css/css-animations/animation-display-manual.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Animations Test: animation - display</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="reviewer" title="Zhiqiang Zhang" href="mailto:zhiqiang.zhang@intel.com"> <!-- 2015-05-07 -->
<link rel="help" href="https://drafts.csswg.org/css-animations-1/#animation-name">
<link rel="help" href="https://drafts.csswg.org/css-animations-1/#animation-duration">
<link rel="help" href="https://drafts.csswg.org/css-animations-1/#animations">
<meta name="flags" content="animated">
<meta name="assert" content="Check that setting 'display' property to 'none' terminates
                             running animation applied to the element, and updating 'display'
                             property to a value other than 'none' will start the animation.">
<style>
  div {
    animation-name: sample;
    animation-duration: 10s;

    background-color: blue;
    height: 100px;
    width: 100px;
    position: relative;
  }

  @keyframes sample {
    from {
      left: 150px;
    }
    to {
      left: 0px;
    }
  }
</style>
<body>
  <p>
    Test passes if there is a filled blue square with 'Filler Text',
    which moves from right to left twice.
  </p>
  <div>Filler Text</div>
  <script>
    var div = document.getElementsByTagName("div");

    setTimeout(function() {
      div[0].style.display = "none";
    }, 5000);

    setTimeout(function() {
      div[0].style.display = "block";
    }, 8000);
  </script>
</body>