Tests that DedicatedWorkerGlobalScope's prototype chain is correct. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". DedicatedWorkerGlobalScope.prototype.toString() === "[object DedicatedWorkerGlobalScope]": true Object.getPrototypeOf(DedicatedWorkerGlobalScope.prototype) === WorkerGlobalScope.prototype: true WorkerGlobalScope.prototype.toString() === "[object WorkerGlobalScope]": true Object.getPrototypeOf(WorkerGlobalScope.prototype) === EventTarget.prototype: true PASS successfullyParsed is true TEST COMPLETE