diff --git a/Libraries/LibWeb/Animations/AnimationEffect.cpp b/Libraries/LibWeb/Animations/AnimationEffect.cpp
index c089e6ef0c..cdd20ba039 100644
--- a/Libraries/LibWeb/Animations/AnimationEffect.cpp
+++ b/Libraries/LibWeb/Animations/AnimationEffect.cpp
@@ -13,6 +13,7 @@
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/CSS/ComputedProperties.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleComputer.h>
 #include <LibWeb/CSS/StyleInvalidation.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
diff --git a/Libraries/LibWeb/Animations/KeyframeEffect.cpp b/Libraries/LibWeb/Animations/KeyframeEffect.cpp
index 47af1ee7aa..ffd7d6f7a6 100644
--- a/Libraries/LibWeb/Animations/KeyframeEffect.cpp
+++ b/Libraries/LibWeb/Animations/KeyframeEffect.cpp
@@ -13,6 +13,7 @@
 #include <LibWeb/Bindings/KeyframeEffectPrototype.h>
 #include <LibWeb/CSS/ComputedProperties.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleComputer.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/DOM/AbstractElement.h>
diff --git a/Libraries/LibWeb/Animations/KeyframeEffect.h b/Libraries/LibWeb/Animations/KeyframeEffect.h
index f3dabd19cd..5d08b6d09d 100644
--- a/Libraries/LibWeb/Animations/KeyframeEffect.h
+++ b/Libraries/LibWeb/Animations/KeyframeEffect.h
@@ -11,7 +11,6 @@
 #include <LibWeb/Animations/AnimationEffect.h>
 #include <LibWeb/Bindings/KeyframeEffectPrototype.h>
 #include <LibWeb/Bindings/PlatformObject.h>
-#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/Selector.h>
 #include <LibWeb/CSS/StyleValues/StyleValue.h>
 
diff --git a/Libraries/LibWeb/CSS/AcceptedTypeRange.h b/Libraries/LibWeb/CSS/AcceptedTypeRange.h
new file mode 100644
index 0000000000..9b189a94c1
--- /dev/null
+++ b/Libraries/LibWeb/CSS/AcceptedTypeRange.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2025, Callum Law <callumlaw1709@outlook.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/Forward.h>
+
+namespace Web::CSS {
+
+struct AcceptedTypeRange {
+    float min;
+    float max;
+};
+using AcceptedTypeRangeMap = HashMap<ValueType, AcceptedTypeRange>;
+
+}
diff --git a/Libraries/LibWeb/CSS/CSSAnimation.h b/Libraries/LibWeb/CSS/CSSAnimation.h
index ebe374f40f..fbc2da7512 100644
--- a/Libraries/LibWeb/CSS/CSSAnimation.h
+++ b/Libraries/LibWeb/CSS/CSSAnimation.h
@@ -7,7 +7,6 @@
 #pragma once
 
 #include <LibWeb/Animations/Animation.h>
-#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleValues/StyleValue.h>
 
 namespace Web::CSS {
diff --git a/Libraries/LibWeb/CSS/CSSDescriptors.cpp b/Libraries/LibWeb/CSS/CSSDescriptors.cpp
index e1075c7c84..3668c94321 100644
--- a/Libraries/LibWeb/CSS/CSSDescriptors.cpp
+++ b/Libraries/LibWeb/CSS/CSSDescriptors.cpp
@@ -6,6 +6,7 @@
 
 #include <LibWeb/CSS/CSSDescriptors.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/Serialize.h>
 #include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
 #include <LibWeb/Infra/Strings.h>
diff --git a/Libraries/LibWeb/CSS/CSSTransition.cpp b/Libraries/LibWeb/CSS/CSSTransition.cpp
index 82a94f3172..22f8f05498 100644
--- a/Libraries/LibWeb/CSS/CSSTransition.cpp
+++ b/Libraries/LibWeb/CSS/CSSTransition.cpp
@@ -11,6 +11,7 @@
 #include <LibWeb/CSS/CSSStyleDeclaration.h>
 #include <LibWeb/CSS/CSSTransition.h>
 #include <LibWeb/CSS/Interpolation.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Element.h>
 #include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
@@ -27,6 +28,11 @@ GC::Ref<CSSTransition> CSSTransition::start_a_transition(DOM::AbstractElement ab
     return realm.create<CSSTransition>(realm, abstract_element, property_id, transition_generation, delay, start_time, end_time, start_value, end_value, reversing_adjusted_start_value, reversing_shortening_factor);
 }
 
