diff --git a/Userland/Libraries/LibJS/CMakeLists.txt b/Userland/Libraries/LibJS/CMakeLists.txt
index 5a1d8a5717..a35daacd1d 100644
--- a/Userland/Libraries/LibJS/CMakeLists.txt
+++ b/Userland/Libraries/LibJS/CMakeLists.txt
@@ -23,6 +23,7 @@ set(SOURCES
     Contrib/Test262/IsHTMLDDA.cpp
     CyclicModule.cpp
     Heap/BlockAllocator.cpp
+    Heap/Cell.cpp
     Heap/CellAllocator.cpp
     Heap/Handle.cpp
     Heap/Heap.cpp
diff --git a/Userland/Libraries/LibJS/Heap/Cell.cpp b/Userland/Libraries/LibJS/Heap/Cell.cpp
new file mode 100644
index 0000000000..aebe7d5bbc
--- /dev/null
+++ b/Userland/Libraries/LibJS/Heap/Cell.cpp
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Heap/Cell.h>
+#include <LibJS/Heap/Heap.h>
+#include <LibJS/Runtime/Completion.h>
+#include <LibJS/Runtime/Value.h>
+
+namespace JS {
+
+ThrowCompletionOr<void> JS::Cell::initialize(JS::Realm&)
+{
+    return {};
+}
+
+void JS::Cell::Visitor::visit(JS::Value value)
+{
+    if (value.is_cell())
+        visit_impl(value.as_cell());
+}
+
+}
diff --git a/Userland/Libraries/LibJS/Heap/Cell.h b/Userland/Libraries/LibJS/Heap/Cell.h
index db1a7e4252..b7e808bbd6 100644
--- a/Userland/Libraries/LibJS/Heap/Cell.h
+++ b/Userland/Libraries/LibJS/Heap/Cell.h
@@ -14,8 +14,6 @@
 #include <LibJS/Forward.h>
 #include <LibJS/Heap/GCPtr.h>
 #include <LibJS/Heap/Internals.h>
-#include <LibJS/Runtime/Completion.h>
-#include <LibJS/Runtime/Value.h>
 
 namespace JS {
 
@@ -33,7 +31,7 @@ class Cell {
     AK_MAKE_NONMOVABLE(Cell);
 
 public:
-    virtual ThrowCompletionOr<void> initialize(Realm&) { return {}; }
+    virtual ThrowCompletionOr<void> initialize(Realm&);
     virtual ~Cell() = default;
 
     bool is_marked() const { return m_mark; }
@@ -75,11 +73,7 @@ public:
             visit_impl(const_cast<RemoveConst<T>&>(*cell.ptr()));
         }
 
-        void visit(Value value)
-        {
-            if (value.is_cell())
-                visit_impl(value.as_cell());
-        }
+        void visit(Value value);
 
         // Allow explicitly ignoring a GC-allocated member in a visit_edges implementation instead
         // of just not using it.
diff --git a/Userland/Libraries/LibJS/Heap/Heap.h b/Userland/Libraries/LibJS/Heap/Heap.h
index 4e7d763361..946a2a5cc2 100644
--- a/Userland/Libraries/LibJS/Heap/Heap.h
+++ b/Userland/Libraries/LibJS/Heap/Heap.h
@@ -21,6 +21,7 @@
 #include <LibJS/Heap/Handle.h>
 #include <LibJS/Heap/Internals.h>
 #include <LibJS/Heap/MarkedVector.h>
+#include <LibJS/Runtime/Completion.h>
 #include <LibJS/Runtime/WeakContainer.h>
 
 namespace JS {
diff --git a/Userland/Libraries/LibWeb/Bindings/PlatformObject.h b/Userland/Libraries/LibWeb/Bindings/PlatformObject.h
index 8372d91f8f..fa135cb107 100644
--- a/Userland/Libraries/LibWeb/Bindings/PlatformObject.h
+++ b/Userland/Libraries/LibWeb/Bindings/PlatformObject.h
@@ -7,7 +7,6 @@
 #pragma once
 
