diff --git a/Libraries/LibWeb/HTML/FormAssociatedElement.h b/Libraries/LibWeb/HTML/FormAssociatedElement.h
index bf2c53f74e2..3e02ad553d4 100644
--- a/Libraries/LibWeb/HTML/FormAssociatedElement.h
+++ b/Libraries/LibWeb/HTML/FormAssociatedElement.h
@@ -49,7 +49,7 @@ private:
     {                                                                                                                                                                       \
         ElementBaseClass::attribute_changed(name, old_value, value, namespace_);                                                                                            \
         form_node_attribute_changed(name, value);                                                                                                                           \
-        form_associated_element_attribute_changed(name, value);                                                                                                             \
+        form_associated_element_attribute_changed(name, value, namespace_);                                                                                                 \
     }
 
 // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#selection-direction
@@ -110,7 +110,7 @@ protected:
 
     virtual void form_associated_element_was_inserted() { }
     virtual void form_associated_element_was_removed(DOM::Node*) { }
-    virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&) { }
+    virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&, Optional<FlyString> const&) { }
 
     void form_node_was_inserted();
     void form_node_was_removed();
diff --git a/Libraries/LibWeb/HTML/HTMLImageElement.cpp b/Libraries/LibWeb/HTML/HTMLImageElement.cpp
index 2d5207c1aff..fbc453ac199 100644
--- a/Libraries/LibWeb/HTML/HTMLImageElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLImageElement.cpp
@@ -113,7 +113,7 @@ void HTMLImageElement::apply_presentational_hints(CSS::StyleProperties& style) c
     });
 }
 
-void HTMLImageElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value)
+void HTMLImageElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value, Optional<FlyString> const&)
 {
     if (name == HTML::AttributeNames::crossorigin) {
         m_cors_setting = cors_setting_attribute_from_keyword(value);
diff --git a/Libraries/LibWeb/HTML/HTMLImageElement.h b/Libraries/LibWeb/HTML/HTMLImageElement.h
index a7b06ee28ad..ddc8854e8bc 100644
--- a/Libraries/LibWeb/HTML/HTMLImageElement.h
+++ b/Libraries/LibWeb/HTML/HTMLImageElement.h
@@ -38,7 +38,7 @@ class HTMLImageElement final
 public:
     virtual ~HTMLImageElement() override;
 
-    virtual void form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value) override;
+    virtual void form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value, Optional<FlyString> const&) override;
 
     Optional<String> alternative_text() const override
     {
diff --git a/Libraries/LibWeb/HTML/HTMLInputElement.cpp b/Libraries/LibWeb/HTML/HTMLInputElement.cpp
index 25d96221fa7..607ce240fb5 100644
--- a/Libraries/LibWeb/HTML/HTMLInputElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLInputElement.cpp
@@ -1195,7 +1195,7 @@ void HTMLInputElement::did_lose_focus()
     commit_pending_changes();
 }
 
-void HTMLInputElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value)
+void HTMLInputElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value, Optional<FlyString> const&)
 {
     if (name == HTML::AttributeNames::checked) {
         if (!value.has_value()) {
diff --git a/Libraries/LibWeb/HTML/HTMLInputElement.h b/Libraries/LibWeb/HTML/HTMLInputElement.h
index bf2df331779..0990ab3153a 100644
--- a/Libraries/LibWeb/HTML/HTMLInputElement.h
+++ b/Libraries/LibWeb/HTML/HTMLInputElement.h
@@ -185,7 +185,7 @@ public:
 
     virtual void form_associated_element_was_inserted() override;
     virtual void form_associated_element_was_removed(DOM::Node*) override;
-    virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&) override;
+    virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&, Optional<FlyString> const&) override;
 
     virtual WebIDL::ExceptionOr<void> cloned(Node&, bool) override;
 
diff --git a/Libraries/LibWeb/HTML/HTMLObjectElement.cpp b/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
index aba1d2b115c..cbc48c862de 100644
--- a/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
@@ -78,7 +78,7 @@ void HTMLObjectElement::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_document_observer);
 }
 
-void HTMLObjectElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const&)
+void HTMLObjectElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const&, Optional<FlyString> const&)
 {
     // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-object-element
     // Whenever one of the following conditions occur:
diff --git a/Libraries/LibWeb/HTML/HTMLObjectElement.h b/Libraries/LibWeb/HTML/HTMLObjectElement.h
index acbe7c87777..94a1c70ab99 100644
--- a/Libraries/LibWeb/HTML/HTMLObjectElement.h
+++ b/Libraries/LibWeb/HTML/HTMLObjectElement.h
@@ -33,7 +33,7 @@ class HTMLObjectElement final
 public:
     virtual ~HTMLObjectElement() override;
 
-    virtual void form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value) override;
+    virtual void form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
     virtual void form_associated_element_was_removed(DOM::Node*) override;
 
     String data() const;
diff --git a/Libraries/LibWeb/HTML/HTMLOutputElement.cpp b/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
index 12fc2e06eeb..dae7cfa3cb7 100644
--- a/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
@@ -32,7 +32,7 @@ void HTMLOutputElement::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_html_for);
 }
 
-void HTMLOutputElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value)
+void HTMLOutputElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value, Optional<FlyString> const&)
 {
     if (name == HTML::AttributeNames::for_) {
         if (m_html_for)
diff --git a/Libraries/LibWeb/HTML/HTMLOutputElement.h b/Libraries/LibWeb/HTML/HTMLOutputElement.h
index 849e3f985f0..6c066dd78e1 100644
--- a/Libraries/LibWeb/HTML/HTMLOutputElement.h
+++ b/Libraries/LibWeb/HTML/HTMLOutputElement.h
@@ -63,7 +63,7 @@ private:
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor& visitor) override;
 
-    virtual void form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value) override;
+    virtual void form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value, Optional<FlyString> const&) override;
 
     GC::Ptr<DOM::DOMTokenList> m_html_for;
 
diff --git a/Libraries/LibWeb/HTML/HTMLTextAreaElement.cpp b/Libraries/LibWeb/HTML/HTMLTextAreaElement.cpp
index 89f2bdac319..bd9d264af27 100644
--- a/Libraries/LibWeb/HTML/HTMLTextAreaElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLTextAreaElement.cpp
@@ -439,7 +439,7 @@ void HTMLTextAreaElement::children_changed()
     }
 }
 
-void HTMLTextAreaElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value)
+void HTMLTextAreaElement::form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value, Optional<FlyString> const&)
 {
     if (name == HTML::AttributeNames::placeholder) {
         if (m_placeholder_text_node)
diff --git a/Libraries/LibWeb/HTML/HTMLTextAreaElement.h b/Libraries/LibWeb/HTML/HTMLTextAreaElement.h
index 3053f63d2da..92a7291338a 100644
--- a/Libraries/LibWeb/HTML/HTMLTextAreaElement.h
+++ b/Libraries/LibWeb/HTML/HTMLTextAreaElement.h
@@ -68,7 +68,7 @@ public:
 
     virtual void form_associated_element_was_inserted() override;
     virtual void form_associated_element_was_removed(DOM::Node*) override;
-    virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&) override;
+    virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&, Optional<FlyString> const&) override;
 
     virtual void children_changed() override;