diff --git a/Userland/Libraries/LibWeb/Bindings/HostDefined.cpp b/Userland/Libraries/LibWeb/Bindings/HostDefined.cpp
new file mode 100644
index 00000000000..95487e8c11b
--- /dev/null
+++ b/Userland/Libraries/LibWeb/Bindings/HostDefined.cpp
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2024, Shannon Booth <shannon@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/HostDefined.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+
+namespace Web::Bindings {
+
+void HostDefined::visit_edges(JS::Cell::Visitor& visitor)
+{
+    JS::Realm::HostDefined::visit_edges(visitor);
+    visitor.visit(intrinsics);
+}
+
+}
diff --git a/Userland/Libraries/LibWeb/Bindings/HostDefined.h b/Userland/Libraries/LibWeb/Bindings/HostDefined.h
new file mode 100644
index 00000000000..89c564418ea
--- /dev/null
+++ b/Userland/Libraries/LibWeb/Bindings/HostDefined.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2024, Shannon Booth <shannon@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Heap/GCPtr.h>
+#include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Forward.h>
+
+namespace Web::Bindings {
+
+struct HostDefined : public JS::Realm::HostDefined {
+    explicit HostDefined(JS::NonnullGCPtr<Intrinsics> intrinsics)
+        : intrinsics(intrinsics)
+    {
+    }
+    virtual ~HostDefined() override = default;
+    virtual void visit_edges(JS::Cell::Visitor& visitor) override;
+
+    JS::NonnullGCPtr<Intrinsics> intrinsics;
+};
+
+}
diff --git a/Userland/Libraries/LibWeb/Bindings/Intrinsics.cpp b/Userland/Libraries/LibWeb/Bindings/Intrinsics.cpp
index 21f0d8aaa62..61fc83d386d 100644
--- a/Userland/Libraries/LibWeb/Bindings/Intrinsics.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/Intrinsics.cpp
@@ -10,6 +10,7 @@
 #include <LibJS/Runtime/Object.h>
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/Bindings/PrincipalHostDefined.h>
+#include <LibWeb/Bindings/SyntheticHostDefined.h>
 
 namespace Web::Bindings {
 
@@ -32,7 +33,7 @@ bool Intrinsics::is_exposed(StringView name) const
 Intrinsics& host_defined_intrinsics(JS::Realm& realm)
 {
     VERIFY(realm.host_defined());
-    return verify_cast<Bindings::PrincipalHostDefined>(*realm.host_defined()).intrinsics;
+    return verify_cast<Bindings::HostDefined>(*realm.host_defined()).intrinsics;
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/Bindings/MainThreadVM.cpp b/Userland/Libraries/LibWeb/Bindings/MainThreadVM.cpp
index 5d3a54d7e41..964e9053002 100644
--- a/Userland/Libraries/LibWeb/Bindings/MainThreadVM.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/MainThreadVM.cpp
@@ -589,13 +589,13 @@ ErrorOr<void> initialize_main_thread_vm(HTML::EventLoop::Type type)
         };
 
         // 8. Set realm.[[HostDefined]] to settings.
-        realm.set_host_defined(make<Bindings::SyntheticHostDefined>(move(settings)));
+        realm.set_host_defined(make<Bindings::SyntheticHostDefined>(move(settings), realm.heap().allocate<Bindings::Intrinsics>(realm, realm)));
 
         // 9. Set realm.[[GlobalObject]] to globalObject.
         realm.set_global_object(global_object);
 
         // 10. Set realm.[[GlobalEnv]] to NewGlobalEnvironment(globalObject, globalObject).
-        realm.set_global_environment(realm.vm().heap().allocate_without_realm<JS::GlobalEnvironment>(global_object, global_object));
+        realm.set_global_environment(realm.heap().allocate_without_realm<JS::GlobalEnvironment>(global_object, global_object));
 
