1 files changed, 20 insertions, 0 deletions
diff --git a/components/script/dom/webidls/TransitionEvent.webidl b/components/script/dom/webidls/TransitionEvent.webidl
new file mode 100644
index 00000000000..f1e284ac02d
--- /dev/null
+++ b/components/script/dom/webidls/TransitionEvent.webidl
@@ -0,0 +1,20 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+ * For more information on this interface please see
+ * https://dom.spec.whatwg.org/#event
+ */
+
+[Constructor(DOMString type, optional TransitionEventInit transitionEventInitDict)]
+interface TransitionEvent : Event {
+  readonly attribute DOMString          propertyName;
+  readonly attribute float              elapsedTime;
+  readonly attribute DOMString          pseudoElement;
+};
+
+dictionary TransitionEventInit : EventInit {
+  DOMString propertyName = "";
+  float elapsedTime = 0.0;
+  DOMString pseudoElement = "";
+};