diff --git a/dom/worklet/WorkletGlobalScope.h b/dom/worklet/WorkletGlobalScope.h
index 4067db42642d..1e4da6419fab 100644
--- a/dom/worklet/WorkletGlobalScope.h
+++ b/dom/worklet/WorkletGlobalScope.h
@@ -11,6 +11,7 @@
 #include "mozilla/ErrorResult.h"
 #include "mozilla/TimeStamp.h"
 #include "mozilla/dom/BindingDeclarations.h"
+#include "nsDOMNavigationTiming.h"
 #include "nsIGlobalObject.h"
 #include "nsWrapperCache.h"
 
diff --git a/layout/style/ImageLoader.cpp b/layout/style/ImageLoader.cpp
index a6b8f58266c2..9981cf6c536a 100644
--- a/layout/style/ImageLoader.cpp
+++ b/layout/style/ImageLoader.cpp
@@ -22,6 +22,8 @@
 #include "GeckoProfiler.h"
 #include "mozilla/layers/WebRenderUserData.h"
 
+using namespace mozilla::dom;
+
 namespace mozilla {
 namespace css {
 
diff --git a/layout/style/ServoCSSParser.cpp b/layout/style/ServoCSSParser.cpp
index 963aa75f1bb4..062d23e0273b 100644
--- a/layout/style/ServoCSSParser.cpp
+++ b/layout/style/ServoCSSParser.cpp
@@ -13,6 +13,7 @@
 #include "mozilla/dom/Document.h"
 
 using namespace mozilla;
+using namespace mozilla::dom;
 
 /* static */
 bool ServoCSSParser::IsValidCSSColor(const nsAString& aValue) {
diff --git a/layout/style/StyleAnimationValue.cpp b/layout/style/StyleAnimationValue.cpp
index 369d22795d84..4e1f6b5cd97e 100644
--- a/layout/style/StyleAnimationValue.cpp
+++ b/layout/style/StyleAnimationValue.cpp
@@ -33,6 +33,7 @@
 
 using namespace mozilla;
 using namespace mozilla::css;
+using namespace mozilla::dom;
 using namespace mozilla::gfx;
 using nsStyleTransformMatrix::Decompose2DMatrix;
 using nsStyleTransformMatrix::Decompose3DMatrix;
diff --git a/layout/style/nsDOMCSSAttrDeclaration.cpp b/layout/style/nsDOMCSSAttrDeclaration.cpp
index 5a0894657390..8da15e47db47 100644
--- a/layout/style/nsDOMCSSAttrDeclaration.cpp
+++ b/layout/style/nsDOMCSSAttrDeclaration.cpp
@@ -22,9 +22,10 @@
 #include "ActiveLayerTracker.h"
 
 using namespace mozilla;
+using namespace mozilla::dom;
 
-nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(
-    dom::Element* aElement, bool aIsSMILOverride)
+nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(Element* aElement,
+                                                           bool aIsSMILOverride)
     : mElement(aElement), mIsSMILOverride(aIsSMILOverride) {
   NS_ASSERTION(aElement, "Inline style for a NULL element?");
 }
diff --git a/layout/style/nsDOMCSSDeclaration.cpp b/layout/style/nsDOMCSSDeclaration.cpp
index 1a88b0d25144..d56ba46a23f9 100644
--- a/layout/style/nsDOMCSSDeclaration.cpp
+++ b/layout/style/nsDOMCSSDeclaration.cpp
@@ -22,13 +22,14 @@
 #include "mozilla/layers/ScrollLinkedEffectDetector.h"
 
 using namespace mozilla;
+using namespace mozilla::dom;
 
 nsDOMCSSDeclaration::~nsDOMCSSDeclaration() = default;
 
 /* virtual */
 JSObject* nsDOMCSSDeclaration::WrapObject(JSContext* aCx,
                                           JS::Handle<JSObject*> aGivenProto) {
-  return dom::CSS2Properties_Binding::Wrap(aCx, this, aGivenProto);
+  return CSS2Properties_Binding::Wrap(aCx, this, aGivenProto);
 }
 
 NS_IMPL_QUERY_INTERFACE(nsDOMCSSDeclaration, nsICSSDeclaration)
diff --git a/layout/style/nsHTMLStyleSheet.h b/layout/style/nsHTMLStyleSheet.h
index 5b607229c4e1..121f33230f35 100644
--- a/layout/style/nsHTMLStyleSheet.h
+++ b/layout/style/nsHTMLStyleSheet.h
@@ -22,6 +22,11 @@
 
 class nsMappedAttributes;
 struct RawServoDeclarationBlock;
+namespace mozilla {
+namespace dom {
+class Document;
+}  // namespace dom
+}  // namespace mozilla
 
 class nsHTMLStyleSheet final {
  public: