 0, 0);
 }
 
-Color gray_text()
+Color gray_text(PreferredColorScheme)
 {
     return Color(128, 128, 128);
 }
 
-Color highlight()
+Color highlight(PreferredColorScheme)
 {
     return Color(61, 174, 233);
 }
 
-Color highlight_text()
+Color highlight_text(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(20, 20, 20);
+    }
     return Color(255, 255, 255);
 }
 
-Color link_text()
+Color link_text(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(100, 149, 237);
+    }
     return Color(0, 0, 238);
 }
 
-Color mark()
+Color mark(PreferredColorScheme)
 {
     return Color(255, 255, 0);
 }
 
-Color mark_text()
+Color mark_text(PreferredColorScheme)
 {
     return Color(0, 0, 0);
 }
 
-Color selected_item()
+Color selected_item(PreferredColorScheme)
 {
     return Color(61, 174, 233);
 }
 
-Color selected_item_text()
+Color selected_item_text(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(20, 20, 20);
+    }
     return Color(255, 255, 255);
 }
 
-Color visited_text()
+Color visited_text(PreferredColorScheme scheme)
 {
+    if (scheme == PreferredColorScheme::Dark) {
+        return Color(156, 113, 212);
+    }
     return Color(85, 26, 139);
 }
 

Libraries/LibWeb/CSS/SystemColor.h

@@ -7,29 +7,28 @@
 #pragma once
 
 #include <LibGfx/Color.h>
+#include <LibWeb/CSS/PreferredColorScheme.h>
 
 // https://www.w3.org/TR/css-color-4/#css-system-colors
 namespace Web::CSS::SystemColor {
 
-// FIXME: Provide colors for `color-scheme: dark` once we support that.
-Color accent_color();
-Color accent_color_text();
-Color active_text();
-Color button_border();
-Color button_face();
-Color button_text();
-Color canvas();
-Color canvas_text();
-Color field();
-Color field_text();
-Color gray_text();
-Color highlight();
-Color highlight_text();
-Color link_text();
-Color mark();
-Color mark_text();
-Color selected_item();
-Color selected_item_text();
-Color visited_text();
-
+Color accent_color(PreferredColorScheme);
+Color accent_color_text(PreferredColorScheme);
+Color active_text(PreferredColorScheme);
+Color button_border(PreferredColorScheme);
+Color button_face(PreferredColorScheme);
+Color button_text(PreferredColorScheme);
+Color canvas(PreferredColorScheme);
+Color canvas_text(PreferredColorScheme);
+Color field(PreferredColorScheme);
+Color field_text(PreferredColorScheme);
+Color gray_text(PreferredColorScheme);
+Color highlight(PreferredColorScheme);
+Color highlight_text(PreferredColorScheme);
+Color link_text(PreferredColorScheme);
+Color mark(PreferredColorScheme);
+Color mark_text(PreferredColorScheme);
+Color selected_item(PreferredColorScheme);
+Color selected_item_text(PreferredColorScheme);
+Color visited_text(PreferredColorScheme);
 }

Libraries/LibWeb/DOM/Document.cpp

@@ -1769,25 +1769,19 @@ void Document::release_events()
     // Do nothing
 }
 
-Color Document::normal_link_color() const
+Optional<Color> Document::normal_link_color() const
 {
-    if (m_normal_link_color.has_value())
-        return m_normal_link_color.value();
-    return CSS::SystemColor::link_text();
+    return m_normal_link_color;
 }
 
-Color Document::active_link_color() const
+Optional<Color> Document::active_link_color() const
 {
-    if (m_active_link_color.has_value())
-        return m_active_link_color.value();
-    return CSS::SystemColor::active_text();
+    return m_active_link_color;
 }
 
-Color Document::visited_link_color() const
+Optional<Color> Document::visited_link_color() const
 {
-    if (m_visited_link_color.has_value())
-        return m_visited_link_color.value();
-    return CSS::SystemColor::visited_text();
+    return m_visited_link_color;
 }
 
 // https://html.spec.whatwg.org/multipage/webappapis.html#relevant-settings-object
@@ -5912,13 +5906,38 @@ RefPtr<Painting::DisplayList> Document::record_display_list(PaintConfig config)
     auto display_list = Painting::DisplayList::create();
     Painting::DisplayListRecorder display_list_recorder(display_list);
 
