_equal(startTime, windowOrigin + startNow + 30, 'Date.now() should be close to window timeOrigin.');
}, 'Window timeOrigin is close to Date.now() when there is no system clock adjustment.');

// const workerScript = 'postMessage({timeOrigin: performance.timeOrigin})';
// const blob = new Blob([workerScript]);

// async_test(function(t) {
//   const beforeWorkerCreation = performance.now();
//   const worker = new Worker(URL.createObjectURL(blob));
//   worker.addEventListener('message', t.step_func_done(fun