diff --git a/Userland/Libraries/LibWeb/HTML/EventNames.h b/Userland/Libraries/LibWeb/HTML/EventNames.h
index f9cb286a64..dda9ee49aa 100644
--- a/Userland/Libraries/LibWeb/HTML/EventNames.h
+++ b/Userland/Libraries/LibWeb/HTML/EventNames.h
@@ -105,6 +105,7 @@ namespace Web::HTML::EventNames {
     __ENUMERATE_HTML_EVENT(statechange)              \
     __ENUMERATE_HTML_EVENT(storage)                  \
     __ENUMERATE_HTML_EVENT(submit)                   \
+    __ENUMERATE_HTML_EVENT(success)                  \
     __ENUMERATE_HTML_EVENT(suspend)                  \
     __ENUMERATE_HTML_EVENT(timeupdate)               \
     __ENUMERATE_HTML_EVENT(toggle)                   \
diff --git a/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.cpp b/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.cpp
index 1f8264eeb8..aeadb43745 100644
--- a/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.cpp
+++ b/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.cpp
@@ -1,11 +1,13 @@
 /*
  * Copyright (c) 2024, Shannon Booth <shannon@serenityos.org>
+ * Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include <LibWeb/Bindings/IDBRequestPrototype.h>
 #include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/HTML/EventNames.h>
 #include <LibWeb/IndexedDB/IDBRequest.h>
 
 namespace Web::IndexedDB {
@@ -25,4 +27,16 @@ void IDBRequest::initialize(JS::Realm& realm)
     WEB_SET_PROTOTYPE_FOR_INTERFACE(IDBRequest);
 }
 
+// https://w3c.github.io/IndexedDB/#dom-idbrequest-onsuccess
+void IDBRequest::set_onsuccess(WebIDL::CallbackType* event_handler)
+{
+    set_event_handler_attribute(HTML::EventNames::success, event_handler);
+}
+
+// https://w3c.github.io/IndexedDB/#dom-idbrequest-onsuccess
+WebIDL::CallbackType* IDBRequest::onsuccess()
+{
+    return event_handler_attribute(HTML::EventNames::success);
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.h b/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.h
index b740a299ba..858933c5fd 100644
--- a/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.h
+++ b/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2024, Shannon Booth <shannon@serenityos.org>
+ * Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -17,6 +18,9 @@ class IDBRequest : public DOM::EventTarget {
 public:
     virtual ~IDBRequest() override;
 
+    void set_onsuccess(WebIDL::CallbackType*);
+    WebIDL::CallbackType* onsuccess();
+
 protected:
     explicit IDBRequest(JS::Realm&);
 
diff --git a/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.idl b/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.idl
index dc6b43edf5..934fb4ed62 100644
--- a/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.idl
+++ b/Userland/Libraries/LibWeb/IndexedDB/IDBRequest.idl
@@ -10,7 +10,7 @@ interface IDBRequest : EventTarget {
     [FIXME] readonly attribute IDBRequestReadyState readyState;
 
     // Event handlers:
-    [FIXME] attribute EventHandler onsuccess;
+    attribute EventHandler onsuccess;
     [FIXME] attribute EventHandler onerror;
 };