 #include <AK/Weakable.h>
-#include <LibJS/Heap/GCPtr.h>
 #include <LibJS/Runtime/Object.h>
 #include <LibWeb/Forward.h>
 
diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index df7b218b49..ae32b74555 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -54,6 +54,7 @@ set(SOURCES
     CSS/Parser/DeclarationOrAtRule.cpp
     CSS/Parser/Function.cpp
     CSS/Parser/Parser.cpp
+    CSS/Parser/ParsingContext.cpp
     CSS/Parser/Rule.cpp
     CSS/Parser/Token.cpp
     CSS/Parser/Tokenizer.cpp
diff --git a/Userland/Libraries/LibWeb/CSS/CSSImportRule.h b/Userland/Libraries/LibWeb/CSS/CSSImportRule.h
index 92d4941cc6..e64917d5e9 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSImportRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSImportRule.h
@@ -12,6 +12,7 @@
 #include <LibWeb/CSS/CSSRule.h>
 #include <LibWeb/CSS/CSSStyleSheet.h>
 #include <LibWeb/DOM/DocumentLoadEventDelayer.h>
+#include <LibWeb/Loader/Resource.h>
 
 namespace Web::CSS {
 
diff --git a/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp
index d8b0ad8eeb..7c70628e9c 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp
@@ -11,6 +11,11 @@
 
 namespace Web::CSS {
 
+WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSKeyframeRule>> CSSKeyframeRule::create(JS::Realm& realm, CSS::Percentage key, Web::CSS::CSSStyleDeclaration& declarations)
+{
+    return MUST_OR_THROW_OOM(realm.heap().allocate<CSSKeyframeRule>(realm, realm, key, declarations));
+}
+
 void CSSKeyframeRule::visit_edges(Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h b/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h
index 1ef0194fed..cfaf017482 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h
@@ -20,10 +20,7 @@ class CSSKeyframeRule final : public CSSRule {
     WEB_PLATFORM_OBJECT(CSSKeyframeRule, CSSRule);
 
 public:
-    static WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSKeyframeRule>> create(JS::Realm& realm, CSS::Percentage key, CSSStyleDeclaration& declarations)
-    {
-        return MUST_OR_THROW_OOM(realm.heap().allocate<CSSKeyframeRule>(realm, realm, key, declarations));
-    }
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSKeyframeRule>> create(JS::Realm& realm, CSS::Percentage key, CSSStyleDeclaration& declarations);
 
     virtual ~CSSKeyframeRule() = default;
 
diff --git a/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp
index d4019d71d2..8494597499 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp
@@ -10,6 +10,11 @@
 
 namespace Web::CSS {
 
+WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSKeyframesRule>> CSSKeyframesRule::create(JS::Realm& realm, AK::FlyString name, Vector<JS::NonnullGCPtr<CSSKeyframeRule>> keyframes)
+{
+    return MUST_OR_THROW_OOM(realm.heap().allocate<CSSKeyframesRule>(realm, realm, move(name), move(keyframes)));
+}
+
 void CSSKeyframesRule::visit_edges(Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h b/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h
index 2a14401952..2038e5fe4e 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h
@@ -21,10 +21,7 @@ class CSSKeyframesRule final : public CSSRule {
     WEB_PLATFORM_OBJECT(CSSKeyframesRule, CSSRule);
 
 public:
-    static WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSKeyframesRule>> create(JS::Realm& realm, FlyString name, Vector<JS::NonnullGCPtr<CSSKeyframeRule>> keyframes)
-    {
-        return MUST_OR_THROW_OOM(realm.heap().allocate<CSSKeyframesRule>(realm, realm, move(name), move(keyframes)));
-    }
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSKeyframesRule>> create(JS::Realm& realm, FlyString name, Vector<JS::NonnullGCPtr<CSSKeyframeRule>> keyframes);
 
     virtual ~CSSKeyframesRule() = default;
 
