diff --git a/Libraries/LibWeb/CSS/CSSDescriptors.cpp b/Libraries/LibWeb/CSS/CSSDescriptors.cpp
index 79e1e993771..42a6234d89e 100644
--- a/Libraries/LibWeb/CSS/CSSDescriptors.cpp
+++ b/Libraries/LibWeb/CSS/CSSDescriptors.cpp
@@ -9,6 +9,7 @@
 #include <LibWeb/CSS/Serialize.h>
 #include <LibWeb/CSS/StyleValues/StyleValueList.h>
 #include <LibWeb/Infra/Strings.h>
+#include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/CSS/CSSFontFaceDescriptors.cpp b/Libraries/LibWeb/CSS/CSSFontFaceDescriptors.cpp
index ccc8225f0a5..b3e14cb860a 100644
--- a/Libraries/LibWeb/CSS/CSSFontFaceDescriptors.cpp
+++ b/Libraries/LibWeb/CSS/CSSFontFaceDescriptors.cpp
@@ -5,7 +5,9 @@
  */
 
 #include <LibWeb/Bindings/CSSFontFaceDescriptorsPrototype.h>
+#include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/CSS/CSSFontFaceDescriptors.h>
+#include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/CSS/CSSPageDescriptors.cpp b/Libraries/LibWeb/CSS/CSSPageDescriptors.cpp
index 07019d9a0b1..a667ba5348f 100644
--- a/Libraries/LibWeb/CSS/CSSPageDescriptors.cpp
+++ b/Libraries/LibWeb/CSS/CSSPageDescriptors.cpp
@@ -5,7 +5,9 @@
  */
 
 #include <LibWeb/Bindings/CSSPageDescriptorsPrototype.h>
+#include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/CSS/CSSPageDescriptors.h>
+#include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/CSS/CSSStyleProperties.h b/Libraries/LibWeb/CSS/CSSStyleProperties.h
index d29f850ba08..5163a826c83 100644
--- a/Libraries/LibWeb/CSS/CSSStyleProperties.h
+++ b/Libraries/LibWeb/CSS/CSSStyleProperties.h
@@ -9,6 +9,7 @@
 
 #include <LibWeb/CSS/CSSStyleDeclaration.h>
 #include <LibWeb/CSS/GeneratedCSSStyleProperties.h>
+#include <LibWeb/DOM/Node.h>
 
 namespace Web::CSS {
 
diff --git a/Libraries/LibWeb/DOM/AbstractElement.cpp b/Libraries/LibWeb/DOM/AbstractElement.cpp
index 04e211b539f..108b9efedc2 100644
--- a/Libraries/LibWeb/DOM/AbstractElement.cpp
+++ b/Libraries/LibWeb/DOM/AbstractElement.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <LibWeb/DOM/AbstractElement.h>
+#include <LibWeb/DOM/Element.h>
 
 namespace Web::DOM {
 
diff --git a/Libraries/LibWeb/DOM/AbstractElement.h b/Libraries/LibWeb/DOM/AbstractElement.h
index ed4d2a22a18..da236ad7bee 100644
--- a/Libraries/LibWeb/DOM/AbstractElement.h
+++ b/Libraries/LibWeb/DOM/AbstractElement.h
@@ -8,7 +8,7 @@
 
 #include <LibGC/Cell.h>
 #include <LibWeb/CSS/Selector.h>
-#include <LibWeb/DOM/Element.h>
+#include <LibWeb/Forward.h>
 
 namespace Web::DOM {
 
diff --git a/Libraries/LibWeb/Forward.h b/Libraries/LibWeb/Forward.h
index 45dc4e0dffb..95ca057165b 100644
--- a/Libraries/LibWeb/Forward.h
+++ b/Libraries/LibWeb/Forward.h
@@ -185,6 +185,7 @@ class ConicGradientStyleValue;
 class ContentStyleValue;
 class CounterDefinitionsStyleValue;
 class CounterStyleValue;
+class CountersSet;
 class CSSAnimation;
 class CSSColorValue;
 class CSSConditionRule;