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diff --git a/testing/web-platform/tests/interfaces/css-transitions.idl b/testing/web-platform/tests/interfaces/css-transitions.idl
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+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Transitions Level 1 (https://drafts.csswg.org/css-transitions-1/)
+
+[Exposed=Window]
+interface TransitionEvent : Event {
+  constructor(CSSOMString type, optional TransitionEventInit transitionEventInitDict = {});
+  readonly attribute CSSOMString propertyName;
+  readonly attribute double elapsedTime;
+  readonly attribute CSSOMString pseudoElement;
+};
+
+dictionary TransitionEventInit : EventInit {
+  CSSOMString propertyName = "";
+  double elapsedTime = 0.0;
+  CSSOMString pseudoElement = "";
+};
+
+partial interface mixin GlobalEventHandlers {
+  attribute EventHandler ontransitionrun;
+  attribute EventHandler ontransitionstart;
+  attribute EventHandler ontransitionend;
+  attribute EventHandler ontransitioncancel;
+};