diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index f5c04f78c4..b2e36a510a 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -175,7 +175,6 @@ set(SOURCES
     HTML/Parser/StackOfOpenElements.cpp
     HTML/Scripting/ClassicScript.cpp
     HTML/Scripting/Script.cpp
-    HTML/SubmitEvent.cpp
     HTML/SyntaxHighlighter/SyntaxHighlighter.cpp
     HTML/TagNames.cpp
     HTML/WebSocket.cpp
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
index 5d9e3ef437..3c8e3d59d4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
@@ -59,7 +59,9 @@ void HTMLFormElement::submit_form(RefPtr<HTMLElement> submitter, bool from_submi
         if (submitter != this)
             submitter_button = submitter;
 
-        auto submit_event = SubmitEvent::create(EventNames::submit, submitter_button);
+        SubmitEventInit event_init {};
+        event_init.submitter = submitter_button;
+        auto submit_event = SubmitEvent::create(EventNames::submit, event_init);
         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
deleted file mode 100644
index fc63ef6ded..0000000000
--- a/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#include <LibWeb/HTML/HTMLElement.h>
-#include <LibWeb/HTML/SubmitEvent.h>
-
-namespace Web::HTML {
-
-NonnullRefPtr<SubmitEvent> SubmitEvent::create(const FlyString& event_name, RefPtr<HTMLElement> submitter)
-{
-    return adopt_ref(*new SubmitEvent(event_name, move(submitter)));
-}
-
-SubmitEvent::SubmitEvent(const FlyString& event_name, RefPtr<HTMLElement> submitter)
-    : DOM::Event(event_name)
-    , m_submitter(submitter)
-{
-}
-
-SubmitEvent::~SubmitEvent()
-{
-}
-
-RefPtr<HTMLElement> SubmitEvent::submitter() const
-{
-    return m_submitter;
-}
-
-}
diff --git a/Userland/Libraries/LibWeb/HTML/SubmitEvent.h b/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
index d8cbcd7246..54922b9a65 100644
--- a/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
@@ -6,22 +6,39 @@
 
 #pragma once
 
+#include <LibWeb/Bindings/HTMLElementWrapper.h>
 #include <LibWeb/DOM/Event.h>
+#include <LibWeb/HTML/HTMLElement.h>
 
 namespace Web::HTML {
 
+struct SubmitEventInit : public DOM::EventInit {
+    RefPtr<HTMLElement> submitter { nullptr };
+};
+
 class SubmitEvent final : public DOM::Event {
 public:
     using WrapperType = Bindings::SubmitEventWrapper;
 
-    static NonnullRefPtr<SubmitEvent> create(const FlyString& event_name, RefPtr<HTMLElement> submitter);
+    static NonnullRefPtr<SubmitEvent> create(FlyString const& event_name, SubmitEventInit const& event_init)
+    {
+        return adopt_ref(*new SubmitEvent(event_name, event_init));
+    }
+    static NonnullRefPtr<SubmitEvent> create_with_global_object(Bindings::WindowObject&, FlyString const& event_name, SubmitEventInit const& event_init)
+    {
+        return SubmitEvent::create(event_name, event_init);
+    }
 
-    virtual ~SubmitEvent() override;
+    virtual ~SubmitEvent() override = default;
 
-    RefPtr<HTMLElement> submitter() const;
+    RefPtr<HTMLElement> submitter() const { return m_submitter; }
 
 private:
-    SubmitEvent(const FlyString& event_name, RefPtr<HTMLElement> submitter);
+    SubmitEvent(FlyString const& event_name, SubmitEventInit const& event_init)
+        : DOM::Event(event_name, event_init)
+        , m_submitter(event_init.submitter)
+    {
+    }
 
     RefPtr<HTMLElement> m_submitter;
 };
diff --git a/Userland/Libraries/LibWeb/HTML/SubmitEvent.idl b/Userland/Libraries/LibWeb/HTML/SubmitEvent.idl
index c816ae663f..30254534eb 100644
--- a/Userland/Libraries/LibWeb/HTML/SubmitEvent.idl
+++ b/Userland/Libraries/LibWeb/HTML/SubmitEvent.idl
@@ -1,5 +1,11 @@
+#import <DOM/Event.idl>
+
 interface SubmitEvent : Event {
+    constructor(DOMString type, optional SubmitEventInit eventInitDict = {});
 
     readonly attribute HTMLElement? submitter;
-
+};
+
+dictionary SubmitEventInit : EventInit {
+   HTMLElement? submitter = null;
 };