+StringView CSSTransition::transition_property() const
+{
+    return string_from_property_id(m_transition_property);
+}
+
 Animations::AnimationClass CSSTransition::animation_class() const
 {
     return Animations::AnimationClass::CSSTransition;
diff --git a/Libraries/LibWeb/CSS/CSSTransition.h b/Libraries/LibWeb/CSS/CSSTransition.h
index 9361dabad9..c41444878a 100644
--- a/Libraries/LibWeb/CSS/CSSTransition.h
+++ b/Libraries/LibWeb/CSS/CSSTransition.h
@@ -9,7 +9,6 @@
 
 #include <LibWeb/Animations/Animation.h>
 #include <LibWeb/CSS/Interpolation.h>
-#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/PseudoElement.h>
 #include <LibWeb/CSS/StyleValues/StyleValue.h>
 #include <LibWeb/CSS/Time.h>
@@ -25,7 +24,7 @@ public:
         size_t transition_generation, double delay, double start_time, double end_time, NonnullRefPtr<StyleValue const> start_value,
         NonnullRefPtr<StyleValue const> end_value, NonnullRefPtr<StyleValue const> reversing_adjusted_start_value, double reversing_shortening_factor);
 
-    StringView transition_property() const { return string_from_property_id(m_transition_property); }
+    StringView transition_property() const;
 
     virtual Animations::AnimationClass animation_class() const override;
     virtual Optional<int> class_specific_composite_order(GC::Ref<Animations::Animation> other) const override;
diff --git a/Libraries/LibWeb/CSS/CascadedProperties.cpp b/Libraries/LibWeb/CSS/CascadedProperties.cpp
index 5401b056e9..c4fdb3993f 100644
--- a/Libraries/LibWeb/CSS/CascadedProperties.cpp
+++ b/Libraries/LibWeb/CSS/CascadedProperties.cpp
@@ -7,6 +7,7 @@
 #include <LibWeb/CSS/CSSStyleDeclaration.h>
 #include <LibWeb/CSS/CascadedProperties.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/PropertyNameAndID.h>
 #include <LibWeb/CSS/StyleComputer.h>
 #include <LibWeb/DOM/Element.h>
diff --git a/Libraries/LibWeb/CSS/CascadedProperties.h b/Libraries/LibWeb/CSS/CascadedProperties.h
index bd84ea1825..0e00be07e8 100644
--- a/Libraries/LibWeb/CSS/CascadedProperties.h
+++ b/Libraries/LibWeb/CSS/CascadedProperties.h
@@ -9,7 +9,6 @@
 #include <LibGC/CellAllocator.h>
 #include <LibJS/Heap/Cell.h>
 #include <LibWeb/CSS/CascadeOrigin.h>
-#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/Selector.h>
 #include <LibWeb/CSS/StyleProperty.h>
 #include <LibWeb/CSS/StyleValues/StyleValue.h>
diff --git a/Libraries/LibWeb/CSS/FontFaceSet.cpp b/Libraries/LibWeb/CSS/FontFaceSet.cpp
index 5377398207..11f10dd448 100644
--- a/Libraries/LibWeb/CSS/FontFaceSet.cpp
+++ b/Libraries/LibWeb/CSS/FontFaceSet.cpp
@@ -14,6 +14,7 @@
 #include <LibWeb/CSS/FontFace.h>
 #include <LibWeb/CSS/FontFaceSet.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
 #include <LibWeb/CSS/StyleValues/StringStyleValue.h>
diff --git a/Libraries/LibWeb/CSS/NumericType.h b/Libraries/LibWeb/CSS/NumericType.h
index a5c826fb4b..871bc94298 100644
--- a/Libraries/LibWeb/CSS/NumericType.h
+++ b/Libraries/LibWeb/CSS/NumericType.h
@@ -9,7 +9,7 @@
 #include <AK/Array.h>
 #include <AK/Optional.h>
 #include <AK/String.h>
-#include <LibWeb/CSS/PropertyID.h>
+#include <LibWeb/Forward.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/CSS/Parser/Parser.h b/Libraries/LibWeb/CSS/Parser/Parser.h
index d45f34cc3e..a86c64b545 100644
--- a/Libraries/LibWeb/CSS/Parser/Parser.h
+++ b/Libraries/LibWeb/CSS/Parser/Parser.h
@@ -26,7 +26,6 @@
 #include <LibWeb/CSS/Parser/TokenStream.h>
 #include <LibWeb/CSS/Parser/Tokenizer.h>
 #include <LibWeb/CSS/Parser/Types.h>
-#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/Ratio.h>
 #include <LibWeb/CSS/Selector.h>
 #include <LibWeb/CSS/StyleValues/AbstractImageStyleValue.h>
diff --git a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
index da689a0081..0303556e74 100644
--- a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
+++ b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
@@ -18,6 +18,7 @@
 #include <LibWeb/CSS/CharacterTypes.h>
 #include <LibWeb/CSS/Parser/ErrorReporter.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleValues/AngleStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BackgroundSizeStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderImageSliceStyleValue.h>
@@ -61,6 +62,7 @@
 #include <LibWeb/CSS/StyleValues/TransformationStyleValue.h>
 #include <LibWeb/CSS/StyleValues/URLStyleValue.h>
 #include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
+#include <LibWeb/CSS/ValueType.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/Infra/Strings.h>
 
