diff --git a/Libraries/LibWeb/Bindings/Wrappable.h b/Libraries/LibWeb/Bindings/Wrappable.h
index f0b440145a4..211fc4755a1 100644
--- a/Libraries/LibWeb/Bindings/Wrappable.h
+++ b/Libraries/LibWeb/Bindings/Wrappable.h
@@ -31,8 +31,7 @@
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibWeb/Forward.h>
 
-namespace Web {
-namespace Bindings {
+namespace Web::Bindings {
 
 class Wrappable {
 public:
@@ -56,4 +55,3 @@ inline Wrapper* wrap_impl(JS::GlobalObject& global_object, NativeObject& native_
 }
 
 }
-}
diff --git a/Libraries/LibWeb/Bindings/Wrapper.h b/Libraries/LibWeb/Bindings/Wrapper.h
index b24cadd02e0..c83556605a3 100644
--- a/Libraries/LibWeb/Bindings/Wrapper.h
+++ b/Libraries/LibWeb/Bindings/Wrapper.h
@@ -31,8 +31,7 @@
 #include <LibJS/Runtime/Object.h>
 #include <LibWeb/Forward.h>
 
-namespace Web {
-namespace Bindings {
+namespace Web::Bindings {
 
 class Wrapper
     : public JS::Object
@@ -48,4 +47,3 @@ protected:
 };
 
 }
-}
diff --git a/Libraries/LibWeb/Bindings/XMLHttpRequestConstructor.cpp b/Libraries/LibWeb/Bindings/XMLHttpRequestConstructor.cpp
index e1bb113a74e..6bae08e8985 100644
--- a/Libraries/LibWeb/Bindings/XMLHttpRequestConstructor.cpp
+++ b/Libraries/LibWeb/Bindings/XMLHttpRequestConstructor.cpp
@@ -33,8 +33,7 @@
 #include <LibWeb/Bindings/XMLHttpRequestWrapper.h>
 #include <LibWeb/DOM/XMLHttpRequest.h>
 
-namespace Web {
-namespace Bindings {
+namespace Web::Bindings {
 
 XMLHttpRequestConstructor::XMLHttpRequestConstructor(JS::GlobalObject& global_object)
     : NativeFunction(*global_object.function_prototype())
@@ -69,4 +68,3 @@ JS::Value XMLHttpRequestConstructor::construct(JS::Interpreter& interpreter, Fun
 }
 
 }
-}
diff --git a/Libraries/LibWeb/Bindings/XMLHttpRequestConstructor.h b/Libraries/LibWeb/Bindings/XMLHttpRequestConstructor.h
index 5c9b733e735..bff68c67287 100644
--- a/Libraries/LibWeb/Bindings/XMLHttpRequestConstructor.h
+++ b/Libraries/LibWeb/Bindings/XMLHttpRequestConstructor.h
@@ -28,8 +28,7 @@
 
 #include <LibJS/Runtime/NativeFunction.h>
 
-namespace Web {
-namespace Bindings {
+namespace Web::Bindings {
 
 class XMLHttpRequestConstructor final : public JS::NativeFunction {
 public:
@@ -46,4 +45,3 @@ private:
 };
 
 }
-}
diff --git a/Libraries/LibWeb/Bindings/XMLHttpRequestPrototype.cpp b/Libraries/LibWeb/Bindings/XMLHttpRequestPrototype.cpp
index 32dee9d0335..1469a9e9d6b 100644
--- a/Libraries/LibWeb/Bindings/XMLHttpRequestPrototype.cpp
+++ b/Libraries/LibWeb/Bindings/XMLHttpRequestPrototype.cpp
@@ -32,8 +32,7 @@
 #include <LibWeb/Bindings/XMLHttpRequestWrapper.h>
 #include <LibWeb/DOM/XMLHttpRequest.h>
 
-namespace Web {
-namespace Bindings {
+namespace Web::Bindings {
 
 XMLHttpRequestPrototype::XMLHttpRequestPrototype(JS::GlobalObject& global_object)
     : Object(*global_object.object_prototype())
@@ -112,4 +111,3 @@ JS_DEFINE_NATIVE_GETTER(XMLHttpRequestPrototype::response_text_getter)
 }
 