+    // https://drafts.csswg.org/css-color-adjust-1/#color-scheme-effect
+    // On the root element, the used color scheme additionally must affect the surface color of the canvas, and the viewport’s scrollbars.
+    auto color_scheme = CSS::PreferredColorScheme::Light;
+    if (auto* html_element = this->html_element(); html_element && html_element->layout_node()) {
+        if (html_element->layout_node()->computed_values().color_scheme() == CSS::PreferredColorScheme::Dark)
+            color_scheme = CSS::PreferredColorScheme::Dark;
+    }
+
+    // .. in the case of embedded documents typically rendered over a transparent canvas
+    // (such as provided via an HTML iframe element), if the used color scheme of the element
+    // and the used color scheme of the embedded document’s root element do not match,
+    // then the UA must use an opaque canvas of the Canvas color appropriate to the
+    // embedded document’s used color scheme instead of a transparent canvas.
+    bool opaque_canvas = false;
+    if (auto container_element = navigable()->container(); container_element && container_element->layout_node()) {
+        auto container_scheme = container_element->layout_node()->computed_values().color_scheme();
+        if (container_scheme == CSS::PreferredColorScheme::Auto)
+            container_scheme = CSS::PreferredColorScheme::Light;
+
+        opaque_canvas = container_scheme != color_scheme;
+    }
+
     if (config.canvas_fill_rect.has_value()) {
-        display_list_recorder.fill_rect(config.canvas_fill_rect.value(), CSS::SystemColor::canvas());
+        display_list_recorder.fill_rect(config.canvas_fill_rect.value(), CSS::SystemColor::canvas(color_scheme));
     }
 
     auto viewport_rect = page().css_to_device_rect(this->viewport_rect());
     Gfx::IntRect bitmap_rect { {}, viewport_rect.size().to_type<int>() };
 
+    if (opaque_canvas)
+        display_list_recorder.fill_rect(bitmap_rect, CSS::SystemColor::canvas(color_scheme));
+
     display_list_recorder.fill_rect(bitmap_rect, background_color());
     if (!paintable()) {
         VERIFY_NOT_REACHED();

Libraries/LibWeb/DOM/Document.h

@@ -233,13 +233,13 @@ public:
     Color background_color() const;
     Vector<CSS::BackgroundLayerData> const* background_layers() const;
 
-    Color normal_link_color() const;
+    Optional<Color> normal_link_color() const;
     void set_normal_link_color(Color);
 
-    Color active_link_color() const;
+    Optional<Color> active_link_color() const;
     void set_active_link_color(Color);
 
-    Color visited_link_color() const;
+    Optional<Color> visited_link_color() const;
     void set_visited_link_color(Color);
 
     void update_style();

Libraries/LibWeb/Forward.h

@@ -116,6 +116,7 @@ class BasicShapeStyleValue;
 class BorderRadiusStyleValue;
 class CalculatedStyleValue;
 class Clip;
+class ColorSchemeStyleValue;
 class ConicGradientStyleValue;
 class ContentStyleValue;
 class CounterDefinitionsStyleValue;

Libraries/LibWeb/HTML/HTMLInputElement.cpp

@@ -1181,8 +1181,7 @@ void HTMLInputElement::computed_properties_changed()
     if (!appearance.has_value() || *appearance == CSS::Appearance::None)
         return;
 
-    auto palette = document().page().palette();
-    auto accent_color = palette.color(ColorRole::Accent).to_string();
+    auto accent_color = MUST(String::from_utf8(CSS::string_from_keyword(CSS::Keyword::Accentcolor)));
 
     auto const& accent_color_property = computed_properties()->property(CSS::PropertyID::AccentColor);
     if (accent_color_property.has_color())

