diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index a6b81b6d31..c6707ca033 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -545,6 +545,7 @@ struct POSTResource;
 struct ScrollOptions;
 struct ScrollToOptions;
 struct SerializedFormData;
+struct StructuredSerializeOptions;
 struct ToggleTaskTracker;
 struct TransferDataHolder;
 }
diff --git a/Userland/Libraries/LibWeb/HTML/DedicatedWorkerGlobalScope.cpp b/Userland/Libraries/LibWeb/HTML/DedicatedWorkerGlobalScope.cpp
index 4b5ce18e2a..213c4fee4b 100644
--- a/Userland/Libraries/LibWeb/HTML/DedicatedWorkerGlobalScope.cpp
+++ b/Userland/Libraries/LibWeb/HTML/DedicatedWorkerGlobalScope.cpp
@@ -11,6 +11,7 @@
 #include <LibWeb/HTML/EventHandler.h>
 #include <LibWeb/HTML/EventNames.h>
 #include <LibWeb/HTML/MessageEvent.h>
+#include <LibWeb/HTML/MessagePort.h>
 
 namespace Web::HTML {
 
diff --git a/Userland/Libraries/LibWeb/HTML/MessagePort.cpp b/Userland/Libraries/LibWeb/HTML/MessagePort.cpp
index fd64364cb6..65fe991e85 100644
--- a/Userland/Libraries/LibWeb/HTML/MessagePort.cpp
+++ b/Userland/Libraries/LibWeb/HTML/MessagePort.cpp
@@ -20,6 +20,7 @@
 #include <LibWeb/HTML/MessageEvent.h>
 #include <LibWeb/HTML/MessagePort.h>
 #include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
+#include <LibWeb/HTML/StructuredSerializeOptions.h>
 #include <LibWeb/HTML/WorkerGlobalScope.h>
 
 namespace Web::HTML {
diff --git a/Userland/Libraries/LibWeb/HTML/MessagePort.h b/Userland/Libraries/LibWeb/HTML/MessagePort.h
index 2f47ace9ad..ebc5b0efa2 100644
--- a/Userland/Libraries/LibWeb/HTML/MessagePort.h
+++ b/Userland/Libraries/LibWeb/HTML/MessagePort.h
@@ -21,11 +21,6 @@ namespace Web::HTML {
     E(onmessage, HTML::EventNames::message)      \
     E(onmessageerror, HTML::EventNames::messageerror)
 
-// https://html.spec.whatwg.org/multipage/web-messaging.html#structuredserializeoptions
-struct StructuredSerializeOptions {
-    Vector<JS::Handle<JS::Object>> transfer;
-};
-
 // https://html.spec.whatwg.org/multipage/web-messaging.html#message-ports
 class MessagePort final : public DOM::EventTarget
     , public Bindings::Transferable {
diff --git a/Userland/Libraries/LibWeb/HTML/ServiceWorker.h b/Userland/Libraries/LibWeb/HTML/ServiceWorker.h
index fab8fa1b73..9c8ed7f2be 100644
--- a/Userland/Libraries/LibWeb/HTML/ServiceWorker.h
+++ b/Userland/Libraries/LibWeb/HTML/ServiceWorker.h
@@ -8,7 +8,6 @@
 
 #include <LibWeb/Bindings/ServiceWorkerPrototype.h>
 #include <LibWeb/DOM/EventTarget.h>
-#include <LibWeb/HTML/MessagePort.h>
 
 #define ENUMERATE_SERVICE_WORKER_EVENT_HANDLERS(E)  \
     E(onstatechange, HTML::EventNames::statechange) \
diff --git a/Userland/Libraries/LibWeb/HTML/StructuredSerializeOptions.h b/Userland/Libraries/LibWeb/HTML/StructuredSerializeOptions.h
new file mode 100644
index 0000000000..7ea3b7db73
--- /dev/null
+++ b/Userland/Libraries/LibWeb/HTML/StructuredSerializeOptions.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2024, Tim Flynn <trflynn89@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Vector.h>
+#include <LibJS/Runtime/Object.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/web-messaging.html#structuredserializeoptions
+struct StructuredSerializeOptions {
+    Vector<JS::Handle<JS::Object>> transfer;
+};
+
+}
diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index a6c7b434ce..0f0b9f7acc 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -44,6 +44,7 @@
 #include <LibWeb/HTML/HTMLObjectElement.h>
 #include <LibWeb/HTML/Location.h>
 #include <LibWeb/HTML/MessageEvent.h>
+#include <LibWeb/HTML/MessagePort.h>
 #include <LibWeb/HTML/Navigation.h>
 #include <LibWeb/HTML/Navigator.h>
 #include <LibWeb/HTML/PageTransitionEvent.h>
diff --git a/Userland/Libraries/LibWeb/HTML/Window.h b/Userland/Libraries/LibWeb/HTML/Window.h
index 3c3aba1fee..ad1d4c28ac 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.h
+++ b/Userland/Libraries/LibWeb/HTML/Window.h
@@ -24,6 +24,7 @@
 #include <LibWeb/HTML/Plugin.h>
 #include <LibWeb/HTML/Scripting/ImportMap.h>
 #include <LibWeb/HTML/ScrollOptions.h>
+#include <LibWeb/HTML/StructuredSerializeOptions.h>
 #include <LibWeb/HTML/WindowEventHandlers.h>
 #include <LibWeb/HTML/WindowOrWorkerGlobalScope.h>
 #include <LibWeb/RequestIdleCallback/IdleRequest.h>
diff --git a/Userland/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.cpp b/Userland/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.cpp
index a340de4fd9..afaee04520 100644
--- a/Userland/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.cpp
@@ -27,6 +27,7 @@
 #include <LibWeb/HTML/Scripting/ExceptionReporter.h>
 #include <LibWeb/HTML/Scripting/Fetching.h>
 #include <LibWeb/HTML/StructuredSerialize.h>
+#include <LibWeb/HTML/StructuredSerializeOptions.h>
 #include <LibWeb/HTML/Timer.h>
 #include <LibWeb/HTML/Window.h>
 #include <LibWeb/HTML/WindowOrWorkerGlobalScope.h>
diff --git a/Userland/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.h b/Userland/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.h
index 5aa68db9e9..8005c2ec9f 100644
--- a/Userland/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.h
+++ b/Userland/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.h
@@ -16,7 +16,6 @@
 #include <LibWeb/Fetch/Request.h>
 #include <LibWeb/Forward.h>
 #include <LibWeb/HTML/ImageBitmap.h>
-#include <LibWeb/HTML/MessagePort.h>
 #include <LibWeb/PerformanceTimeline/PerformanceEntry.h>
 #include <LibWeb/PerformanceTimeline/PerformanceEntryTuple.h>
 
