diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleValue.cpp b/Userland/Libraries/LibWeb/CSS/CSSStyleValue.cpp
index 2dfef14ea56..5276ab6fc6e 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleValue.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleValue.cpp
@@ -35,8 +35,6 @@
 #include <LibWeb/CSS/StyleValues/GridTrackPlacementStyleValue.h>
 #include <LibWeb/CSS/StyleValues/GridTrackSizeListStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ImageStyleValue.h>
-#include <LibWeb/CSS/StyleValues/InheritStyleValue.h>
-#include <LibWeb/CSS/StyleValues/InitialStyleValue.h>
 #include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
 #include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
 #include <LibWeb/CSS/StyleValues/LinearGradientStyleValue.h>
@@ -48,7 +46,6 @@
 #include <LibWeb/CSS/StyleValues/RatioStyleValue.h>
 #include <LibWeb/CSS/StyleValues/RectStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ResolutionStyleValue.h>
-#include <LibWeb/CSS/StyleValues/RevertStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ScrollbarGutterStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ShadowStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
@@ -59,7 +56,6 @@
 #include <LibWeb/CSS/StyleValues/TransitionStyleValue.h>
 #include <LibWeb/CSS/StyleValues/URLStyleValue.h>
 #include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
-#include <LibWeb/CSS/StyleValues/UnsetStyleValue.h>
 
 namespace Web::CSS {
 
@@ -218,18 +214,6 @@ ImageStyleValue const& CSSStyleValue::as_image() const
     return static_cast<ImageStyleValue const&>(*this);
 }
 
-InheritStyleValue const& CSSStyleValue::as_inherit() const
-{
-    VERIFY(is_inherit());
-    return static_cast<InheritStyleValue const&>(*this);
-}
-
-InitialStyleValue const& CSSStyleValue::as_initial() const
-{
-    VERIFY(is_initial());
-    return static_cast<InitialStyleValue const&>(*this);
-}
-
 IntegerStyleValue const& CSSStyleValue::as_integer() const
 {
     VERIFY(is_integer());
@@ -296,12 +280,6 @@ ResolutionStyleValue const& CSSStyleValue::as_resolution() const
     return static_cast<ResolutionStyleValue const&>(*this);
 }
 
-RevertStyleValue const& CSSStyleValue::as_revert() const
-{
-    VERIFY(is_revert());
-    return static_cast<RevertStyleValue const&>(*this);
-}
-
 ScrollbarGutterStyleValue const& CSSStyleValue::as_scrollbar_gutter() const
 {
     VERIFY(is_scrollbar_gutter());
@@ -350,12 +328,6 @@ UnresolvedStyleValue const& CSSStyleValue::as_unresolved() const
     return static_cast<UnresolvedStyleValue const&>(*this);
 }
 
-UnsetStyleValue const& CSSStyleValue::as_unset() const
-{
-    VERIFY(is_unset());
-    return static_cast<UnsetStyleValue const&>(*this);
-}
-
 URLStyleValue const& CSSStyleValue::as_url() const
 {
     VERIFY(is_url());
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleValue.h b/Userland/Libraries/LibWeb/CSS/CSSStyleValue.h
index c1151968c74..479ff2db64f 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleValue.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleValue.h
@@ -111,8 +111,6 @@ public:
         GridTrackPlacement,
         GridTrackSizeList,
         Image,
-        Inherit,
-        Initial,
         Integer,
         Keyword,
         Length,
@@ -125,7 +123,6 @@ public:
         Ratio,
         Rect,
         Resolution,
-        Revert,
         ScrollbarGutter,
         Shadow,
         Shorthand,
@@ -134,7 +131,6 @@ public:
         Transformation,
         Transition,
         Unresolved,
-        Unset,
         URL,
         ValueList,
     };
@@ -240,14 +236,6 @@ public:
     ImageStyleValue const& as_image() const;
     ImageStyleValue& as_image() { return const_cast<ImageStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_image()); }
 
