| <!doctype html> |
| <html> |
| <head> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| <body> |
| <script> |
| const windowOrigin = performance.timeOrigin; |
| |
| test(() => { |
| // Use a 30ms cushion when comparing with Date() to account for inaccuracy. |
| const startTime = Date.now(); |
| assert_greater_than_equal(startTime + 30, windowOrigin, 'Date.now() should be at least as large as the window timeOrigin.'); |
| const startNow = performance.now(); |
| assert_less_than_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(function(event) { |
| const workerOrigin = event.data.timeOrigin; |
| assert_greater_than_equal(workerOrigin, windowOrigin + beforeWorkerCreation, 'Worker timeOrigin should be greater than the window timeOrigin.'); |
| const afterWorkerCreation = performance.now(); |
| assert_less_than_equal(workerOrigin - windowOrigin, afterWorkerCreation, 'Window and worker timeOrigins should be close.'); |
| })); |
| }, 'Window and worker timeOrigins are close when created one after another.'); |
| |
| async_test(function(t) { |
| this.step_timeout(function() { |
| const workerCreation = performance.now(); |
| const worker = new Worker(URL.createObjectURL(blob)); |
| worker.addEventListener('message', t.step_func_done(function(event) { |
| const workerOrigin = event.data.timeOrigin; |
| assert_greater_than_equal(workerOrigin - windowOrigin, 200, 'We waited 200ms to spawn the second worker, so its timeOrigin should be greater than that of the window.'); |
| })); |
| }, 200); |
| }, 'Window and worker timeOrigins differ when worker is created after a delay.'); |
| </script> |
| </body> |
| </html> |