diff --git a/Userland/Libraries/LibWeb/HTML/Worker.cpp b/Userland/Libraries/LibWeb/HTML/Worker.cpp
index 495d53b98f..0ab93578a3 100644
--- a/Userland/Libraries/LibWeb/HTML/Worker.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Worker.cpp
@@ -5,14 +5,12 @@
  */
 
 #include <AK/Debug.h>
-#include <LibJS/Runtime/ConsoleObject.h>
 #include <LibJS/Runtime/Realm.h>
-#include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/Bindings/WorkerPrototype.h>
+#include <LibWeb/HTML/MessagePort.h>
 #include <LibWeb/HTML/Scripting/Environments.h>
-#include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
+#include <LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h>
 #include <LibWeb/HTML/Worker.h>
-#include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::HTML {
 
diff --git a/Userland/Libraries/LibWeb/HTML/Worker.h b/Userland/Libraries/LibWeb/HTML/Worker.h
index e67aa8da68..c66f6ac528 100644
--- a/Userland/Libraries/LibWeb/HTML/Worker.h
+++ b/Userland/Libraries/LibWeb/HTML/Worker.h
@@ -6,20 +6,11 @@
 
 #pragma once
 
-#include <AK/RefCounted.h>
-#include <LibURL/Parser.h>
-#include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/Forward.h>
 #include <LibWeb/HTML/AbstractWorker.h>
-#include <LibWeb/HTML/MessageEvent.h>
-#include <LibWeb/HTML/MessagePort.h>
-#include <LibWeb/HTML/Scripting/ClassicScript.h>
-#include <LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h>
-#include <LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h>
 #include <LibWeb/HTML/Window.h>
 #include <LibWeb/HTML/WorkerAgent.h>
-#include <LibWeb/HTML/WorkerDebugConsoleClient.h>
-#include <LibWeb/Loader/ResourceLoader.h>
+#include <LibWeb/WebIDL/ExceptionOr.h>
 
 #define ENUMERATE_WORKER_EVENT_HANDLERS(E)  \
     E(onmessage, HTML::EventNames::message) \
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp b/Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp
index c50acc5464..b418787e56 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <LibWeb/Bindings/HostDefined.h>
+#include <LibWeb/HTML/MessagePort.h>
 #include <LibWeb/HTML/WorkerAgent.h>
 #include <LibWeb/Page/Page.h>
 #include <LibWeb/Worker/WebWorkerClient.h>
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerAgent.h b/Userland/Libraries/LibWeb/HTML/WorkerAgent.h
index d0f4bd8b68..004b4739cc 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerAgent.h
+++ b/Userland/Libraries/LibWeb/HTML/WorkerAgent.h
@@ -9,7 +9,6 @@
 #include <LibWeb/Bindings/RequestPrototype.h>
 #include <LibWeb/Bindings/WorkerPrototype.h>
 #include <LibWeb/Forward.h>
-#include <LibWeb/HTML/MessagePort.h>
 #include <LibWeb/Worker/WebWorkerClient.h>
 
 namespace Web::HTML {
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp b/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp
index 973454e7ef..1e798c1978 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp
@@ -11,6 +11,7 @@
 #include <LibWeb/HTML/EventHandler.h>
 #include <LibWeb/HTML/EventNames.h>
 #include <LibWeb/HTML/MessageEvent.h>
+#include <LibWeb/HTML/MessagePort.h>
 #include <LibWeb/HTML/Scripting/ClassicScript.h>
 #include <LibWeb/HTML/StructuredSerialize.h>
 #include <LibWeb/HTML/WorkerGlobalScope.h>
diff --git a/Userland/Services/WebWorker/DedicatedWorkerHost.cpp b/Userland/Services/WebWorker/DedicatedWorkerHost.cpp
index 262b935c97..1499b0be02 100644
--- a/Userland/Services/WebWorker/DedicatedWorkerHost.cpp
+++ b/Userland/Services/WebWorker/DedicatedWorkerHost.cpp
@@ -9,6 +9,7 @@
 #include <LibWeb/Fetch/Fetching/Fetching.h>
 #include <LibWeb/Fetch/Infrastructure/FetchAlgorithms.h>
 #include <LibWeb/HTML/DedicatedWorkerGlobalScope.h>
+#include <LibWeb/HTML/MessagePort.h>
 #include <LibWeb/HTML/Scripting/ClassicScript.h>
 #include <LibWeb/HTML/Scripting/EnvironmentSettingsSnapshot.h>
 #include <LibWeb/HTML/Scripting/Fetching.h>