diff --git a/Userland/Libraries/LibWeb/Bindings/Serializable.h b/Userland/Libraries/LibWeb/Bindings/Serializable.h
index 0cc85709876..c4ef2714774 100644
--- a/Userland/Libraries/LibWeb/Bindings/Serializable.h
+++ b/Userland/Libraries/LibWeb/Bindings/Serializable.h
@@ -19,7 +19,7 @@ public:
     virtual StringView interface_name() const = 0;
 
     // https://html.spec.whatwg.org/multipage/structured-data.html#serialization-steps
-    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord&, bool for_storage) = 0;
+    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord&, bool for_storage, HTML::SerializationMemory&) = 0;
     // https://html.spec.whatwg.org/multipage/structured-data.html#deserialization-steps
     virtual WebIDL::ExceptionOr<void> deserialization_steps(ReadonlySpan<u32> const&, size_t& position) = 0;
 };
diff --git a/Userland/Libraries/LibWeb/FileAPI/Blob.cpp b/Userland/Libraries/LibWeb/FileAPI/Blob.cpp
index f13c649f958..16feb91e5f4 100644
--- a/Userland/Libraries/LibWeb/FileAPI/Blob.cpp
+++ b/Userland/Libraries/LibWeb/FileAPI/Blob.cpp
@@ -149,7 +149,7 @@ void Blob::initialize(JS::Realm& realm)
     WEB_SET_PROTOTYPE_FOR_INTERFACE(Blob);
 }
 
-WebIDL::ExceptionOr<void> Blob::serialization_steps(HTML::SerializationRecord& record, bool)
+WebIDL::ExceptionOr<void> Blob::serialization_steps(HTML::SerializationRecord& record, bool, HTML::SerializationMemory&)
 {
     auto& vm = this->vm();
 
diff --git a/Userland/Libraries/LibWeb/FileAPI/Blob.h b/Userland/Libraries/LibWeb/FileAPI/Blob.h
index 642ad2fa028..a1b7facb1af 100644
--- a/Userland/Libraries/LibWeb/FileAPI/Blob.h
+++ b/Userland/Libraries/LibWeb/FileAPI/Blob.h
@@ -57,7 +57,7 @@ public:
 
     virtual StringView interface_name() const override { return "Blob"sv; }
 
-    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord& record, bool for_storage) override;
+    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord& record, bool for_storage, HTML::SerializationMemory&) override;
     virtual WebIDL::ExceptionOr<void> deserialization_steps(ReadonlySpan<u32> const& record, size_t& position) override;
 
 protected:
diff --git a/Userland/Libraries/LibWeb/FileAPI/File.cpp b/Userland/Libraries/LibWeb/FileAPI/File.cpp
index 5387cc28ae0..5f44390816b 100644
--- a/Userland/Libraries/LibWeb/FileAPI/File.cpp
+++ b/Userland/Libraries/LibWeb/FileAPI/File.cpp
@@ -87,7 +87,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<File>> File::construct_impl(JS::Realm& real
     return create(realm, file_bits, file_name, options);
 }
 
-WebIDL::ExceptionOr<void> File::serialization_steps(HTML::SerializationRecord& record, bool)
+WebIDL::ExceptionOr<void> File::serialization_steps(HTML::SerializationRecord& record, bool, HTML::SerializationMemory&)
 {
     auto& vm = this->vm();
 
diff --git a/Userland/Libraries/LibWeb/FileAPI/File.h b/Userland/Libraries/LibWeb/FileAPI/File.h
index 100a8eca763..11df4ece07c 100644
--- a/Userland/Libraries/LibWeb/FileAPI/File.h
+++ b/Userland/Libraries/LibWeb/FileAPI/File.h
@@ -32,7 +32,7 @@ public:
 
     virtual StringView interface_name() const override { return "File"sv; }
 
-    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord& record, bool for_storage) override;
+    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord& record, bool for_storage, HTML::SerializationMemory&) override;
     virtual WebIDL::ExceptionOr<void> deserialization_steps(ReadonlySpan<u32> const&, size_t& position) override;
 
 private:
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.cpp b/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.cpp
index 90816192116..19081d6a5ba 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.cpp
@@ -698,7 +698,7 @@ WebIDL::ExceptionOr<String> DOMMatrixReadOnly::to_string() const
 }
 