diff --git a/Libraries/LibWeb/CSS/Parser/Syntax.cpp b/Libraries/LibWeb/CSS/Parser/Syntax.cpp
index 76808abca9..f257ad7678 100644
--- a/Libraries/LibWeb/CSS/Parser/Syntax.cpp
+++ b/Libraries/LibWeb/CSS/Parser/Syntax.cpp
@@ -6,6 +6,7 @@
 
 #include <LibWeb/CSS/Parser/Syntax.h>
 #include <LibWeb/CSS/Serialize.h>
+#include <LibWeb/CSS/ValueType.h>
 
 namespace Web::CSS::Parser {
 
diff --git a/Libraries/LibWeb/CSS/Parser/Syntax.h b/Libraries/LibWeb/CSS/Parser/Syntax.h
index 6606a3f48a..e1b47f0d8d 100644
--- a/Libraries/LibWeb/CSS/Parser/Syntax.h
+++ b/Libraries/LibWeb/CSS/Parser/Syntax.h
@@ -10,8 +10,8 @@
 #include <AK/NonnullOwnPtr.h>
 #include <AK/OwnPtr.h>
 #include <AK/String.h>
-#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/Export.h>
+#include <LibWeb/Forward.h>
 
 namespace Web::CSS::Parser {
 
diff --git a/Libraries/LibWeb/CSS/Parser/SyntaxParsing.cpp b/Libraries/LibWeb/CSS/Parser/SyntaxParsing.cpp
index 9539284fc8..9f9ecea263 100644
--- a/Libraries/LibWeb/CSS/Parser/SyntaxParsing.cpp
+++ b/Libraries/LibWeb/CSS/Parser/SyntaxParsing.cpp
@@ -16,6 +16,7 @@
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/CSS/StyleValues/StyleValueList.h>
 #include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
+#include <LibWeb/CSS/ValueType.h>
 
 namespace Web::CSS::Parser {
 
diff --git a/Libraries/LibWeb/CSS/PropertyNameAndID.h b/Libraries/LibWeb/CSS/PropertyNameAndID.h
index 6face41697..6aad9893e7 100644
--- a/Libraries/LibWeb/CSS/PropertyNameAndID.h
+++ b/Libraries/LibWeb/CSS/PropertyNameAndID.h
@@ -8,7 +8,6 @@
 