Libraries/LibWeb/HTML/HTMLProgressElement.cpp

@@ -8,6 +8,7 @@
 
 #include <LibWeb/Bindings/HTMLProgressElementPrototype.h>
 #include <LibWeb/CSS/ComputedProperties.h>
+#include <LibWeb/CSS/StyleValues/CSSKeywordValue.h>
 #include <LibWeb/CSS/StyleValues/DisplayStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/ElementFactory.h>
@@ -132,8 +133,7 @@ void HTMLProgressElement::update_progress_value_element()
 
 void HTMLProgressElement::computed_properties_changed()
 {
-    auto palette = document().page().palette();
-    auto accent_color = palette.color(ColorRole::Accent).to_string();
+    auto accent_color = MUST(String::from_utf8(CSS::string_from_keyword(CSS::Keyword::Accentcolor)));
 
     auto const& accent_color_property = computed_properties()->property(CSS::PropertyID::AccentColor);
     if (accent_color_property.has_color())

Libraries/LibWeb/Layout/Node.cpp

@@ -328,7 +328,15 @@ void NodeWithStyle::apply_style(const CSS::ComputedProperties& computed_style)
 {
     auto& computed_values = mutable_computed_values();
 
-    // NOTE: color must be set first to ensure currentColor can be resolved in other properties (e.g. background-color).
+    // NOTE: color-scheme must be set first to ensure system colors can be resolved correctly.
+    auto preferred_color_scheme = document().page().preferred_color_scheme();
+    // FIXME: We can't just check for Auto because page().preferred_color_scheme() returns garbage data after startup.
+    if (preferred_color_scheme != CSS::PreferredColorScheme::Dark && preferred_color_scheme != CSS::PreferredColorScheme::Light) {
+        preferred_color_scheme = document().page().palette().is_dark() ? CSS::PreferredColorScheme::Dark : CSS::PreferredColorScheme::Light;
+    }
+    computed_values.set_color_scheme(computed_style.color_scheme(preferred_color_scheme));
+
+    // NOTE: color must be set second to ensure currentColor can be resolved in other properties (e.g. background-color).
     computed_values.set_color(computed_style.color_or_fallback(CSS::PropertyID::Color, *this, CSS::InitialValues::color()));
 
     // NOTE: We have to be careful that font-related properties get set in the right order.

Libraries/LibWeb/Painting/BorderPainting.cpp

@@ -7,6 +7,7 @@
  */
 
 #include <AK/CircularQueue.h>
+#include <LibWeb/CSS/StyleValues/CSSKeywordValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/Layout/Node.h>
 
@@ -579,7 +580,7 @@ Optional<BordersData> borders_data_for_outline(Layout::Node const& layout_node,
     if (outline_style == CSS::OutlineStyle::Auto) {
         // `auto` lets us do whatever we want for the outline. 2px of the link colour seems reasonable.
         line_style = CSS::LineStyle::Dotted;
-        outline_color = layout_node.document().normal_link_color();
+        outline_color = CSS::CSSKeywordValue::create(CSS::Keyword::Linktext)->to_color(*static_cast<Layout::NodeWithStyle const*>(&layout_node));
         outline_width = 2;
     } else {
         line_style = CSS::keyword_to_line_style(CSS::to_keyword(outline_style)).value_or(CSS::LineStyle::None);

Libraries/LibWeb/Painting/CheckBoxPaintable.cpp

@@ -72,10 +72,8 @@ void CheckBoxPaintable::paint(PaintContext& context, PaintPhase phase) const
     auto checkbox_rect = context.enclosing_device_rect(absolute_rect()).to_type<int>();
     auto checkbox_radius = checkbox_rect.width() / 5;
 
-    auto& palette = context.palette();
-
     auto shade = [&](Color color, float amount) {
-        return InputColors::get_shade(color, amount, palette.is_dark());
+        return InputColors::get_shade(color, amount, computed_values().color_scheme());
     };
 
     auto modify_color = [&](Color color) {
@@ -84,7 +82,7 @@ void CheckBoxPaintable::paint(PaintContext& context, PaintPhase phase) const
         return color;
     };
 
-    auto input_colors = compute_input_colors(palette, computed_values().accent_color());
+    auto input_colors = compute_input_colors(computed_values().color_scheme(), computed_values().accent_color());
 
     auto increase_contrast = [&](Color color, Color background) {
         auto constexpr min_contrast = 2;

Libraries/LibWeb/Painting/InputColors.h

@@ -9,6 +9,7 @@
 #include <AK/Optional.h>
 #include <LibGfx/Color.h>
 #include <LibGfx/Palette.h>
+#include <LibWeb/CSS/SystemColor.h>
 
 namespace Web::Painting {
 
@@ -25,24 +26,24 @@ struct InputColors {
     Color background_color(bool enabled) { return enabled ? base : light_gray; }
     Color border_color(bool enabled) { return enabled ? gray : mid_gray; }
 
