File: set-timeline-undefined-progress.html

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<!DOCTYPE html>
<html class="test-wait">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Set timeline when effect end is infinite.
  </title>
  <!-- crbug.com/440368332 -->
</head>
<style>
  #target {
    background-color: green;
    width: 200px;
    height: 200px;
  }
</style>
<script>
</script>
<body>
  <div id="target"></div>
</body>
<script>
  window.onload = async () => {
    const anim =
        target.animate(null, { duration: 2000, iterations: Infinity });
    // Setting an infinite playback rate combined with a future start time, puts
    // current time infinitely in the past.
    anim.playbackRate = Number.MAX_VALUE;
    anim.startTime = performance.now() + 1000;
    // When setting a new timeline, we compute the current progress on the old
    // timeline in case we need to match the progress on the new timeline to
    // avoid a jump. In this case, current progress is:
    // currentTime / EffectEnd = -infinity / infinity = undefined.
    anim.timeline = null;
    requestAnimationFrame(() => {
      document.documentElement.classList.remove('test-wait');
    });
  }
</script>
</html>