audiocontext-getoutputtimestamp.html

<!DOCTYPE html>
<html>
  <head>
    <title>
      Testing AudioContext.getOutputTimestamp() method
    </title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/webaudio/resources/audit.js"></script>
  </head>
  <body>
    <script id="layout-test-code">
      let audit = Audit.createTaskRunner();

      audit.define('getoutputtimestamp-initial-values', function(task, should) {
        let context = new AudioContext;
        let timestamp = context.getOutputTimestamp();

        should(timestamp.contextTime, 'timestamp.contextTime').exist();
        should(timestamp.performanceTime, 'timestamp.performanceTime').exist();

        should(timestamp.contextTime, 'timestamp.contextTime')
            .beGreaterThanOrEqualTo(0);
        should(timestamp.performanceTime, 'timestamp.performanceTime')
            .beGreaterThanOrEqualTo(0);

        task.done();
      });

      audit.run();
    </script>
  </body>
</html>

chromium/third_party/blink/web_tests/external/wpt/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-getoutputtimestamp.html