-    static Color get_shade(Color color, float amount, bool is_dark_theme)
+    static Color get_shade(Color color, float amount, CSS::PreferredColorScheme color_scheme)
     {
-        return color.mixed_with(is_dark_theme ? Color::Black : Color::White, amount);
+        auto base_color = CSS::SystemColor::canvas(color_scheme);
+        return color.mixed_with(base_color, amount);
     }
 };
 
-static InputColors compute_input_colors(Palette const& palette, Optional<Color> accent_color)
+static InputColors compute_input_colors(CSS::PreferredColorScheme color_scheme, Optional<Color> accent_color)
 {
     // These shades have been picked to work well for all themes and have enough variation to paint
     // all input states (disabled, enabled, checked, etc).
-    bool dark_theme = palette.is_dark();
-    auto base_text_color = palette.color(ColorRole::BaseText);
-    auto accent = accent_color.value_or(palette.color(ColorRole::Accent));
-    auto base = InputColors::get_shade(base_text_color.inverted(), 0.8f, dark_theme);
-    auto dark_gray = InputColors::get_shade(base_text_color, 0.3f, dark_theme);
-    auto gray = InputColors::get_shade(dark_gray, 0.4f, dark_theme);
-    auto mid_gray = InputColors::get_shade(gray, 0.3f, dark_theme);
-    auto light_gray = InputColors::get_shade(mid_gray, 0.3f, dark_theme);
+    auto base_text_color = CSS::SystemColor::canvas_text(color_scheme);
+    auto accent = accent_color.value_or(CSS::SystemColor::accent_color(color_scheme));
+    auto base = InputColors::get_shade(base_text_color.inverted(), 0.8f, color_scheme);
+    auto dark_gray = InputColors::get_shade(base_text_color, 0.3f, color_scheme);
+    auto gray = InputColors::get_shade(dark_gray, 0.4f, color_scheme);
+    auto mid_gray = InputColors::get_shade(gray, 0.3f, color_scheme);
+    auto light_gray = InputColors::get_shade(mid_gray, 0.3f, color_scheme);
     return InputColors {
         .accent = accent,
         .base = base,

Libraries/LibWeb/Painting/PaintableBox.cpp

@@ -692,10 +692,10 @@ void paint_text_fragment(PaintContext& context, TextPaintable const& paintable,
 
         auto selection_rect = context.enclosing_device_rect(fragment.selection_rect()).to_type<int>();
         if (!selection_rect.is_empty()) {
-            painter.fill_rect(selection_rect, CSS::SystemColor::highlight());
+            painter.fill_rect(selection_rect, CSS::SystemColor::highlight(paintable.computed_values().color_scheme()));
             DisplayListRecorderStateSaver saver(painter);
             painter.add_clip_rect(selection_rect);
-            painter.draw_text_run(baseline_start, *glyph_run, CSS::SystemColor::highlight_text(), fragment_absolute_device_rect.to_type<int>(), scale, fragment.orientation());
+            painter.draw_text_run(baseline_start, *glyph_run, CSS::SystemColor::highlight_text(paintable.computed_values().color_scheme()), fragment_absolute_device_rect.to_type<int>(), scale, fragment.orientation());
         }
 
         paint_text_decoration(context, paintable, fragment);

Libraries/LibWeb/Painting/RadioButtonPaintable.cpp

@@ -49,9 +49,8 @@ void RadioButtonPaintable::paint(PaintContext& context, PaintPhase phase) const
 
     auto const& radio_button = static_cast<HTML::HTMLInputElement const&>(layout_box().dom_node());
 
-    auto& palette = context.palette();
     bool enabled = layout_box().dom_node().enabled();
-    auto input_colors = compute_input_colors(palette, computed_values().accent_color());
+    auto input_colors = compute_input_colors(computed_values().color_scheme(), computed_values().accent_color());
 
     auto background_color = input_colors.background_color(enabled);
     auto accent = input_colors.accent;
@@ -71,7 +70,7 @@ void RadioButtonPaintable::paint(PaintContext& context, PaintPhase phase) const
             return input_colors.mid_gray;
         auto color = radio_color();
         if (being_pressed())
-            color = InputColors::get_shade(color, 0.3f, palette.is_dark());
+            color = InputColors::get_shade(color, 0.3f, computed_values().color_scheme());
         return color;
     }();
 