 }
-}
diff --git a/Libraries/LibWeb/Bindings/XMLHttpRequestPrototype.h b/Libraries/LibWeb/Bindings/XMLHttpRequestPrototype.h
index 8667825a50d..a8742f1ca9b 100644
--- a/Libraries/LibWeb/Bindings/XMLHttpRequestPrototype.h
+++ b/Libraries/LibWeb/Bindings/XMLHttpRequestPrototype.h
@@ -28,8 +28,7 @@
 
 #include <LibJS/Runtime/Object.h>
 
-namespace Web {
-namespace Bindings {
+namespace Web::Bindings {
 
 class XMLHttpRequestPrototype final : public JS::Object {
     JS_OBJECT(XMLHttpRequestPrototype, JS::Object);
@@ -48,4 +47,3 @@ private:
 };
 
 }
-}
diff --git a/Libraries/LibWeb/Bindings/XMLHttpRequestWrapper.cpp b/Libraries/LibWeb/Bindings/XMLHttpRequestWrapper.cpp
index 98ae528e951..dedd97313a3 100644
--- a/Libraries/LibWeb/Bindings/XMLHttpRequestWrapper.cpp
+++ b/Libraries/LibWeb/Bindings/XMLHttpRequestWrapper.cpp
@@ -32,8 +32,7 @@
 #include <LibWeb/Bindings/XMLHttpRequestWrapper.h>
 #include <LibWeb/DOM/XMLHttpRequest.h>
 
-namespace Web {
-namespace Bindings {
+namespace Web::Bindings {
 
 XMLHttpRequestWrapper* wrap(JS::GlobalObject& global_object, XMLHttpRequest& impl)
 {
@@ -61,4 +60,3 @@ const XMLHttpRequest& XMLHttpRequestWrapper::impl() const
 }
 
 }
-}
diff --git a/Libraries/LibWeb/Bindings/XMLHttpRequestWrapper.h b/Libraries/LibWeb/Bindings/XMLHttpRequestWrapper.h
index cf23e15fce2..a961564b60d 100644
--- a/Libraries/LibWeb/Bindings/XMLHttpRequestWrapper.h
+++ b/Libraries/LibWeb/Bindings/XMLHttpRequestWrapper.h
@@ -28,8 +28,7 @@
 
 #include <LibWeb/Bindings/EventTargetWrapper.h>
 
-namespace Web {
-namespace Bindings {
+namespace Web::Bindings {
 
 class XMLHttpRequestWrapper final : public EventTargetWrapper {
 public:
@@ -46,4 +45,3 @@ private:
 XMLHttpRequestWrapper* wrap(JS::GlobalObject&, XMLHttpRequest&);
 
 }
-}
diff --git a/Libraries/LibWeb/CSS/StyleSheetList.cpp b/Libraries/LibWeb/CSS/StyleSheetList.cpp
index bbda79757ce..ec7bea2c236 100644
--- a/Libraries/LibWeb/CSS/StyleSheetList.cpp
+++ b/Libraries/LibWeb/CSS/StyleSheetList.cpp
@@ -26,8 +26,7 @@
 
 #include <LibWeb/CSS/StyleSheetList.h>
 
-namespace Web {
-namespace CSS {
+namespace Web::CSS {
 
 void StyleSheetList::add_sheet(NonnullRefPtr<StyleSheet> sheet)
 {
@@ -40,4 +39,3 @@ StyleSheetList::StyleSheetList(Document& document)
 }
 
 }
-}
diff --git a/Libraries/LibWeb/CSS/StyleSheetList.h b/Libraries/LibWeb/CSS/StyleSheetList.h
index ebccf4dccb3..47fc2ff4ea1 100644
--- a/Libraries/LibWeb/CSS/StyleSheetList.h
+++ b/Libraries/LibWeb/CSS/StyleSheetList.h
@@ -29,8 +29,7 @@
 #include <AK/RefCounted.h>
 #include <LibWeb/CSS/StyleSheet.h>
 
-namespace Web {
-namespace CSS {
+namespace Web::CSS {
 
 class StyleSheetList : public RefCounted<StyleSheetList> {
 public:
@@ -51,4 +50,3 @@ private:
 };
 