-    bool is_inherit() const { return type() == Type::Inherit; }
-    InheritStyleValue const& as_inherit() const;
-    InheritStyleValue& as_inherit() { return const_cast<InheritStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_inherit()); }
-
-    bool is_initial() const { return type() == Type::Initial; }
-    InitialStyleValue const& as_initial() const;
-    InitialStyleValue& as_initial() { return const_cast<InitialStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_initial()); }
-
     bool is_integer() const { return type() == Type::Integer; }
     IntegerStyleValue const& as_integer() const;
     IntegerStyleValue& as_integer() { return const_cast<IntegerStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_integer()); }
@@ -296,10 +284,6 @@ public:
     ResolutionStyleValue const& as_resolution() const;
     ResolutionStyleValue& as_resolution() { return const_cast<ResolutionStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_resolution()); }
 
-    bool is_revert() const { return type() == Type::Revert; }
-    RevertStyleValue const& as_revert() const;
-    RevertStyleValue& as_revert() { return const_cast<RevertStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_revert()); }
-
     bool is_scrollbar_gutter() const { return type() == Type::ScrollbarGutter; }
     ScrollbarGutterStyleValue const& as_scrollbar_gutter() const;
     ScrollbarGutterStyleValue& as_scrollbar_gutter() { return const_cast<ScrollbarGutterStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_scrollbar_gutter()); }
@@ -332,10 +316,6 @@ public:
     UnresolvedStyleValue const& as_unresolved() const;
     UnresolvedStyleValue& as_unresolved() { return const_cast<UnresolvedStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_unresolved()); }
 
-    bool is_unset() const { return type() == Type::Unset; }
-    UnsetStyleValue const& as_unset() const;
-    UnsetStyleValue& as_unset() { return const_cast<UnsetStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_unset()); }
-
     bool is_url() const { return type() == Type::URL; }
     URLStyleValue const& as_url() const;
     URLStyleValue& as_url() { return const_cast<URLStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_url()); }
@@ -347,6 +327,10 @@ public:
     // https://www.w3.org/TR/css-values-4/#common-keywords
     // https://drafts.csswg.org/css-cascade-4/#valdef-all-revert
     bool is_css_wide_keyword() const { return is_inherit() || is_initial() || is_revert() || is_unset(); }
+    bool is_inherit() const { return to_keyword() == Keyword::Inherit; }
+    bool is_initial() const { return to_keyword() == Keyword::Initial; }
+    bool is_revert() const { return to_keyword() == Keyword::Revert; }
+    bool is_unset() const { return to_keyword() == Keyword::Unset; }
 
