#import [Exposed=(Window,Worker)] interface ErrorEvent : Event { constructor(DOMString type, optional ErrorEventInit eventInitDict = {}); readonly attribute DOMString message; readonly attribute USVString filename; readonly attribute unsigned long lineno; readonly attribute unsigned long colno; readonly attribute any error; }; dictionary ErrorEventInit : EventInit { DOMString message = ""; USVString filename = ""; unsigned long lineno = 0; unsigned long colno = 0; any error = null; };