Fields

@:optionaloptionalports:Null<Array<MessagePort>>

@:optionaloptionalorigin:Null<String>

@:optionaloptionallastEventId:Null<String>

@:optionaloptionaldata:Null<Dynamic>

@:optionaloptionalcomposed:Null<Bool>

@:optionaloptionalcancelable:Null<Bool>

@:optionaloptionalbubbles:Null<Bool>