     bool has_auto() const;
     virtual bool has_color() const { return false; }
diff --git a/Userland/Libraries/LibWeb/CSS/Keywords.json b/Userland/Libraries/LibWeb/CSS/Keywords.json
index f8bb85149c2..f2f60c8d898 100644
--- a/Userland/Libraries/LibWeb/CSS/Keywords.json
+++ b/Userland/Libraries/LibWeb/CSS/Keywords.json
@@ -186,6 +186,8 @@
   "infinite",
   "infobackground",
   "infotext",
+  "inherit",
+  "initial",
   "initial-only",
   "inline",
   "inline-block",
@@ -290,6 +292,7 @@
   "repeat-x",
   "repeat-y",
   "reverse",
+  "revert",
   "ridge",
   "right",
   "round",
@@ -378,6 +381,7 @@
   "ultra-expanded",
   "underline",
   "unsafe",
+  "unset",
   "up",
   "upper-alpha",
   "upper-latin",
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index f6951318502..4ee9c6f0dde 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -59,8 +59,6 @@
 #include <LibWeb/CSS/StyleValues/GridTrackPlacementStyleValue.h>
 #include <LibWeb/CSS/StyleValues/GridTrackSizeListStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ImageStyleValue.h>
-#include <LibWeb/CSS/StyleValues/InheritStyleValue.h>
-#include <LibWeb/CSS/StyleValues/InitialStyleValue.h>
 #include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
 #include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
 #include <LibWeb/CSS/StyleValues/MathDepthStyleValue.h>
@@ -70,7 +68,6 @@
 #include <LibWeb/CSS/StyleValues/RatioStyleValue.h>
 #include <LibWeb/CSS/StyleValues/RectStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ResolutionStyleValue.h>
-#include <LibWeb/CSS/StyleValues/RevertStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ScrollbarGutterStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ShadowStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
@@ -81,7 +78,6 @@
 #include <LibWeb/CSS/StyleValues/TransitionStyleValue.h>
 #include <LibWeb/CSS/StyleValues/URLStyleValue.h>
 #include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
-#include <LibWeb/CSS/StyleValues/UnsetStyleValue.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/Infra/CharacterTypes.h>
 #include <LibWeb/Infra/Strings.h>
@@ -1626,19 +1622,19 @@ RefPtr<CSSStyleValue> Parser::parse_builtin_value(TokenStream<ComponentValue>& t
         auto ident = component_value.token().ident();
         if (ident.equals_ignoring_ascii_case("inherit"sv)) {
             transaction.commit();
-            return InheritStyleValue::the();
+            return CSSKeywordValue::create(Keyword::Inherit);
         }
         if (ident.equals_ignoring_ascii_case("initial"sv)) {
             transaction.commit();
-            return InitialStyleValue::the();
+            return CSSKeywordValue::create(Keyword::Initial);
         }
         if (ident.equals_ignoring_ascii_case("unset"sv)) {
             transaction.commit();
-            return UnsetStyleValue::the();
+            return CSSKeywordValue::create(Keyword::Unset);
         }
         if (ident.equals_ignoring_ascii_case("revert"sv)) {
             transaction.commit();
-            return RevertStyleValue::the();
+            return CSSKeywordValue::create(Keyword::Revert);
         }
         // FIXME: Implement `revert-layer` from CSS-CASCADE-5.
     }
@@ -7947,18 +7943,18 @@ NonnullRefPtr<CSSStyleValue> Parser::resolve_unresolved_style_value(DOM::Element
 
     HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>> dependencies;
     if (!expand_variables(element, pseudo_element, string_from_property_id(property_id), dependencies, unresolved_values_without_variables_expanded, values_with_variables_expanded))
-        return UnsetStyleValue::the();
+        return CSSKeywordValue::create(Keyword::Unset);
 
     TokenStream unresolved_values_with_variables_expanded { values_with_variables_expanded };
     Vector<ComponentValue> expanded_values;
     if (!expand_unresolved_values(element, string_from_property_id(property_id), unresolved_values_with_variables_expanded, expanded_values))
-        return UnsetStyleValue::the();
+        return CSSKeywordValue::create(Keyword::Unset);
 
     auto expanded_value_tokens = TokenStream { expanded_values };
     if (auto parsed_value = parse_css_value(property_id, expanded_value_tokens); !parsed_value.is_error())
         return parsed_value.release_value();
 
-    return UnsetStyleValue::the();
+    return CSSKeywordValue::create(Keyword::Unset);
 }
 
 static RefPtr<CSSStyleValue const> get_custom_property(DOM::Element const& element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, FlyString const& custom_property_name)
diff --git a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
index dfa109087fc..01dcffb0040 100644
--- a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
+++ b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
@@ -21,7 +21,6 @@
 #include <LibWeb/CSS/StyleValues/EdgeStyleValue.h>
 #include <LibWeb/CSS/StyleValues/GridTrackPlacementStyleValue.h>
 #include <LibWeb/CSS/StyleValues/GridTrackSizeListStyleValue.h>
-#include <LibWeb/CSS/StyleValues/InitialStyleValue.h>
 #include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
 #include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
 #include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
diff --git a/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp b/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
index 24a5f3581fd..4a479544e75 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
@@ -61,7 +61,6 @@
 #include <LibWeb/CSS/StyleValues/TransformationStyleValue.h>
 #include <LibWeb/CSS/StyleValues/TransitionStyleValue.h>
 #include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
-#include <LibWeb/CSS/StyleValues/UnsetStyleValue.h>
 #include <LibWeb/DOM/Attr.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Element.h>
@@ -1869,7 +1868,7 @@ NonnullRefPtr<CSSStyleValue const> StyleComputer::get_inherit_value(JS::Realm& i
 
