#import #import [Exposed=(Window), UseNewAKString] interface Worker : EventTarget { constructor(DOMString scriptURL, optional WorkerOptions options = {}); undefined terminate(); undefined postMessage(any message, optional any transfer); attribute EventHandler onmessage; attribute EventHandler onmessageerror; }; dictionary WorkerOptions { USVString type = "classic"; USVString credentials = "same-origin"; DOMString name = ""; };