diff --git a/karax/vdom.nim b/karax/vdom.nim
index 3f44673..d0ee5b5 100644
--- a/karax/vdom.nim
+++ b/karax/vdom.nim
@@ -97,6 +97,11 @@ type
                   ## passed (useful for on-the-fly text completions)
     onload, # img
 
+    ontransitioncancel,
+    ontransitionend,
+    ontransitionrun,
+    ontransitionstart
+
 macro buildLookupTables(): untyped =
   var a = newTree(nnkBracket)
   for i in low(VNodeKind)..high(VNodeKind):