
PASS ServiceWorkerGlobalScope: ExtendableMessageEvent Constructor 
PASS no initializer specified 
PASS `bubbles` is specified 
PASS `cancelable` is specified 
PASS `data` is specified 
PASS `origin` is specified 
PASS `lastEventId` is specified 
PASS `source` is specified 
PASS `ports` is specified 
PASS all initial values are specified