Libraries/LibWebView/ProcessManager.cpp

@@ -130,12 +130,6 @@ String ProcessManager::generate_html()
         <title>Task Manager</title>
         <style>
                 @media (prefers-color-scheme: dark) {
-                    /* FIXME: We should be able to remove the HTML style when "color-scheme" is supported */
-                    html {
-                        background-color: rgb(30, 30, 30);
-                        color: white;
-                    }
-
                     tr:nth-child(even) {
                         background: rgb(57, 57, 57);
                     }
@@ -147,6 +141,10 @@ String ProcessManager::generate_html()
                     }
                 }
 
+                html {
+                    color-scheme: light dark;
+                }
+
                 table {
                     width: 100%;
                     border-collapse: collapse;

Libraries/LibWebView/SourceHighlighter.h

@@ -79,13 +79,6 @@ String highlight_source(URL::URL const& url, URL::URL const& base_url, StringVie
 
 constexpr inline StringView HTML_HIGHLIGHTER_STYLE = R"~~~(
     @media (prefers-color-scheme: dark) {
-        /* FIXME: We should be able to remove the HTML style when "color-scheme" is supported */
-        html {
-            background-color: rgb(30, 30, 30);
-            color: white;
-            counter-reset: line;
-        }
-
         :root {
             --comment-color: lightgreen;
             --keyword-color: orangered;
@@ -111,6 +104,10 @@ constexpr inline StringView HTML_HIGHLIGHTER_STYLE = R"~~~(
         }
     }
 
+    html {
+        color-scheme: light dark;
+    }
+
     .html {
         font-size: 10pt;
         font-family: Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

Tests/LibWeb/Text/expected/css/CSSStyleDeclaration-all-supported-properties-and-default-values.txt

@@ -1,6 +1,6 @@
 All supported properties and their default values exposed from CSSStyleDeclaration from getComputedStyle:
 'cssText': ''
-'length': '212'
+'length': '213'
 'parentRule': 'null'
 'cssFloat': 'none'
 'WebkitAlignContent': 'normal'
@@ -250,6 +250,8 @@ All supported properties and their default values exposed from CSSStyleDeclarati
 'clipRule': 'nonzero'
 'clip-rule': 'nonzero'
 'color': 'rgb(0, 0, 0)'
+'colorScheme': 'normal'
+'color-scheme': 'normal'
 'columnCount': 'auto'
 'column-count': 'auto'
 'columnGap': 'normal'

Tests/LibWeb/Text/expected/css/CSSStyleDeclaration-has-indexed-property-getter.txt