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
index d9114ced0f..f153b84da9 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
@@ -11,7 +11,6 @@
 #include <LibWeb/CSS/CSSRuleList.h>
 #include <LibWeb/CSS/CSSStyleRule.h>
 #include <LibWeb/CSS/StyleSheet.h>
-#include <LibWeb/Loader/Resource.h>
 
 namespace Web::CSS {
 
diff --git a/Userland/Libraries/LibWeb/CSS/ComputedValues.h b/Userland/Libraries/LibWeb/CSS/ComputedValues.h
index 44bf9e45c9..2d22d5ec62 100644
--- a/Userland/Libraries/LibWeb/CSS/ComputedValues.h
+++ b/Userland/Libraries/LibWeb/CSS/ComputedValues.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <AK/Optional.h>
+#include <LibGfx/Painter.h>
 #include <LibWeb/CSS/BackdropFilter.h>
 #include <LibWeb/CSS/CalculatedOr.h>
 #include <LibWeb/CSS/Clip.h>
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 509e216da0..80a6b6f54e 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -12,7 +12,6 @@
 #include <AK/Debug.h>
 #include <AK/GenericLexer.h>
 #include <AK/SourceLocation.h>
-#include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/CSS/CSSFontFaceRule.h>
 #include <LibWeb/CSS/CSSImportRule.h>
 #include <LibWeb/CSS/CSSKeyframeRule.h>
@@ -84,7 +83,6 @@
 #include <LibWeb/CSS/StyleValues/URLStyleValue.h>
 #include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
 #include <LibWeb/CSS/StyleValues/UnsetStyleValue.h>
-#include <LibWeb/DOM/Document.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/Infra/Strings.h>
 
@@ -95,43 +93,6 @@ static void log_parse_error(SourceLocation const& location = SourceLocation::cur
 
 namespace Web::CSS::Parser {
 
-ParsingContext::ParsingContext(JS::Realm& realm)
-    : m_realm(realm)
-{
-}
-
-ParsingContext::ParsingContext(DOM::Document const& document, AK::URL url)
-    : m_realm(const_cast<JS::Realm&>(document.realm()))
-    , m_document(&document)
-    , m_url(move(url))
-{
-}
-
-ParsingContext::ParsingContext(DOM::Document const& document)
-    : m_realm(const_cast<JS::Realm&>(document.realm()))
-    , m_document(&document)
-    , m_url(document.url())
-{
-}
-
-ParsingContext::ParsingContext(DOM::ParentNode& parent_node)
-    : m_realm(parent_node.realm())
-    , m_document(&parent_node.document())
-    , m_url(parent_node.document().url())
-{
-}
-
-bool ParsingContext::in_quirks_mode() const
-{
-    return m_document ? m_document->in_quirks_mode() : false;
-}
-
-// https://www.w3.org/TR/css-values-4/#relative-urls
-AK::URL ParsingContext::complete_url(StringView relative_url) const
-{
-    return m_url.complete_url(relative_url);
-}
-
 ErrorOr<Parser> Parser::create(ParsingContext const& context, StringView input, StringView encoding)
 {
     auto tokens = TRY(Tokenizer::tokenize(input, encoding));
@@ -9279,7 +9240,7 @@ CSS::Length CSS::Parser::Parser::parse_as_sizes_attribute()
         //    If it does not parse correctly, or it does parse correctly but the <media-condition> evaluates to false, continue.
         TokenStream<ComponentValue> token_stream { unparsed_size };
         auto media_condition = parse_media_condition(token_stream, MediaCondition::AllowOr::Yes);
-        if (media_condition && media_condition->evaluate(m_context.document()->window()) == CSS::MatchResult::True) {
+        if (media_condition && media_condition->evaluate(*m_context.window()) == CSS::MatchResult::True) {
             return size.value();
         } else {
             continue;
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.h b/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
index 3e99382f0b..2dbcdc7980 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
@@ -44,6 +44,7 @@ public:
 
     bool in_quirks_mode() const;
     DOM::Document const* document() const { return m_document; }
+    HTML::Window const* window() const;
     AK::URL complete_url(StringView) const;
 