 #include <AK/FlyString.h>
 #include <AK/Optional.h>
-#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/PropertyName.h>
 #include <LibWeb/CSS/Serialize.h>
 
diff --git a/Libraries/LibWeb/CSS/StyleInvalidation.cpp b/Libraries/LibWeb/CSS/StyleInvalidation.cpp
index 2e2ce9e4e5..f5a85e1f1a 100644
--- a/Libraries/LibWeb/CSS/StyleInvalidation.cpp
+++ b/Libraries/LibWeb/CSS/StyleInvalidation.cpp
@@ -5,6 +5,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleInvalidation.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
diff --git a/Libraries/LibWeb/CSS/StyleInvalidation.h b/Libraries/LibWeb/CSS/StyleInvalidation.h
index 3efeeb7afb..3fa361ca4a 100644
--- a/Libraries/LibWeb/CSS/StyleInvalidation.h
+++ b/Libraries/LibWeb/CSS/StyleInvalidation.h
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#include <LibWeb/CSS/PropertyID.h>
+#include <LibWeb/Forward.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/CSS/StyleProperty.h b/Libraries/LibWeb/CSS/StyleProperty.h
index 11835a77f5..f9cef1c9af 100644
--- a/Libraries/LibWeb/CSS/StyleProperty.h
+++ b/Libraries/LibWeb/CSS/StyleProperty.h
@@ -7,7 +7,7 @@
 #pragma once
 
 #include <AK/FlyString.h>
-#include <LibWeb/CSS/PropertyID.h>
+#include <LibWeb/Forward.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h b/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h
index 0f687a9b3a..0a6b2f9f21 100644
--- a/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h
+++ b/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h
@@ -10,6 +10,7 @@
 #pragma once
 
 #include <AK/Function.h>
+#include <LibWeb/CSS/AcceptedTypeRange.h>
 #include <LibWeb/CSS/Angle.h>
 #include <LibWeb/CSS/Enums.h>
 #include <LibWeb/CSS/Flex.h>
diff --git a/Libraries/LibWeb/CSS/StyleValues/IntegerStyleValue.cpp b/Libraries/LibWeb/CSS/StyleValues/IntegerStyleValue.cpp
index be266d0926..47702a69bd 100644
--- a/Libraries/LibWeb/CSS/StyleValues/IntegerStyleValue.cpp
+++ b/Libraries/LibWeb/CSS/StyleValues/IntegerStyleValue.cpp
@@ -7,6 +7,7 @@
 #include "IntegerStyleValue.h"
 #include <LibWeb/CSS/CSSUnitValue.h>
 #include <LibWeb/CSS/Parser/ComponentValue.h>
+#include <LibWeb/CSS/PropertyID.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/CSS/StyleValues/NumberStyleValue.cpp b/Libraries/LibWeb/CSS/StyleValues/NumberStyleValue.cpp
index 086ccb9cd4..ff287246b3 100644
--- a/Libraries/LibWeb/CSS/StyleValues/NumberStyleValue.cpp
+++ b/Libraries/LibWeb/CSS/StyleValues/NumberStyleValue.cpp
@@ -10,7 +10,9 @@
 #include "NumberStyleValue.h"
 #include <LibWeb/CSS/CSSUnitValue.h>
 #include <LibWeb/CSS/Parser/ComponentValue.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/Serialize.h>
+#include <LibWeb/CSS/ValueType.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/CSS/StyleValues/TransformationStyleValue.cpp b/Libraries/LibWeb/CSS/StyleValues/TransformationStyleValue.cpp
index de72221152..e2a7c0a837 100644
--- a/Libraries/LibWeb/CSS/StyleValues/TransformationStyleValue.cpp
+++ b/Libraries/LibWeb/CSS/StyleValues/TransformationStyleValue.cpp
@@ -20,6 +20,7 @@
 #include <LibWeb/CSS/CSSTransformComponent.h>
 #include <LibWeb/CSS/CSSTranslate.h>
 #include <LibWeb/CSS/CSSUnitValue.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/Serialize.h>
 #include <LibWeb/CSS/StyleValues/AngleStyleValue.h>
 #include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
diff --git a/Libraries/LibWeb/Editing/Commands.cpp b/Libraries/LibWeb/Editing/Commands.cpp
index acda937ad7..ce32c54605 100644
--- a/Libraries/LibWeb/Editing/Commands.cpp
+++ b/Libraries/LibWeb/Editing/Commands.cpp
@@ -6,6 +6,7 @@
 
