third_party/web_platform_tests/html/webappapis/animation-frames/same-dispatch-time.html

<!doctype html>
<html>
  <head>
    <title>requestAnimationFrame in queue get the same timestamp</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <link rel="help" href="http://w3c.github.io/animation-timing/#dfn-invoke-callbacks-algorithm"/>
  </head>
  <body>
    <div id="log"></div>
    <script>
      test(function (t) {
        var a = 0, b = 0;

        /* REASONING:
        * These two methods that will be called with a timestamp. Because
        * they execute right after eachother, they're added to the same
        * queue and SHOULD be timestamped with the same value.
        */
        window.requestAnimationFrame(function() { a = arguments[0]; });
        window.requestAnimationFrame(function() { b = arguments[0]; });

        setTimeout(function() {
            assert_true(a != 0);
            assert_true(b != 0);
            assert_true(a == b);
        }, 100);
      }, "requestAnimationFrame will timestamp events in the same queue with the same time");
    </script>
  </body>
</html>