 // https://drafts.fxtf.org/geometry/#structured-serialization
-WebIDL::ExceptionOr<void> DOMMatrixReadOnly::serialization_steps(HTML::SerializationRecord& serialized, bool)
+WebIDL::ExceptionOr<void> DOMMatrixReadOnly::serialization_steps(HTML::SerializationRecord& serialized, bool, HTML::SerializationMemory&)
 {
     HTML::serialize_primitive_type(serialized, m_is_2d);
     // 1. If value’s is 2D is true:
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.h b/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.h
index 7a6882dd23c..f30b3b17bd7 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMMatrixReadOnly.h
@@ -115,7 +115,7 @@ public:
     WebIDL::ExceptionOr<String> to_string() const;
 
     virtual StringView interface_name() const override { return "DOMMatrixReadOnly"sv; }
-    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord&, bool for_storage) override;
+    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord&, bool for_storage, HTML::SerializationMemory&) override;
     virtual WebIDL::ExceptionOr<void> deserialization_steps(ReadonlySpan<u32> const& record, size_t& position) override;
 
 protected:
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.cpp b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.cpp
index 6c719ae301d..cb958eac12a 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.cpp
@@ -65,7 +65,7 @@ void DOMPointReadOnly::initialize(JS::Realm& realm)
     WEB_SET_PROTOTYPE_FOR_INTERFACE(DOMPointReadOnly);
 }
 
-WebIDL::ExceptionOr<void> DOMPointReadOnly::serialization_steps(HTML::SerializationRecord& serialized, bool)
+WebIDL::ExceptionOr<void> DOMPointReadOnly::serialization_steps(HTML::SerializationRecord& serialized, bool, HTML::SerializationMemory&)
 {
     // 1. Set serialized.[[X]] to value’s x coordinate.
     HTML::serialize_primitive_type(serialized, m_x);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.h b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.h
index ff3a9e4dc55..61e6d6ad4a2 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.h
@@ -45,7 +45,7 @@ public:
     WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMPoint>> matrix_transform(DOMMatrixInit&) const;
 
     virtual StringView interface_name() const override { return "DOMPointReadOnly"sv; }
-    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord&, bool for_storage) override;
+    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord&, bool for_storage, HTML::SerializationMemory&) override;
     virtual WebIDL::ExceptionOr<void> deserialization_steps(ReadonlySpan<u32> const&, size_t& position) override;
 
 protected:
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.cpp b/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.cpp
index 364a6542822..b9a135ba9e6 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.cpp
@@ -51,7 +51,7 @@ void DOMRectReadOnly::initialize(JS::Realm& realm)
 }
 
 // https://drafts.fxtf.org/geometry/#structured-serialization
-WebIDL::ExceptionOr<void> DOMRectReadOnly::serialization_steps(HTML::SerializationRecord& serialized, bool)
+WebIDL::ExceptionOr<void> DOMRectReadOnly::serialization_steps(HTML::SerializationRecord& serialized, bool, HTML::SerializationMemory&)
 {
     // 1. Set serialized.[[X]] to value’s x coordinate.
     HTML::serialize_primitive_type(serialized, this->x());
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.h b/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.h
index 3e3f43cf2fa..c6450ea458c 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.h
@@ -70,7 +70,7 @@ public:
     }
 
     virtual StringView interface_name() const override { return "DOMRectReadOnly"sv; }
-    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord&, bool for_storage) override;
+    virtual WebIDL::ExceptionOr<void> serialization_steps(HTML::SerializationRecord&, bool for_storage, HTML::SerializationMemory&) override;
     virtual WebIDL::ExceptionOr<void> deserialization_steps(ReadonlySpan<u32> const&, size_t& position) override;
 
 protected:
diff --git a/Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp b/Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp
index dd0f66fdc60..eded9d8885c 100644
--- a/Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp
+++ b/Userland/Libraries/LibWeb/HTML/StructuredSerialize.cpp
@@ -315,7 +315,7 @@ public:
             TRY(serialize_string(m_vm, m_serialized, serializable.interface_name()));
 
             // 1. Perform the serialization steps for value's primary interface, given value, serialized, and forStorage.
-            TRY(serializable.serialization_steps(m_serialized, m_for_storage));
+            TRY(serializable.serialization_steps(m_serialized, m_for_storage, m_memory));
         }
 
         // 20. Otherwise, if value is a platform object, then throw a "DataCloneError" DOMException.