         // 11. Perform ? SetDefaultGlobalBindings(realm).
         set_default_global_bindings(realm);
diff --git a/Userland/Libraries/LibWeb/Bindings/PrincipalHostDefined.cpp b/Userland/Libraries/LibWeb/Bindings/PrincipalHostDefined.cpp
index a5c2c60a51d..d76bc51deeb 100644
--- a/Userland/Libraries/LibWeb/Bindings/PrincipalHostDefined.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/PrincipalHostDefined.cpp
@@ -15,9 +15,8 @@ namespace Web::Bindings {
 
 void PrincipalHostDefined::visit_edges(JS::Cell::Visitor& visitor)
 {
-    JS::Realm::HostDefined::visit_edges(visitor);
+    HostDefined::visit_edges(visitor);
     visitor.visit(environment_settings_object);
-    visitor.visit(intrinsics);
     visitor.visit(page);
 }
 
diff --git a/Userland/Libraries/LibWeb/Bindings/PrincipalHostDefined.h b/Userland/Libraries/LibWeb/Bindings/PrincipalHostDefined.h
index d0d465a0aba..c1f9df16564 100644
--- a/Userland/Libraries/LibWeb/Bindings/PrincipalHostDefined.h
+++ b/Userland/Libraries/LibWeb/Bindings/PrincipalHostDefined.h
@@ -9,14 +9,15 @@
 #include <AK/TypeCasts.h>
 #include <LibJS/Heap/GCPtr.h>
 #include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Bindings/HostDefined.h>
 #include <LibWeb/Forward.h>
 
 namespace Web::Bindings {
 
-struct PrincipalHostDefined : public JS::Realm::HostDefined {
+struct PrincipalHostDefined : public HostDefined {
     PrincipalHostDefined(JS::NonnullGCPtr<HTML::EnvironmentSettingsObject> eso, JS::NonnullGCPtr<Intrinsics> intrinsics, JS::NonnullGCPtr<Page> page)
-        : environment_settings_object(eso)
-        , intrinsics(intrinsics)
+        : HostDefined(intrinsics)
+        , environment_settings_object(eso)
         , page(page)
     {
     }
@@ -24,7 +25,6 @@ struct PrincipalHostDefined : public JS::Realm::HostDefined {
     virtual void visit_edges(JS::Cell::Visitor& visitor) override;
 
     JS::NonnullGCPtr<HTML::EnvironmentSettingsObject> environment_settings_object;
-    JS::NonnullGCPtr<Intrinsics> intrinsics;
     JS::NonnullGCPtr<Page> page;
 };
 
diff --git a/Userland/Libraries/LibWeb/Bindings/SyntheticHostDefined.h b/Userland/Libraries/LibWeb/Bindings/SyntheticHostDefined.h
index f404dacb0fb..157298801c1 100644
--- a/Userland/Libraries/LibWeb/Bindings/SyntheticHostDefined.h
+++ b/Userland/Libraries/LibWeb/Bindings/SyntheticHostDefined.h
@@ -7,14 +7,16 @@
 #pragma once
 
 #include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Bindings/HostDefined.h>
 #include <LibWeb/Forward.h>
 #include <LibWeb/HTML/Scripting/SyntheticRealmSettings.h>
 
 namespace Web::Bindings {
 
-struct SyntheticHostDefined : public JS::Realm::HostDefined {
-    SyntheticHostDefined(HTML::SyntheticRealmSettings synthetic_realm_settings)
-        : synthetic_realm_settings(move(synthetic_realm_settings))
+struct SyntheticHostDefined : public HostDefined {
+    SyntheticHostDefined(HTML::SyntheticRealmSettings synthetic_realm_settings, JS::NonnullGCPtr<Intrinsics> intrinsics)
+        : HostDefined(intrinsics)
+        , synthetic_realm_settings(move(synthetic_realm_settings))
     {
     }
 
diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index 1aa0ccba80f..62308100330 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -23,6 +23,7 @@ set(SOURCES
     Bindings/MainThreadVM.cpp
     Bindings/OptionConstructor.cpp
     Bindings/PlatformObject.cpp
+    Bindings/HostDefined.cpp
     Bindings/PrincipalHostDefined.cpp
     Bindings/SyntheticHostDefined.cpp
     Clipboard/Clipboard.cpp