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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <html> |
| 3 <head> |
| 4 <meta charset="utf-8"> |
| 5 <title>performance.now() time origin</title> |
| 6 <meta name="author" title="JosephPecoraro" href="mailto:joepeck@webkit.org"> |
| 7 <meta name="assert" content="Time origin in Worker should be Worker's moment of
creation."> |
| 8 <link rel="help" href="https://w3c.github.io/hr-time/#time-origin-1"> |
| 9 <script src="/resources/testharness.js"></script> |
| 10 <script src="/resources/testharnessreport.js"></script> |
| 11 <script> |
| 12 async_test(function(t) { |
| 13 this.step_timeout(function() { |
| 14 var workerScript = 'postMessage({now: performance.now()})'; |
| 15 var blob = new Blob([workerScript]); |
| 16 var worker = new Worker(URL.createObjectURL(blob)); |
| 17 var windowWorkerCreationTime = performance.now(); |
| 18 worker.addEventListener("message", t.step_func_done(function(event) { |
| 19 var workerNow = event.data.now; |
| 20 |
| 21 // We waited 1s to spawn the worker. So verify the worker timestamp is at
least less then 0.5 seconds. |
| 22 assert_less_than(workerNow, 500, "worker performance.now() must be very cl
ose to its creation time"); |
| 23 |
| 24 // We waited 1s to spawn the worker. Window's now is ~1000, Worker's now w
ill be much lower. |
| 25 assert_greater_than(windowWorkerCreationTime - workerNow, 500, "window's t
ime origin must be before worker's time origin"); |
| 26 })); |
| 27 }, 1000); |
| 28 }, 'Worker time origin is approximately its creation time'); |
| 29 </script> |
| 30 </head> |
| 31 <body> |
| 32 <h1>Description</h1> |
| 33 <p>This test validates that a Worker's time origin is its moment of creation and
differs from its spawner's.</p> |
| 34 <div id="log"></div> |
| 35 </body> |
| 36 </html> |
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Chromium Code Reviews
Issue 2675133002:
Import wpt@97e16bef6d6599ae805521e2007a9430a12aa144 (Closed)
