testing/web-platform/tests/event-timing/toJSON.html

   1 <!DOCTYPE HTML>
   2 <meta charset=utf-8>
   3 <title>Event Timing: toJSON</title>
   4 <body>
   5 <script src=/resources/testharness.js></script>
   6 <script src=/resources/testharnessreport.js></script>
   7 <script src=/resources/testdriver.js></script>
   8 <script src=/resources/testdriver-vendor.js></script>
   9 <script src=resources/event-timing-test-utils.js></script>
  10 <button id='button'>Generate a 'click' event</button>
  11 <script>
  12   async_test(function (t) {
  13     assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');
  14     const observer = new PerformanceObserver(
  15       t.step_func_done(function(entryList) {
  16         const entry = entryList.getEntries()[0];
  17         assert_equals(typeof(entry.toJSON), 'function');
  18         const json = entry.toJSON();
  19         assert_equals(typeof(json), 'object');
  20         const keys = [
  21           // PerformanceEntry
  22           'name',
  23           'entryType',
  24           'startTime',
  25           'duration',
  26           // PerformanceEventTiming
  27           'processingStart',
  28           'processingEnd',
  29           'cancelable',
  30         ];
  31         for (const key of keys) {
  32           assert_equals(json[key], entry[key],
  33             'PerformanceEventTiming ${key} entry does not match its toJSON value');
  34         }
  35         assert_equals(json['target'], undefined, 'toJSON should not include target');
  36       })
  37     );
  38     observer.observe({type: 'event'});
  39     clickAndBlockMain('button');
  40   }, 'Test toJSON() in PerformanceEventTiming.');
  41 </script>
  42 </body>