testing/web-platform/tests/longtask-timing/shared-renderer/longtask-in-new-window.html

   1 <!DOCTYPE HTML>
   2 <meta charset=utf-8>
   3 <title>LongTask Timing: long task in another window</title>
   4 <body>
   5
   6 <script src="/resources/testharness.js"></script>
   7 <script src="/resources/testharnessreport.js"></script>
   8
   9 <script>
  10 /* This test should pass even when windows share a single renderer process.
  11   This window opens a new window which contains a longtask. We test that the
  12   longtask from the new window is not observed by the observer of this window. */
  13 async_test(t => {
  14   assert_precondition(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
  15   const observer = new PerformanceObserver(
  16       t.step_func(function (entryList) {
  17           const entries = entryList.getEntries();
  18           let markFound = false;
  19           for (let i = 0; i < entries.length; ++i) {
  20             const entry = entries[i];
  21             // We do not expect to observe longtasks but the work being made in this window may produce a longtask.
  22             assert_true(entry.entryType === 'longtask' ||
  23               entry.entryType === 'mark');
  24             if (entry.entryType === 'mark') {
  25               markFound = true;
  26               continue;
  27             }
  28             // If a longtask is observed, it must come from this window.
  29             assert_equals(entry.name, 'self');
  30           }
  31           // If we found the mark, then the other window longtask is done.
  32           if (markFound)
  33             t.done();
  34       })
  35   );
  36   observer.observe({entryTypes: ['mark', 'longtask']});
  37
  38   window.onload = () => {
  39     // Open a window with a longtask.
  40     const other_window = window.open('resources/frame-with-longtask.html');
  41     window.addEventListener('message', t.step_func(e => {
  42       // Do a mark (after the other window's longtask) to fire the callback.
  43       self.performance.mark('mark1');
  44     }));
  45   };
  46 }, 'A longtask in a frame from window.open is not reported in original frame');
  47 </script>
  48 </body>