 void StyleComputer::compute_defaulted_property_value(StyleProperties& style, DOM::Element const* element, CSS::PropertyID property_id, Optional<CSS::Selector::PseudoElement::Type> pseudo_element) const
 {
-    // FIXME: If we don't know the correct initial value for a property, we fall back to InitialStyleValue.
+    // FIXME: If we don't know the correct initial value for a property, we fall back to `initial`.
 
     auto& value_slot = style.m_property_values[to_underlying(property_id)];
     if (!value_slot) {
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/CSSKeywordValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/CSSKeywordValue.h
index be9eefbbe3b..099fb7ea1f9 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValues/CSSKeywordValue.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleValues/CSSKeywordValue.h
@@ -15,11 +15,31 @@
 namespace Web::CSS {
 
 // https://drafts.css-houdini.org/css-typed-om-1/#csskeywordvalue
-class CSSKeywordValue final : public StyleValueWithDefaultOperators<CSSKeywordValue> {
+class CSSKeywordValue : public StyleValueWithDefaultOperators<CSSKeywordValue> {
 public:
     static ValueComparingNonnullRefPtr<CSSKeywordValue> create(Keyword keyword)
     {
-        return adopt_ref(*new (nothrow) CSSKeywordValue(keyword));
+        // NOTE: We'll have to be much more careful with caching once we expose CSSKeywordValue to JS, as it's mutable.
+        switch (keyword) {
+        case Keyword::Inherit: {
+            static ValueComparingNonnullRefPtr<CSSKeywordValue> const inherit_instance = adopt_ref(*new (nothrow) CSSKeywordValue(Keyword::Inherit));
+            return inherit_instance;
+        }
+        case Keyword::Initial: {
+            static ValueComparingNonnullRefPtr<CSSKeywordValue> const initial_instance = adopt_ref(*new (nothrow) CSSKeywordValue(Keyword::Initial));
+            return initial_instance;
+        }
+        case Keyword::Revert: {
+            static ValueComparingNonnullRefPtr<CSSKeywordValue> const revert_instance = adopt_ref(*new (nothrow) CSSKeywordValue(Keyword::Revert));
+            return revert_instance;
+        }
+        case Keyword::Unset: {
+            static ValueComparingNonnullRefPtr<CSSKeywordValue> const unset_instance = adopt_ref(*new (nothrow) CSSKeywordValue(Keyword::Unset));
+            return unset_instance;
+        }
+        default:
+            return adopt_ref(*new (nothrow) CSSKeywordValue(keyword));
+        }
     }
     virtual ~CSSKeywordValue() override = default;
 