 #include <LibUnicode/CharacterTypes.h>
 #include <LibUnicode/Segmenter.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/DOM/Comment.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/DocumentFragment.h>
diff --git a/Libraries/LibWeb/Forward.h b/Libraries/LibWeb/Forward.h
index 2e34df39b1..b91bd95d8b 100644
--- a/Libraries/LibWeb/Forward.h
+++ b/Libraries/LibWeb/Forward.h
@@ -395,12 +395,14 @@ enum class Keyword : u16;
 enum class MediaFeatureID : u8;
 enum class PropertyID : u16;
 enum class PaintOrder : u8;
+enum class ValueType : u8;
 
 struct BackgroundLayerData;
 struct CalculationContext;
 struct CalculationResolutionContext;
 struct CSSStyleSheetInit;
 struct GridRepeatParams;
+struct LogicalAliasMappingContext;
 struct StyleSheetIdentifier;
 
 using PaintOrderList = Array<PaintOrder, 3>;
diff --git a/Libraries/LibWeb/HTML/Canvas/CanvasFillStrokeStyles.cpp b/Libraries/LibWeb/HTML/Canvas/CanvasFillStrokeStyles.cpp
index 7af72f5c1e..fdabc47e8b 100644
--- a/Libraries/LibWeb/HTML/Canvas/CanvasFillStrokeStyles.cpp
+++ b/Libraries/LibWeb/HTML/Canvas/CanvasFillStrokeStyles.cpp
@@ -11,6 +11,7 @@
 #include "CanvasFillStrokeStyles.h"
 #include <AK/String.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/HTML/CanvasGradient.h>
 #include <LibWeb/HTML/CanvasPattern.h>
 #include <LibWeb/HTML/CanvasRenderingContext2D.h>
diff --git a/Libraries/LibWeb/HTML/CanvasGradient.cpp b/Libraries/LibWeb/HTML/CanvasGradient.cpp
index 41bb213376..168b527ef4 100644
--- a/Libraries/LibWeb/HTML/CanvasGradient.cpp
+++ b/Libraries/LibWeb/HTML/CanvasGradient.cpp
@@ -9,6 +9,7 @@
 #include <LibWeb/Bindings/CanvasGradientPrototype.h>
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/HTML/CanvasGradient.h>
 #include <LibWeb/WebIDL/ExceptionOr.h>
 
diff --git a/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp b/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
index 17f1a6b239..f9c401b5e5 100644
--- a/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
+++ b/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
@@ -18,6 +18,7 @@
 #include <LibUnicode/Segmenter.h>
 #include <LibWeb/Bindings/CanvasRenderingContext2DPrototype.h>
 #include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/HTML/CanvasRenderingContext2D.h>
 #include <LibWeb/HTML/HTMLCanvasElement.h>
 #include <LibWeb/HTML/HTMLImageElement.h>
diff --git a/Libraries/LibWeb/HTML/HTMLLIElement.cpp b/Libraries/LibWeb/HTML/HTMLLIElement.cpp
index ea28d0b9ee..dde08a0a7b 100644
--- a/Libraries/LibWeb/HTML/HTMLLIElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLLIElement.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <LibWeb/Bindings/HTMLLIElementPrototype.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/HTML/HTMLLIElement.h>
 #include <LibWeb/HTML/Numbers.h>
diff --git a/Libraries/LibWeb/HTML/HTMLOListElement.cpp b/Libraries/LibWeb/HTML/HTMLOListElement.cpp
index a8c3f29882..03e8e2599a 100644
--- a/Libraries/LibWeb/HTML/HTMLOListElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLOListElement.cpp
@@ -6,6 +6,7 @@
 
 #include <LibWeb/Bindings/HTMLOListElementPrototype.h>
 #include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/AttributeNames.h>
diff --git a/Libraries/LibWeb/HTML/HTMLUListElement.cpp b/Libraries/LibWeb/HTML/HTMLUListElement.cpp
index 769118f114..89daffc5e7 100644
--- a/Libraries/LibWeb/HTML/HTMLUListElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLUListElement.cpp
@@ -6,6 +6,7 @@
 
