js-self-profiling/concurrent-profilers.https.html

<!DOCTYPE html>
<html>
<head>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>
<body>
  <script>
    promise_test(async t => {
      const profiler_a = new Profiler({
        sampleInterval: 10,
        maxBufferSize: Number.MAX_SAFE_INTEGER,
      });

      const profiler_b = new Profiler({
        sampleInterval: 10,
        maxBufferSize: Number.MAX_SAFE_INTEGER,
      });

      const trace_b = await profiler_b.stop();
      const trace_a = await profiler_a.stop();
    }, 'concurrent profilers should be supported');
  </script>
</body>
</html>