     PropertyID current_property_id() const { return m_current_property_id; }
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/ParsingContext.cpp b/Userland/Libraries/LibWeb/CSS/Parser/ParsingContext.cpp
new file mode 100644
index 0000000000..671a2b35c1
--- /dev/null
+++ b/Userland/Libraries/LibWeb/CSS/Parser/ParsingContext.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2020-2021, the SerenityOS developers.
+ * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
+ * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/CSS/Parser/Parser.h>
+#include <LibWeb/DOM/Document.h>
+
+namespace Web::CSS::Parser {
+
+ParsingContext::ParsingContext(JS::Realm& realm)
+    : m_realm(realm)
+{
+}
+
+ParsingContext::ParsingContext(DOM::Document const& document, AK::URL url)
+    : m_realm(const_cast<JS::Realm&>(document.realm()))
+    , m_document(&document)
+    , m_url(move(url))
+{
+}
+
+ParsingContext::ParsingContext(DOM::Document const& document)
+    : m_realm(const_cast<JS::Realm&>(document.realm()))
+    , m_document(&document)
+    , m_url(document.url())
+{
+}
+
+ParsingContext::ParsingContext(DOM::ParentNode& parent_node)
+    : m_realm(parent_node.realm())
+    , m_document(&parent_node.document())
+    , m_url(parent_node.document().url())
+{
+}
+
+bool ParsingContext::in_quirks_mode() const
+{
+    return m_document ? m_document->in_quirks_mode() : false;
+}
+
+// https://www.w3.org/TR/css-values-4/#relative-urls
+AK::URL ParsingContext::complete_url(StringView relative_url) const
+{
+    return m_url.complete_url(relative_url);
+}
+
+HTML::Window const* ParsingContext::window() const
+{
+    return m_document ? &m_document->window() : nullptr;
+}
+
+}
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
index 95e783ab6f..340f97889e 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
@@ -7,6 +7,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibGfx/Font/FontDatabase.h>
 #include <LibGfx/Font/FontStyleMapping.h>
 #include <LibWeb/CSS/StyleValue.h>
 #include <LibWeb/CSS/StyleValues/AbstractImageStyleValue.h>
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValue.h
index df94f2c553..fcad90c013 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.h
@@ -20,7 +20,7 @@
 #include <AK/Variant.h>
 #include <AK/Vector.h>
 #include <AK/WeakPtr.h>
-#include <LibGfx/Painter.h>
+#include <LibGfx/Color.h>
 #include <LibWeb/CSS/Enums.h>
 #include <LibWeb/CSS/Length.h>
 #include <LibWeb/CSS/ValueID.h>
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h
index 0f5a7c864b..a580d7cfc9 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleValues/CalculatedStyleValue.h
@@ -9,6 +9,7 @@
 
 #pragma once
 
+#include <AK/Function.h>
 #include <LibWeb/CSS/Angle.h>
 #include <LibWeb/CSS/CSSNumericType.h>
 #include <LibWeb/CSS/Frequency.h>
diff --git a/Userland/Libraries/LibWeb/DOM/IDLEventListener.cpp b/Userland/Libraries/LibWeb/DOM/IDLEventListener.cpp
index 18b5481fd7..22e8a40d63 100644
--- a/Userland/Libraries/LibWeb/DOM/IDLEventListener.cpp
+++ b/Userland/Libraries/LibWeb/DOM/IDLEventListener.cpp
@@ -4,6 +4,8 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibJS/Heap/Heap.h>
+#include <LibJS/Runtime/Error.h>
 #include <LibWeb/DOM/IDLEventListener.h>
 
 namespace Web::DOM {
diff --git a/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp b/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
index ffc19db559..cf12fe9c1f 100644
--- a/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
+++ b/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
@@ -5,6 +5,8 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibJS/Heap/Heap.h>
+#include <LibJS/Runtime/Error.h>
 #include <LibWeb/DOM/LiveNodeList.h>
 #include <LibWeb/DOM/Node.h>
 
diff --git a/Userland/Libraries/LibWeb/DOM/StaticNodeList.cpp b/Userland/Libraries/LibWeb/DOM/StaticNodeList.cpp
index bf5804d902..03821977f4 100644
--- a/Userland/Libraries/LibWeb/DOM/StaticNodeList.cpp
+++ b/Userland/Libraries/LibWeb/DOM/StaticNodeList.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <LibJS/Heap/Heap.h>
+#include <LibJS/Runtime/Error.h>
 #include <LibWeb/DOM/StaticNodeList.h>
 
 namespace Web::DOM {
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h b/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
index 8652345dfb..e97b5178af 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
@@ -8,10 +8,7 @@
 #pragma once
 
