diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index 89e7a041e5..550a96e146 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -29,6 +29,7 @@ set(SOURCES
     Crypto/CryptoKey.cpp
     Crypto/SubtleCrypto.cpp
     CSS/Angle.cpp
+    CSS/AnimationEvent.cpp
     CSS/CalculatedOr.cpp
     CSS/Clip.cpp
     CSS/CSS.cpp
diff --git a/Userland/Libraries/LibWeb/CSS/AnimationEvent.cpp b/Userland/Libraries/LibWeb/CSS/AnimationEvent.cpp
new file mode 100644
index 0000000000..6ed52600d5
--- /dev/null
+++ b/Userland/Libraries/LibWeb/CSS/AnimationEvent.cpp
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024, Matthew Olsson <mattco@serenityos.org>.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/CSS/AnimationEvent.h>
+
+namespace Web::CSS {
+
+JS::NonnullGCPtr<AnimationEvent> AnimationEvent::create(JS::Realm& realm, FlyString const& type, AnimationEventInit const& event_init)
+{
+    return realm.heap().allocate<AnimationEvent>(realm, realm, type, event_init);
+}
+
+WebIDL::ExceptionOr<JS::NonnullGCPtr<AnimationEvent>> AnimationEvent::construct_impl(JS::Realm& realm, FlyString const& type, AnimationEventInit const& event_init)
+{
+    return create(realm, type, event_init);
+}
+
+AnimationEvent::AnimationEvent(JS::Realm& realm, FlyString const& type, AnimationEventInit const& event_init)
+    : DOM::Event(realm, type, event_init)
+    , m_animation_name(event_init.animation_name)
+    , m_elapsed_time(event_init.elapsed_time)
+    , m_pseudo_element(event_init.pseudo_element)
+{
+}
+
+void AnimationEvent::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::AnimationEventPrototype>(realm, "AnimationEvent"_fly_string));
+}
+
+}
diff --git a/Userland/Libraries/LibWeb/CSS/AnimationEvent.h b/Userland/Libraries/LibWeb/CSS/AnimationEvent.h
new file mode 100644
index 0000000000..d3986f2cf5
--- /dev/null
+++ b/Userland/Libraries/LibWeb/CSS/AnimationEvent.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2024, Matthew Olsson <mattco@serenityos.org>.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/Bindings/PlatformObject.h>
+#include <LibWeb/DOM/Event.h>
+
+namespace Web::CSS {
+
+// https://www.w3.org/TR/css-animations-1/#dictdef-animationeventinit
+struct AnimationEventInit : public DOM::EventInit {
+    FlyString animation_name { ""_fly_string };
+    double elapsed_time { 0.0 };
+    FlyString pseudo_element { ""_fly_string };
+};
+
+// https://www.w3.org/TR/css-animations-1/#animationevent
+class AnimationEvent : public DOM::Event {
+    WEB_PLATFORM_OBJECT(AnimationEvent, DOM::Event);
+
+public:
+    [[nodiscard]] static JS::NonnullGCPtr<AnimationEvent> create(JS::Realm&, FlyString const& type, AnimationEventInit const& event_init = {});
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<AnimationEvent>> construct_impl(JS::Realm&, FlyString const& type, AnimationEventInit const& event_init);
+
+    virtual ~AnimationEvent() override = default;
+
+    FlyString const& animation_name() const { return m_animation_name; }
+    double elapsed_time() const { return m_elapsed_time; }
+    FlyString const& pseudo_element() const { return m_pseudo_element; }
+
+private:
+    AnimationEvent(JS::Realm&, FlyString const& type, AnimationEventInit const& event_init);
+
+    virtual void initialize(JS::Realm&) override;
+
+    // https://www.w3.org/TR/css-animations-1/#dom-animationevent-animationname
+    FlyString m_animation_name {};
+
+    // https://www.w3.org/TR/css-animations-1/#dom-animationevent-elapsedtime
+    double m_elapsed_time { 0.0 };
+
+    // https://www.w3.org/TR/css-animations-1/#dom-animationevent-pseudoelement
+    FlyString m_pseudo_element {};
+};
+
+}
diff --git a/Userland/Libraries/LibWeb/CSS/AnimationEvent.idl b/Userland/Libraries/LibWeb/CSS/AnimationEvent.idl
new file mode 100644
index 0000000000..d14452af39
--- /dev/null
+++ b/Userland/Libraries/LibWeb/CSS/AnimationEvent.idl
@@ -0,0 +1,17 @@
+#import <DOM/Event.idl>
+
+// https://www.w3.org/TR/css-animations-1/#animationevent
+[Exposed=Window]
+interface AnimationEvent : Event {
+  constructor(CSSOMString type, optional AnimationEventInit animationEventInitDict = {});
+  readonly attribute CSSOMString animationName;
+  readonly attribute double elapsedTime;
+  readonly attribute CSSOMString pseudoElement;
+};
+
+// https://www.w3.org/TR/css-animations-1/#dictdef-animationeventinit
+dictionary AnimationEventInit : EventInit {
+  CSSOMString animationName = "";
+  double elapsedTime = 0.0;
+  CSSOMString pseudoElement = "";
+};
diff --git a/Userland/Libraries/LibWeb/idl_files.cmake b/Userland/Libraries/LibWeb/idl_files.cmake
index 9499daae1d..7039a11b54 100644
--- a/Userland/Libraries/LibWeb/idl_files.cmake
+++ b/Userland/Libraries/LibWeb/idl_files.cmake
@@ -11,6 +11,7 @@ libweb_js_bindings(Clipboard/Clipboard)
 libweb_js_bindings(Crypto/Crypto)
 libweb_js_bindings(Crypto/CryptoKey)
 libweb_js_bindings(Crypto/SubtleCrypto)
+libweb_js_bindings(CSS/AnimationEvent)
 libweb_js_bindings(CSS/CSSAnimation)
 libweb_js_bindings(CSS/CSSConditionRule)
 libweb_js_bindings(CSS/CSSFontFaceRule)