@@ -7,211 +7,212 @@ All properties associated with getComputedStyle(document.body):
     "4": "caption-side",
     "5": "clip-rule",
     "6": "color",
-    "7": "cursor",
-    "8": "direction",
-    "9": "fill",
-    "10": "fill-opacity",
-    "11": "fill-rule",
-    "12": "font-family",
-    "13": "font-feature-settings",
-    "14": "font-language-override",
-    "15": "font-size",
-    "16": "font-style",
-    "17": "font-variant-alternates",
-    "18": "font-variant-caps",
-    "19": "font-variant-east-asian",
-    "20": "font-variant-emoji",
-    "21": "font-variant-ligatures",
-    "22": "font-variant-numeric",
-    "23": "font-variant-position",
-    "24": "font-variation-settings",
-    "25": "font-weight",
-    "26": "font-width",
-    "27": "image-rendering",
-    "28": "letter-spacing",
-    "29": "line-height",
-    "30": "list-style-image",
-    "31": "list-style-position",
-    "32": "list-style-type",
-    "33": "math-depth",
-    "34": "math-shift",
-    "35": "math-style",
-    "36": "pointer-events",
-    "37": "quotes",
-    "38": "stroke",
-    "39": "stroke-dasharray",
-    "40": "stroke-dashoffset",
-    "41": "stroke-linecap",
-    "42": "stroke-linejoin",
-    "43": "stroke-miterlimit",
-    "44": "stroke-opacity",
-    "45": "stroke-width",
-    "46": "tab-size",
-    "47": "text-align",
-    "48": "text-anchor",
-    "49": "text-decoration-line",
-    "50": "text-indent",
-    "51": "text-justify",
-    "52": "text-shadow",
-    "53": "text-transform",
-    "54": "visibility",
-    "55": "white-space",
-    "56": "word-break",
-    "57": "word-spacing",
-    "58": "word-wrap",
-    "59": "writing-mode",
-    "60": "align-content",
-    "61": "align-items",
-    "62": "align-self",
-    "63": "animation-delay",
-    "64": "animation-direction",
-    "65": "animation-duration",
-    "66": "animation-fill-mode",
-    "67": "animation-iteration-count",
-    "68": "animation-name",
-    "69": "animation-play-state",
-    "70": "animation-timing-function",
-    "71": "appearance",
-    "72": "aspect-ratio",
-    "73": "backdrop-filter",
-    "74": "background-attachment",
-    "75": "background-clip",
-    "76": "background-color",
-    "77": "background-image",
-    "78": "background-origin",
-    "79": "background-position-x",
-    "80": "background-position-y",
-    "81": "background-repeat",
-    "82": "background-size",
-    "83": "border-bottom-color",
-    "84": "border-bottom-left-radius",
-    "85": "border-bottom-right-radius",
-    "86": "border-bottom-style",
-    "87": "border-bottom-width",
-    "88": "border-left-color",
-    "89": "border-left-style",
-    "90": "border-left-width",
-    "91": "border-right-color",
-    "92": "border-right-style",
-    "93": "border-right-width",
-    "94": "border-top-color",
-    "95": "border-top-left-radius",
-    "96": "border-top-right-radius",
-    "97": "border-top-style",
-    "98": "border-top-width",
-    "99": "bottom",
-    "100": "box-shadow",
-    "101": "box-sizing",
-    "102": "clear",
-    "103": "clip",
-    "104": "clip-path",
-    "105": "column-count",
-    "106": "column-gap",
-    "107": "column-span",
-    "108": "column-width",
-    "109": "content",
-    "110": "content-visibility",
-    "111": "counter-increment",
-    "112": "counter-reset",
-    "113": "counter-set",
-    "114": "cx",
-    "115": "cy",
-    "116": "display",
-    "117": "filter",
-    "118": "flex-basis",
-    "119": "flex-direction",
-    "120": "flex-grow",
-    "121": "flex-shrink",
-    "122": "flex-wrap",
-    "123": "float",
-    "124": "grid-auto-columns",
-    "125": "grid-auto-flow",
-    "126": "grid-auto-rows",
-    "127": "grid-column-end",
-    "128": "grid-column-start",
-    "129": "grid-row-end",
-    "130": "grid-row-start",
-    "131": "grid-template-areas",
-    "132": "grid-template-columns",
-    "133": "grid-template-rows",
-    "134": "height",
-    "135": "inline-size",
-    "136": "inset-block-end",
-    "137": "inset-block-start",
-    "138": "inset-inline-end",
-    "139": "inset-inline-start",
-    "140": "justify-content",
-    "141": "justify-items",
-    "142": "justify-self",
-    "143": "left",
