testing/web-platform/tests/workers/SharedWorkerPerformanceNow.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <title>window.performance.now in shared workers</title>
   5 <script src="/resources/testharness.js"></script>
   6 <script src="/resources/testharnessreport.js"></script>
   7 </head>
   8 <body>
   9 <script>
  10 async_test(function(t) {
  11     const worker = new SharedWorker('support/WorkerSendingPerformanceNow.js');
  12     worker.port.onmessage = t.step_func(event => {
  13         const results = event.data;
  14         assert_true(results.length == 4);
  15         assert_equals(results[0], 'undefined',
  16           'workerStart not defined on the Worker object');
  17         assert_equals(results[1], 'object', 'self.performance is defined');
  18         assert_equals(results[2], 'function', 'self.performance.now is defined');
  19         assert_greater_than(results[3], 0, 'Time in the worker should be positive');
  20         assert_greater_than(window.performance.now(), results[3], 'Time in the worker should be before the current time in the main document');
  21         setupIframe();
  22     });
  23     window.iframeStartTime = 0;
  24     window.test_iframe = function(event) {
  25         const workerTime = event.data[3];
  26         assert_greater_than(workerTime, window.iframeStartTime,
  27             'Time since origin time should be greater in the shared worker than the iframe');
  28         t.done();
  29     }
  30     function setupIframe() {
  31         const iframe = document.createElement('iframe');
  32         document.body.appendChild(iframe);
  33         const script = iframe.contentWindow.document.createElement('script');
  34         script.innerHTML =
  35             'window.top.iframeStartTime = window.performance.now();' +
  36             'const worker = new SharedWorker("support/WorkerSendingPerformanceNow.js");' +
  37             'worker.port.onmessage = function(event) {' +
  38             '    window.top.test_iframe(event);' +
  39             '};' +
  40             'worker.port.postMessage("");';
  41         iframe.contentWindow.document.body.appendChild(script);
  42     }
  43     worker.port.postMessage('');
  44 }, 'performance.now() exists in shared workers and reports reasonable times');
  45 </script>
  46 </body>
  47 </html>