File: effectively-infinite-timing-parameters.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>Starting an animation with an effectively infinite timing parameters
  </title>
</head>
<!-- crbug.com/400741639 -->
<body>
  <div id="target">test</div>
</body>
<script>
  async function raf(n) {
    return new Promise(resolve => {
      const tick = () => {
        if (--n) {
          requestAnimationFrame(tick);
        } else {
          resolve();
        }
      }
      requestAnimationFrame(tick);
    });
  };

  window.onload = async () => {
    const target = document.getElementById('target');
    const anim = target.animate([
        {"transform": "scale(2)"},
        {"transform": "none"}
      ], {
        duration: 95903184853313357582278077554606,
        iterationStart: 3.165661661777848e+19,
      });
    await anim.ready;
    await raf(5);
    document.documentElement.classList.remove('test-wait');
  };
</script>
</html>