request-animation-frame-within-callback.html

<!DOCTYPE html>
<title>Tests adding one callback within another</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<script>
  async_test(t => {
    var sameFrame;
    window.requestAnimationFrame(function() {
      sameFrame = true;
    });
    window.requestAnimationFrame(function() {
      window.requestAnimationFrame(function() {
        t.step(function() {
          assert_false(sameFrame);
        });
      });
      requestAnimationFrame(function() {
        t.done();
      });
    });
    window.requestAnimationFrame(function() {
      sameFrame = false;
    });
  }, "Test adding one rAF callback within another");
</script>

chromium/third_party/blink/web_tests/fast/animation/request-animation-frame-within-callback.html