-    "144": "margin-block-end",
-    "145": "margin-block-start",
-    "146": "margin-bottom",
-    "147": "margin-inline-end",
-    "148": "margin-inline-start",
-    "149": "margin-left",
-    "150": "margin-right",
-    "151": "margin-top",
-    "152": "mask",
-    "153": "mask-image",
-    "154": "mask-type",
-    "155": "max-height",
-    "156": "max-inline-size",
-    "157": "max-width",
-    "158": "min-height",
-    "159": "min-inline-size",
-    "160": "min-width",
-    "161": "object-fit",
-    "162": "object-position",
-    "163": "opacity",
-    "164": "order",
-    "165": "outline-color",
-    "166": "outline-offset",
-    "167": "outline-style",
-    "168": "outline-width",
-    "169": "overflow-x",
-    "170": "overflow-y",
-    "171": "padding-block-end",
-    "172": "padding-block-start",
-    "173": "padding-bottom",
-    "174": "padding-inline-end",
-    "175": "padding-inline-start",
-    "176": "padding-left",
-    "177": "padding-right",
-    "178": "padding-top",
-    "179": "position",
-    "180": "r",
-    "181": "right",
-    "182": "rotate",
-    "183": "row-gap",
-    "184": "rx",
-    "185": "ry",
-    "186": "scale",
-    "187": "scrollbar-gutter",
-    "188": "scrollbar-width",
-    "189": "stop-color",
-    "190": "stop-opacity",
-    "191": "table-layout",
-    "192": "text-decoration-color",
-    "193": "text-decoration-style",
-    "194": "text-decoration-thickness",
-    "195": "text-overflow",
-    "196": "top",
-    "197": "transform",
-    "198": "transform-box",
-    "199": "transform-origin",
-    "200": "transition-delay",
-    "201": "transition-duration",
-    "202": "transition-property",
-    "203": "transition-timing-function",
-    "204": "translate",
-    "205": "unicode-bidi",
-    "206": "user-select",
-    "207": "vertical-align",
-    "208": "width",
-    "209": "x",
-    "210": "y",
-    "211": "z-index"
+    "7": "color-scheme",
+    "8": "cursor",
+    "9": "direction",
+    "10": "fill",
+    "11": "fill-opacity",
+    "12": "fill-rule",
+    "13": "font-family",
+    "14": "font-feature-settings",
+    "15": "font-language-override",
+    "16": "font-size",
+    "17": "font-style",
+    "18": "font-variant-alternates",
+    "19": "font-variant-caps",
+    "20": "font-variant-east-asian",
+    "21": "font-variant-emoji",
+    "22": "font-variant-ligatures",
+    "23": "font-variant-numeric",
+    "24": "font-variant-position",
+    "25": "font-variation-settings",
+    "26": "font-weight",
+    "27": "font-width",
+    "28": "image-rendering",
+    "29": "letter-spacing",
+    "30": "line-height",
+    "31": "list-style-image",
+    "32": "list-style-position",
+    "33": "list-style-type",
+    "34": "math-depth",
+    "35": "math-shift",
+    "36": "math-style",
+    "37": "pointer-events",
+    "38": "quotes",
+    "39": "stroke",
+    "40": "stroke-dasharray",
+    "41": "stroke-dashoffset",
+    "42": "stroke-linecap",
+    "43": "stroke-linejoin",
+    "44": "stroke-miterlimit",
+    "45": "stroke-opacity",
+    "46": "stroke-width",
+    "47": "tab-size",
+    "48": "text-align",
+    "49": "text-anchor",
+    "50": "text-decoration-line",
+    "51": "text-indent",
+    "52": "text-justify",
+    "53": "text-shadow",
+    "54": "text-transform",
+    "55": "visibility",
+    "56": "white-space",
+    "57": "word-break",
+    "58": "word-spacing",
+    "59": "word-wrap",
+    "60": "writing-mode",
+    "61": "align-content",
+    "62": "align-items",
+    "63": "align-self",
+    "64": "animation-delay",
+    "65": "animation-direction",
+    "66": "animation-duration",
+    "67": "animation-fill-mode",
+    "68": "animation-iteration-count",
+    "69": "animation-name",
+    "70": "animation-play-state",
+    "71": "animation-timing-function",
+    "72": "appearance",
+    "73": "aspect-ratio",
+    "74": "backdrop-filter",
+    "75": "background-attachment",
+    "76": "background-clip",
+    "77": "background-color",
+    "78": "background-image",
+    "79": "background-origin",
+    "80": "background-position-x",
+    "81": "background-position-y",
+    "82": "background-repeat",
+    "83": "background-size",
+    "84": "border-bottom-color",
