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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <script src="https://rawgit.com/web-animations/web-animations-js/master/web-animations-next.min.js"></script>
</head>
<body>
  Using web animations polyfill
  <script>
    const animation = document.body.animate([{opacity: 0}, {opacity: 1}], 500)
    animation.onfinish = event => {
      console.log('onfinish', animation.playState)
    }
    animation.oncancel = event => {
      if(animation.playState === 'running') return;
      console.log('oncancel', animation.playState)
    }
  </script>
</body>
</html>
Output

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