| Index: Source/core/dom/ErrorEvent.idl | 
| diff --git a/Source/core/dom/ErrorEvent.idl b/Source/core/dom/ErrorEvent.idl | 
| index 5941bfec62c4ca05b42b7af4c2acaed617f0f931..33f02390d8d18a1a577c36fcf003abd81ef4e192 100644 | 
| --- a/Source/core/dom/ErrorEvent.idl | 
| +++ b/Source/core/dom/ErrorEvent.idl | 
| @@ -35,5 +35,6 @@ | 
| [InitializedByEventConstructor] readonly attribute DOMString filename; | 
| [InitializedByEventConstructor] readonly attribute unsigned long lineno; | 
| [InitializedByEventConstructor] readonly attribute unsigned long colno; | 
| +    [InitializedByEventConstructor, Custom, Unserializable] readonly attribute any error; | 
| }; | 
|  | 
|  |