 #include <LibWeb/Bindings/HTMLUListElementPrototype.h>
 #include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/HTML/HTMLUListElement.h>
 
diff --git a/Libraries/LibWeb/HTML/OffscreenCanvasRenderingContext2D.cpp b/Libraries/LibWeb/HTML/OffscreenCanvasRenderingContext2D.cpp
index 30a7998594..f44d65c456 100644
--- a/Libraries/LibWeb/HTML/OffscreenCanvasRenderingContext2D.cpp
+++ b/Libraries/LibWeb/HTML/OffscreenCanvasRenderingContext2D.cpp
@@ -11,6 +11,7 @@
 #include <LibUnicode/Segmenter.h>
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/Bindings/OffscreenCanvasRenderingContext2DPrototype.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/HTML/HTMLCanvasElement.h>
 #include <LibWeb/HTML/HTMLImageElement.h>
 #include <LibWeb/HTML/ImageBitmap.h>
diff --git a/Libraries/LibWeb/MathML/MathMLElement.cpp b/Libraries/LibWeb/MathML/MathMLElement.cpp
index b83f3209a9..a3a640a161 100644
--- a/Libraries/LibWeb/MathML/MathMLElement.cpp
+++ b/Libraries/LibWeb/MathML/MathMLElement.cpp
@@ -7,6 +7,7 @@
 #include <LibWeb/Bindings/ExceptionOrUtils.h>
 #include <LibWeb/Bindings/MathMLElementPrototype.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/CSS/StyleValues/MathDepthStyleValue.h>
diff --git a/Libraries/LibWeb/MathML/MathMLMiElement.cpp b/Libraries/LibWeb/MathML/MathMLMiElement.cpp
index 3ca53d9c04..30f177060b 100644
--- a/Libraries/LibWeb/MathML/MathMLMiElement.cpp
+++ b/Libraries/LibWeb/MathML/MathMLMiElement.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleValues/KeywordStyleValue.h>
 #include <LibWeb/HTML/Parser/HTMLParser.h>
 #include <LibWeb/MathML/AttributeNames.h>
diff --git a/Libraries/LibWeb/MathML/MathMLMspaceElement.cpp b/Libraries/LibWeb/MathML/MathMLMspaceElement.cpp
index 3863bc4a97..3447eab617 100644
--- a/Libraries/LibWeb/MathML/MathMLMspaceElement.cpp
+++ b/Libraries/LibWeb/MathML/MathMLMspaceElement.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/HTML/Parser/HTMLParser.h>
 #include <LibWeb/MathML/AttributeNames.h>
 #include <LibWeb/MathML/MathMLMspaceElement.h>
diff --git a/Libraries/LibWeb/SVG/SVGCircleElement.cpp b/Libraries/LibWeb/SVG/SVGCircleElement.cpp
index 4203f553ee..3aaabdd65b 100644
--- a/Libraries/LibWeb/SVG/SVGCircleElement.cpp
+++ b/Libraries/LibWeb/SVG/SVGCircleElement.cpp
@@ -8,6 +8,7 @@
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/Bindings/SVGCircleElementPrototype.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/Layout/Node.h>
 #include <LibWeb/SVG/AttributeNames.h>
 #include <LibWeb/SVG/AttributeParser.h>
diff --git a/Libraries/LibWeb/SVG/SVGFilterElement.cpp b/Libraries/LibWeb/SVG/SVGFilterElement.cpp
index 76695d2df8..b172614ce4 100644
--- a/Libraries/LibWeb/SVG/SVGFilterElement.cpp
+++ b/Libraries/LibWeb/SVG/SVGFilterElement.cpp
@@ -9,6 +9,7 @@
 #include <LibGfx/ImmutableBitmap.h>
 #include <LibWeb/Bindings/SVGFilterElementPrototype.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/DOM/Text.h>
 #include <LibWeb/Layout/Node.h>
 #include <LibWeb/Painting/PaintableBox.h>
diff --git a/Libraries/LibWeb/SVG/SVGFilterPrimitiveStandardAttributes.cpp b/Libraries/LibWeb/SVG/SVGFilterPrimitiveStandardAttributes.cpp
index 95fcd80a68..f694eb071d 100644
--- a/Libraries/LibWeb/SVG/SVGFilterPrimitiveStandardAttributes.cpp
+++ b/Libraries/LibWeb/SVG/SVGFilterPrimitiveStandardAttributes.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SVGFilterPrimitiveStandardAttributes.h"
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/SVG/SVGFEBlendElement.h>
 #include <LibWeb/SVG/SVGFEColorMatrixElement.h>
 #include <LibWeb/SVG/SVGFECompositeElement.h>
diff --git a/Libraries/LibWeb/SVG/SVGSVGElement.cpp b/Libraries/LibWeb/SVG/SVGSVGElement.cpp
index f8421acaa7..e709480a52 100644
--- a/Libraries/LibWeb/SVG/SVGSVGElement.cpp
+++ b/Libraries/LibWeb/SVG/SVGSVGElement.cpp
@@ -7,6 +7,7 @@
 
