diff --git a/Userland/Libraries/LibWeb/CSS/FontFaceSet.cpp b/Userland/Libraries/LibWeb/CSS/FontFaceSet.cpp
index c82678c0145..281f744eb52 100644
--- a/Userland/Libraries/LibWeb/CSS/FontFaceSet.cpp
+++ b/Userland/Libraries/LibWeb/CSS/FontFaceSet.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
+ * Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -11,6 +12,7 @@
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/CSS/FontFace.h>
 #include <LibWeb/CSS/FontFaceSet.h>
+#include <LibWeb/HTML/EventNames.h>
 #include <LibWeb/WebIDL/Promise.h>
 
 namespace Web::CSS {
@@ -83,6 +85,18 @@ void FontFaceSet::clear()
     m_set_entries->set_clear();
 }
 
+// https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-onloading
+void FontFaceSet::set_onloading(WebIDL::CallbackType* event_handler)
+{
+    set_event_handler_attribute(HTML::EventNames::loading, event_handler);
+}
+
+// https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-onloading
+WebIDL::CallbackType* FontFaceSet::onloading()
+{
+    return event_handler_attribute(HTML::EventNames::loading);
+}
+
 // https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-load
 JS::ThrowCompletionOr<JS::NonnullGCPtr<JS::Promise>> FontFaceSet::load(String const&, String const&)
 {
diff --git a/Userland/Libraries/LibWeb/CSS/FontFaceSet.h b/Userland/Libraries/LibWeb/CSS/FontFaceSet.h
index 4a4e7dc7b6f..db385a9a14a 100644
--- a/Userland/Libraries/LibWeb/CSS/FontFaceSet.h
+++ b/Userland/Libraries/LibWeb/CSS/FontFaceSet.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
+ * Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -29,6 +30,10 @@ public:
     JS::NonnullGCPtr<FontFaceSet> add(JS::Handle<FontFace>);
     bool delete_(JS::Handle<FontFace>);
     void clear();
+
+    void set_onloading(WebIDL::CallbackType*);
+    WebIDL::CallbackType* onloading();
+
     JS::ThrowCompletionOr<JS::NonnullGCPtr<JS::Promise>> load(String const& font, String const& text);
 
     JS::NonnullGCPtr<JS::Promise> ready() const;
diff --git a/Userland/Libraries/LibWeb/CSS/FontFaceSet.idl b/Userland/Libraries/LibWeb/CSS/FontFaceSet.idl
index 3a379bf2f47..36c703f4354 100644
--- a/Userland/Libraries/LibWeb/CSS/FontFaceSet.idl
+++ b/Userland/Libraries/LibWeb/CSS/FontFaceSet.idl
@@ -25,7 +25,7 @@ interface FontFaceSet : EventTarget {
     undefined clear();
 
     // events for when loading state changes
-    [FIXME] attribute EventHandler onloading;
+    attribute EventHandler onloading;
     [FIXME] attribute EventHandler onloadingdone;
     [FIXME] attribute EventHandler onloadingerror;
 
diff --git a/Userland/Libraries/LibWeb/HTML/EventNames.h b/Userland/Libraries/LibWeb/HTML/EventNames.h
index 40ebc6e7bac..3255dac5687 100644
--- a/Userland/Libraries/LibWeb/HTML/EventNames.h
+++ b/Userland/Libraries/LibWeb/HTML/EventNames.h
@@ -65,6 +65,7 @@ namespace Web::HTML::EventNames {
     __ENUMERATE_HTML_EVENT(loadend)                  \
     __ENUMERATE_HTML_EVENT(loadeddata)               \
     __ENUMERATE_HTML_EVENT(loadedmetadata)           \
+    __ENUMERATE_HTML_EVENT(loading)                  \
     __ENUMERATE_HTML_EVENT(loadstart)                \
     __ENUMERATE_HTML_EVENT(message)                  \
     __ENUMERATE_HTML_EVENT(messageerror)             \