<!doctype html>
<html class="reftest-wait">
  <head>
    <title>Bug 1239889</title>
  </head>
  <body>
  </body>
  <script>
    var div = document.createElement('div');
    var effect = new KeyframeEffect(div, { opacity: [0, 1] });
    requestAnimationFrame(() => {
      document.body.appendChild(div);
      document.documentElement.classList.remove("reftest-wait");
    });
  </script>
</html>