 #include <LibWeb/Bindings/SVGSVGElementPrototype.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 #include <LibWeb/CSS/StyleComputer.h>
 #include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
 #include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSDescriptors.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSDescriptors.cpp
index a2ce1c6abb..e01747998e 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSDescriptors.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSDescriptors.cpp
@@ -82,8 +82,7 @@ ErrorOr<void> generate_header_file(JsonObject const& at_rules_data, Core::File&
 #include <AK/FlyString.h>
 #include <AK/Optional.h>
 #include <AK/Types.h>
-#include <LibWeb/CSS/Keyword.h>
-#include <LibWeb/CSS/PropertyID.h>
+#include <LibWeb/Forward.h>
 
 namespace Web::CSS {
 
@@ -152,6 +151,7 @@ ErrorOr<void> generate_implementation_file(JsonObject const& at_rules_data, Core
 #include <LibWeb/CSS/DescriptorID.h>
 #include <LibWeb/CSS/StyleValues/StyleValue.h>
 #include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/CSS/PropertyID.h>
 
 namespace Web::CSS {
 
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
index 910c553f4f..35ac732129 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPropertyID.cpp
@@ -164,6 +164,7 @@ ErrorOr<void> generate_header_file(JsonObject& properties, JsonObject& logical_p
 #include <AK/Traits.h>
 #include <AK/Variant.h>
 #include <LibJS/Forward.h>
+#include <LibWeb/CSS/AcceptedTypeRange.h>
 #include <LibWeb/CSS/Enums.h>
 #include <LibWeb/CSS/ValueType.h>
 #include <LibWeb/Export.h>
@@ -259,11 +260,6 @@ bool property_is_single_valued(PropertyID);
 bool property_is_list_valued(PropertyID);
 
 bool property_accepts_type(PropertyID, ValueType);
-struct AcceptedTypeRange {
-    float min;
-    float max;
-};
-using AcceptedTypeRangeMap = HashMap<ValueType, AcceptedTypeRange>;
 AcceptedTypeRangeMap property_accepted_type_ranges(PropertyID);
 bool property_accepts_keyword(PropertyID, Keyword);
 Optional<Keyword> resolve_legacy_value_alias(PropertyID, Keyword);
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoElement.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoElement.cpp
index dc73497cb5..0c60004969 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoElement.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoElement.cpp
@@ -58,7 +58,7 @@ ErrorOr<void> generate_header_file(JsonObject& pseudo_elements_data, Core::File&
 
 #include <AK/Optional.h>
 #include <AK/StringView.h>
-#include <LibWeb/CSS/PropertyID.h>
+#include <LibWeb/Forward.h>
 #include <LibWeb/Export.h>
 
 namespace Web::CSS {
@@ -115,6 +115,7 @@ ErrorOr<void> generate_implementation_file(JsonObject& pseudo_elements_data, Cor
 
     generator.append(R"~~~(
 #include <LibWeb/CSS/PseudoElement.h>
+#include <LibWeb/CSS/PropertyID.h>
 
 namespace Web::CSS {