1 files changed, 2 insertions, 4 deletions
diff --git a/dom/webidl/EventHandler.webidl b/dom/webidl/EventHandler.webidl
index c76dfe211..6691ca224 100644
--- a/dom/webidl/EventHandler.webidl
+++ b/dom/webidl/EventHandler.webidl
@@ -133,10 +133,8 @@ interface GlobalEventHandlers {
            attribute EventHandler onanimationstart;
            attribute EventHandler ontransitioncancel;
            attribute EventHandler ontransitionend;
-           // We will ship transitionrun and transitionstart events
-           // on Firefox 53. (For detail, see bug 1324985)
-//           attribute EventHandler ontransitionrun;
-//           attribute EventHandler ontransitionstart;
+           attribute EventHandler ontransitionrun;
+           attribute EventHandler ontransitionstart;
 
            // CSS-Animation and CSS-Transition legacy handlers.
            // This handler isn't standard.