File: update-playback-rate-zero.html

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<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="UTF-8">
<title>Update playback rate zero</title>
<link rel="match" href="update-playback-rate-zero-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="../../testcommon.js"></script>
<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>
<script>
  onload = async function() {
    const box = document.getElementById('box');
    const duration = 2000;
    const anim =
        box.animate({ bacground: [ 'green', 'red' ] },
                    { duration: duration, easing: 'steps(2, jump-none)' });
    anim.ready.then(() => {
      const startTime = anim.timeline.currentTime;
      waitForAnimationFrames(2).then(() => {
        anim.updatePlaybackRate(0);
        anim.ready.then(() => {
          const checkIfDone = () => {
            if (anim.timeline.currentTime - startTime > duration / 2)
              takeScreenshot();
            else
              requestAnimationFrame(checkIfDone);
          };
          requestAnimationFrame(checkIfDone);
        });
      });
    });
  };
</script>