css/css-animations/animation-timing-function-009-manual.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Animations Test: animation-timing-function - steps with parameters (<number>, start)</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/#animation-fill-mode">
<link rel="help" href="https://drafts.csswg.org/css-animations-1/#animation-timing-function">
<meta name="flags" content="animated">
<meta name="assert" content="When animation-timing-function is set to steps with paramenters
                             (<number>, start), animation will be defined by the number that divides
                             the domain of operation into equally size intervals, evey time the changes
                             happens at the start of the interval.">
<style>
  div {
    float: left;
    height: 100px;
    width: 100px;
    position: absolute;
  }

  #test-step-start {
    animation-name: sample;
    animation-duration: 10s;
    animation-fill-mode: forwards;
    animation-timing-function: steps(4, start);

    background-color: blue;
  }

  #ref-1 {
    background-color: yellow;
    left: 200px;
  }

  #ref-2 {
    background-color: green;
    left: 100px;
  }

  #ref-3 {
    background-color: red;
    left: 0px;
  }

  @keyframes sample {
    from {
      left: 400px;
    }
    to {
      left: 0px;
    }
  }
</style>
<body>
  <p>
    Test passes if there are a filled square with 'Filler Text',
    which jumps three times from right to left and orderly covers
    the filled YELLOW, GREEN and RED squares.
  </p>
  <div id="ref-1"></div>
  <div id="ref-2"></div>
  <div id="ref-3"></div>
  <div id="test-step-start">Filler Text</div>
</body>