web-animations/timing-model/animations/update-playback-rate-zero-ref.html

<!DOCTYPE html>
<title>Reference for update playback rate zero</title>
<style>
  #box {
    background: green;
    height: 40px;
    width: 40px;
  }
</style>
<body>
  <div id="box"></div>
  <p id="notes">
    This test creates a running animation and halts its playback rate
    part way through. If the box transitions to red the test fails.
  </p>
</body>