tor-browser

window-worker-timeOrigin.window.js (1691B)

---

"use strict"
// https://w3c.github.io/hr-time/#time-origin

async_test(function(test) {
   // Cache global time before starting worker
   const globalTimeOrigin = performance.timeOrigin;
   const globalNowBeforeWorkerStart = performance.now();

   // Start worker and retrieve time
   const workerScript = "postMessage({timeOrigin: performance.timeOrigin, now: performance.now()})";
   const blob = new Blob([workerScript]);
   let worker = new Worker(URL.createObjectURL(blob));

   worker.addEventListener("message", test.step_func_done(function(event) {
       const workerTimeOrigin = event.data.timeOrigin;
       const workerNow = event.data.now;

       assert_not_equals(workerTimeOrigin, 0, "worker timeOrigin must not be 0");
       assert_not_equals(performance.timeOrigin, 0, "Document timeOrigin must not be 0");

       assert_equals(globalTimeOrigin, performance.timeOrigin, "timeOrigin should not be changed in same document mode");
       assert_less_than(globalTimeOrigin, workerTimeOrigin, "Document timeOrigin must be earlier than worker timeOrigin");

       // Document and worker's now() start from their respective timeOrigins.
       const timeDiff = workerTimeOrigin - globalTimeOrigin; // convert worker's time to Document time.
       assert_less_than(globalTimeOrigin + globalNowBeforeWorkerStart, globalTimeOrigin + timeDiff + workerNow, "Document old now is earlier than worker now.");

       // Comparing timing between Document and worker threads could be delicate as it relies on the thread implementation and could be subject to race conditions.
   }));
}, 'timeOrigin and now() should be correctly ordered between window and worker');