+    "85": "border-bottom-left-radius",
+    "86": "border-bottom-right-radius",
+    "87": "border-bottom-style",
+    "88": "border-bottom-width",
+    "89": "border-left-color",
+    "90": "border-left-style",
+    "91": "border-left-width",
+    "92": "border-right-color",
+    "93": "border-right-style",
+    "94": "border-right-width",
+    "95": "border-top-color",
+    "96": "border-top-left-radius",
+    "97": "border-top-right-radius",
+    "98": "border-top-style",
+    "99": "border-top-width",
+    "100": "bottom",
+    "101": "box-shadow",
+    "102": "box-sizing",
+    "103": "clear",
+    "104": "clip",
+    "105": "clip-path",
+    "106": "column-count",
+    "107": "column-gap",
+    "108": "column-span",
+    "109": "column-width",
+    "110": "content",
+    "111": "content-visibility",
+    "112": "counter-increment",
+    "113": "counter-reset",
+    "114": "counter-set",
+    "115": "cx",
+    "116": "cy",
+    "117": "display",
+    "118": "filter",
+    "119": "flex-basis",
+    "120": "flex-direction",
+    "121": "flex-grow",
+    "122": "flex-shrink",
+    "123": "flex-wrap",
+    "124": "float",
+    "125": "grid-auto-columns",
+    "126": "grid-auto-flow",
+    "127": "grid-auto-rows",
+    "128": "grid-column-end",
+    "129": "grid-column-start",
+    "130": "grid-row-end",
+    "131": "grid-row-start",
+    "132": "grid-template-areas",
+    "133": "grid-template-columns",
+    "134": "grid-template-rows",
+    "135": "height",
+    "136": "inline-size",
+    "137": "inset-block-end",
+    "138": "inset-block-start",
+    "139": "inset-inline-end",
+    "140": "inset-inline-start",
+    "141": "justify-content",
+    "142": "justify-items",
+    "143": "justify-self",
+    "144": "left",
+    "145": "margin-block-end",
+    "146": "margin-block-start",
+    "147": "margin-bottom",
+    "148": "margin-inline-end",
+    "149": "margin-inline-start",
+    "150": "margin-left",
+    "151": "margin-right",
+    "152": "margin-top",
+    "153": "mask",
+    "154": "mask-image",
+    "155": "mask-type",
+    "156": "max-height",
+    "157": "max-inline-size",
+    "158": "max-width",
+    "159": "min-height",
+    "160": "min-inline-size",
+    "161": "min-width",
+    "162": "object-fit",
+    "163": "object-position",
+    "164": "opacity",
+    "165": "order",
+    "166": "outline-color",
+    "167": "outline-offset",
+    "168": "outline-style",
+    "169": "outline-width",
+    "170": "overflow-x",
+    "171": "overflow-y",
+    "172": "padding-block-end",
+    "173": "padding-block-start",
+    "174": "padding-bottom",
+    "175": "padding-inline-end",
+    "176": "padding-inline-start",
+    "177": "padding-left",
+    "178": "padding-right",
+    "179": "padding-top",
+    "180": "position",
+    "181": "r",
+    "182": "right",
+    "183": "rotate",
+    "184": "row-gap",
+    "185": "rx",
+    "186": "ry",
+    "187": "scale",
+    "188": "scrollbar-gutter",
+    "189": "scrollbar-width",
+    "190": "stop-color",
+    "191": "stop-opacity",
+    "192": "table-layout",
+    "193": "text-decoration-color",
+    "194": "text-decoration-style",
+    "195": "text-decoration-thickness",
+    "196": "text-overflow",
+    "197": "top",
+    "198": "transform",
+    "199": "transform-box",
+    "200": "transform-origin",
+    "201": "transition-delay",
+    "202": "transition-duration",
+    "203": "transition-property",
+    "204": "transition-timing-function",
+    "205": "translate",
+    "206": "unicode-bidi",
+    "207": "user-select",
+    "208": "vertical-align",
+    "209": "width",
+    "210": "x",
+    "211": "y",
+    "212": "z-index"
 }
 All properties associated with document.body.style by default:
 {}

Tests/LibWeb/Text/expected/css/getComputedStyle-print-all.txt

@@ -5,6 +5,7 @@ border-spacing: 0px
 caption-side: top
 clip-rule: nonzero
 color: rgb(0, 0, 0)
+color-scheme: normal
 cursor: auto
 direction: ltr
 fill: rgb(0, 0, 0)
@@ -132,7 +133,7 @@ grid-row-start: auto
 grid-template-areas: none
 grid-template-columns: auto
 grid-template-rows: auto
-height: 2278px
+height: 2295px
 inline-size: auto
 inset-block-end: auto
 inset-block-start: auto