diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
index 3314dc6fc6..fdb79bb4fb 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
@@ -83,7 +83,7 @@ ErrorOr<void> HTMLFormElement::submit_form(JS::GCPtr<HTMLElement> submitter, boo
 
         SubmitEventInit event_init {};
         event_init.submitter = submitter_button;
-        auto submit_event = SubmitEvent::create(realm(), EventNames::submit, event_init).release_value_but_fixme_should_propagate_errors();
+        auto submit_event = SubmitEvent::create(realm(), String::from_deprecated_string(EventNames::submit).release_value_but_fixme_should_propagate_errors(), event_init).release_value_but_fixme_should_propagate_errors();
         submit_event->set_bubbles(true);
         submit_event->set_cancelable(true);
         bool continue_ = dispatch_event(*submit_event);
diff --git a/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp b/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp
index 7b3afda13e..74a6373e12 100644
--- a/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp
@@ -9,18 +9,18 @@
 
 namespace Web::HTML {
 
-WebIDL::ExceptionOr<JS::NonnullGCPtr<SubmitEvent>> SubmitEvent::create(JS::Realm& realm, DeprecatedFlyString const& event_name, SubmitEventInit const& event_init)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<SubmitEvent>> SubmitEvent::create(JS::Realm& realm, FlyString const& event_name, SubmitEventInit const& event_init)
 {
     return MUST_OR_THROW_OOM(realm.heap().allocate<SubmitEvent>(realm, realm, event_name, event_init));
 }
 
-WebIDL::ExceptionOr<JS::NonnullGCPtr<SubmitEvent>> SubmitEvent::construct_impl(JS::Realm& realm, DeprecatedFlyString const& event_name, SubmitEventInit const& event_init)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<SubmitEvent>> SubmitEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, SubmitEventInit const& event_init)
 {
     return create(realm, event_name, event_init);
 }
 
-SubmitEvent::SubmitEvent(JS::Realm& realm, DeprecatedFlyString const& event_name, SubmitEventInit const& event_init)
-    : DOM::Event(realm, event_name, event_init)
+SubmitEvent::SubmitEvent(JS::Realm& realm, FlyString const& event_name, SubmitEventInit const& event_init)
+    : DOM::Event(realm, event_name.to_deprecated_fly_string(), event_init)
     , m_submitter(event_init.submitter)
 {
 }
diff --git a/Userland/Libraries/LibWeb/HTML/SubmitEvent.h b/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
index 79861def20..f9617682e8 100644
--- a/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
@@ -19,15 +19,15 @@ class SubmitEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(SubmitEvent, DOM::Event);
 
 public:
-    static WebIDL::ExceptionOr<JS::NonnullGCPtr<SubmitEvent>> create(JS::Realm&, DeprecatedFlyString const& event_name, SubmitEventInit const& event_init);
-    static WebIDL::ExceptionOr<JS::NonnullGCPtr<SubmitEvent>> construct_impl(JS::Realm&, DeprecatedFlyString const& event_name, SubmitEventInit const& event_init);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<SubmitEvent>> create(JS::Realm&, FlyString const& event_name, SubmitEventInit const& event_init);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<SubmitEvent>> construct_impl(JS::Realm&, FlyString const& event_name, SubmitEventInit const& event_init);
 
     virtual ~SubmitEvent() override;
 
     JS::GCPtr<HTMLElement> submitter() const { return m_submitter; }
 
 private:
-    SubmitEvent(JS::Realm&, DeprecatedFlyString const& event_name, SubmitEventInit const& event_init);
+    SubmitEvent(JS::Realm&, FlyString const& event_name, SubmitEventInit const& event_init);
 
     virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
diff --git a/Userland/Libraries/LibWeb/HTML/SubmitEvent.idl b/Userland/Libraries/LibWeb/HTML/SubmitEvent.idl
index e408c3d74f..83a47e8667 100644
--- a/Userland/Libraries/LibWeb/HTML/SubmitEvent.idl
+++ b/Userland/Libraries/LibWeb/HTML/SubmitEvent.idl
@@ -2,7 +2,7 @@
 #import <HTML/HTMLElement.idl>
 
 // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#submitevent
-[Exposed=Window]
+[Exposed=Window, UseNewAKString]
 interface SubmitEvent : Event {
     constructor(DOMString type, optional SubmitEventInit eventInitDict = {});