 #include <AK/URL.h>
-#include <LibJS/Runtime/ExecutionContext.h>
-#include <LibJS/Runtime/GlobalObject.h>
-#include <LibJS/Runtime/Object.h>
-#include <LibJS/Runtime/Realm.h>
+#include <LibJS/Forward.h>
 #include <LibWeb/HTML/EventLoop/EventLoop.h>
 #include <LibWeb/HTML/Origin.h>
 #include <LibWeb/HTML/Scripting/ModuleMap.h>
diff --git a/Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp b/Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp
index 82d0d6cb79..3fbb980600 100644
--- a/Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp
+++ b/Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp
@@ -8,6 +8,7 @@
 #include <AK/HashTable.h>
 #include <AK/Vector.h>
 #include <LibJS/Forward.h>
+#include <LibJS/Runtime/VM.h>
 #include <LibWeb/HTML/StructuredSerialize.h>
 #include <LibWeb/WebIDL/ExceptionOr.h>
 
diff --git a/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp b/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp
index 2a118284d0..19b76e2329 100644
--- a/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp
+++ b/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp
@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/QuickSort.h>
 #include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/BrowsingContextGroup.h>
diff --git a/Userland/Libraries/LibWeb/Painting/GradientPainting.cpp b/Userland/Libraries/LibWeb/Painting/GradientPainting.cpp
index 6072ccc74f..8409f25656 100644
--- a/Userland/Libraries/LibWeb/Painting/GradientPainting.cpp
+++ b/Userland/Libraries/LibWeb/Painting/GradientPainting.cpp
@@ -6,6 +6,7 @@
 
 #include <AK/Math.h>
 #include <LibGfx/Gradients.h>
+#include <LibGfx/Painter.h>
 #include <LibWeb/CSS/StyleValues/ConicGradientStyleValue.h>
 #include <LibWeb/CSS/StyleValues/LinearGradientStyleValue.h>
 #include <LibWeb/CSS/StyleValues/RadialGradientStyleValue.h>
diff --git a/Userland/Libraries/LibWeb/Painting/MarkerPaintable.cpp b/Userland/Libraries/LibWeb/Painting/MarkerPaintable.cpp
index ff97bd5bc4..2dc01f0dab 100644
--- a/Userland/Libraries/LibWeb/Painting/MarkerPaintable.cpp
+++ b/Userland/Libraries/LibWeb/Painting/MarkerPaintable.cpp
@@ -6,6 +6,7 @@
 
 #include <LibGfx/AntiAliasingPainter.h>
 #include <LibGfx/StylePainter.h>
+#include <LibJS/Heap/Heap.h>
 #include <LibWeb/Layout/ListItemMarkerBox.h>
 #include <LibWeb/Painting/MarkerPaintable.h>
 
diff --git a/Userland/Libraries/LibWeb/WebIDL/DOMException.h b/Userland/Libraries/LibWeb/WebIDL/DOMException.h
index 0c9c48a573..1ba5993bd8 100644
--- a/Userland/Libraries/LibWeb/WebIDL/DOMException.h
+++ b/Userland/Libraries/LibWeb/WebIDL/DOMException.h
@@ -8,7 +8,6 @@
 
 #include <AK/DeprecatedFlyString.h>
 #include <AK/Diagnostics.h>
-#include <LibJS/Runtime/VM.h>
 #include <LibWeb/Bindings/PlatformObject.h>
 #include <LibWeb/HTML/Scripting/Environments.h>