 }
-}
diff --git a/Libraries/LibWeb/CSS/StyleValue.h b/Libraries/LibWeb/CSS/StyleValue.h
index 584962eca92..18b2acdeadf 100644
--- a/Libraries/LibWeb/CSS/StyleValue.h
+++ b/Libraries/LibWeb/CSS/StyleValue.h
@@ -36,13 +36,11 @@
 #include <LibGfx/Color.h>
 #include <LibWeb/CSS/Length.h>
 #include <LibWeb/CSS/PropertyID.h>
+#include <LibWeb/Forward.h>
 #include <LibWeb/Loader/ImageResource.h>
 
-namespace Web {
+namespace Web::CSS {
 
-class Document;
-
-namespace CSS {
 enum class ValueID {
     Invalid,
     VendorSpecificLink,
@@ -153,6 +151,8 @@ enum class Float {
 
 }
 
+namespace Web {
+
 class StyleValue : public RefCounted<StyleValue> {
 public:
     virtual ~StyleValue();
diff --git a/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_cpp.cpp b/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_cpp.cpp
index 7fab48f81d8..4f813fd25ca 100644
--- a/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_cpp.cpp
+++ b/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_cpp.cpp
@@ -61,8 +61,7 @@ int main(int argc, char** argv)
 
     out() << "#include <AK/Assertions.h>";
     out() << "#include <LibWeb/CSS/PropertyID.h>";
-    out() << "namespace Web {";
-    out() << "namespace CSS {";
+    out() << "namespace Web::CSS {";
 
     out() << "PropertyID property_id_from_string(const StringView& string) {";
 
@@ -88,7 +87,6 @@ int main(int argc, char** argv)
     out() << "    }";
     out() << "}";
     out() << "}";
-    out() << "}";
 
     return 0;
 }
diff --git a/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_h.cpp b/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_h.cpp
index 1dbf80d9a30..30ad4d9be27 100644
--- a/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_h.cpp
+++ b/Libraries/LibWeb/CodeGenerators/Generate_CSS_PropertyID_h.cpp
@@ -63,8 +63,7 @@ int main(int argc, char** argv)
     out() << "#include <AK/StringView.h>";
     out() << "#include <AK/Traits.h>";
 
-    out() << "namespace Web {";
-    out() << "namespace CSS {";
+    out() << "namespace Web::CSS {";
     out() << "enum class PropertyID {";
     out() << "    Invalid,";
 
@@ -77,7 +76,6 @@ int main(int argc, char** argv)
 PropertyID property_id_from_string(const StringView&);\n\
 const char* string_from_property_id(PropertyID);\n\
 }\n\
-}\n\
 \n\
 namespace AK {\n\
 template<>\n\
diff --git a/Libraries/LibWeb/Forward.h b/Libraries/LibWeb/Forward.h
index 41ad85d60df..f4adf324561 100644
--- a/Libraries/LibWeb/Forward.h
+++ b/Libraries/LibWeb/Forward.h
@@ -75,7 +75,9 @@ class Window;
 class XMLHttpRequest;
 enum class QuirksMode;
 
-namespace Bindings {
+}
+
+namespace Web::Bindings {
 
 class CanvasRenderingContext2DWrapper;
 class DocumentWrapper;
@@ -99,5 +101,3 @@ class XMLHttpRequestPrototype;
 class XMLHttpRequestWrapper;
 
 }
-
-}
diff --git a/Libraries/LibWeb/Parser/CSSParser.h b/Libraries/LibWeb/Parser/CSSParser.h
index 25f478c16f2..dc38bb7c744 100644
--- a/Libraries/LibWeb/Parser/CSSParser.h
+++ b/Libraries/LibWeb/Parser/CSSParser.h
@@ -29,9 +29,7 @@
 #include <AK/NonnullRefPtr.h>
 #include <LibWeb/CSS/StyleSheet.h>
 
-namespace Web {
-
-namespace CSS {
+namespace Web::CSS {
 class ParsingContext {
 public:
     ParsingContext();
@@ -44,6 +42,8 @@ private:
 };
 }
 
+namespace Web {
+
 RefPtr<StyleSheet> parse_css(const CSS::ParsingContext&, const StringView&);
 RefPtr<StyleDeclaration> parse_css_declaration(const CSS::ParsingContext&, const StringView&);
 RefPtr<StyleValue> parse_css_value(const CSS::ParsingContext&, const StringView&);