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/InheritStyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/InheritStyleValue.h
deleted file mode 100644
index 35b0c8f9779..00000000000
--- a/Userland/Libraries/LibWeb/CSS/StyleValues/InheritStyleValue.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#pragma once
-
-#include <LibWeb/CSS/CSSStyleValue.h>
-
-namespace Web::CSS {
-
-class InheritStyleValue final : public StyleValueWithDefaultOperators<InheritStyleValue> {
-public:
-    static ValueComparingNonnullRefPtr<InheritStyleValue> the()
-    {
-        static ValueComparingNonnullRefPtr<InheritStyleValue> instance = adopt_ref(*new (nothrow) InheritStyleValue);
-        return instance;
-    }
-    virtual ~InheritStyleValue() override = default;
-
-    String to_string() const override { return "inherit"_string; }
-
-    bool properties_equal(InheritStyleValue const&) const { return true; }
-
-private:
-    InheritStyleValue()
-        : StyleValueWithDefaultOperators(Type::Inherit)
-    {
-    }
-};
-
-}
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/InitialStyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/InitialStyleValue.h
deleted file mode 100644
index ac81e73d443..00000000000
--- a/Userland/Libraries/LibWeb/CSS/StyleValues/InitialStyleValue.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#pragma once
-
-#include <LibWeb/CSS/CSSStyleValue.h>
-
-namespace Web::CSS {
-
-class InitialStyleValue final : public StyleValueWithDefaultOperators<InitialStyleValue> {
-public:
-    static ValueComparingNonnullRefPtr<InitialStyleValue> the()
-    {
-        static ValueComparingNonnullRefPtr<InitialStyleValue> instance = adopt_ref(*new (nothrow) InitialStyleValue);
-        return instance;
-    }
-    virtual ~InitialStyleValue() override = default;
-
-    String to_string() const override { return "initial"_string; }
-
-    bool properties_equal(InitialStyleValue const&) const { return true; }
-
-private:
-    InitialStyleValue()
-        : StyleValueWithDefaultOperators(Type::Initial)
-    {
-    }
-};
-
-}
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/RevertStyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/RevertStyleValue.h
deleted file mode 100644
index 6bb5998b7b2..00000000000
--- a/Userland/Libraries/LibWeb/CSS/StyleValues/RevertStyleValue.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#pragma once
-
-#include <LibWeb/CSS/CSSStyleValue.h>
-
-namespace Web::CSS {
-
-class RevertStyleValue final : public StyleValueWithDefaultOperators<RevertStyleValue> {
-public:
-    static ValueComparingNonnullRefPtr<RevertStyleValue> the()
-    {
-        static ValueComparingNonnullRefPtr<RevertStyleValue> instance = adopt_ref(*new (nothrow) RevertStyleValue);
-        return instance;
-    }
-    virtual ~RevertStyleValue() override = default;
-
-    String to_string() const override { return "revert"_string; }
-
-    bool properties_equal(RevertStyleValue const&) const { return true; }
-
-private:
-    RevertStyleValue()
-        : StyleValueWithDefaultOperators(Type::Revert)
-    {
-    }
-};
-
-}
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/UnsetStyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/UnsetStyleValue.h
deleted file mode 100644
index 977ded9dd91..00000000000
--- a/Userland/Libraries/LibWeb/CSS/StyleValues/UnsetStyleValue.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
- * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
- * Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#pragma once
-
-#include <LibWeb/CSS/CSSStyleValue.h>
-
-namespace Web::CSS {
-
-class UnsetStyleValue final : public StyleValueWithDefaultOperators<UnsetStyleValue> {
-public:
-    static ValueComparingNonnullRefPtr<UnsetStyleValue> the()
-    {
-        static ValueComparingNonnullRefPtr<UnsetStyleValue> instance = adopt_ref(*new (nothrow) UnsetStyleValue);
-        return instance;
-    }
-    virtual ~UnsetStyleValue() override = default;
-
-    String to_string() const override { return "unset"_string; }
-
-    bool properties_equal(UnsetStyleValue const&) const { return true; }
-
-private:
-    UnsetStyleValue()
-        : StyleValueWithDefaultOperators(Type::Unset)
-    {
-    }
-};
-
-}
diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 4863e52d9c4..1404cad5add 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -152,8 +152,6 @@ class GridTrackPlacementStyleValue;
 class GridTrackSizeList;
 class GridTrackSizeListStyleValue;
 class ImageStyleValue;
-class InheritStyleValue;
-class InitialStyleValue;
 class IntegerOrCalculated;
 class IntegerStyleValue;
 class Length;
@@ -184,7 +182,6 @@ class RectStyleValue;
 class Resolution;
 class ResolutionOrCalculated;
 class ResolutionStyleValue;
-class RevertStyleValue;
 class Screen;
 class ScreenOrientation;
 class ScrollbarGutterStyleValue;
@@ -209,7 +206,6 @@ class TransformationStyleValue;
 class TransitionStyleValue;
 class URLStyleValue;
 class UnresolvedStyleValue;
-class UnsetStyleValue;
 class VisualViewport;
 
 enum class Keyword;