<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Transitions Test: transition-timing-function - 'ease-in' equivalent to 'cubic-bezier(0.42, 0, 1.0, 1.0)'</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="author" title="Shiyou Tan" href="mailto:shiyoux.tan@intel.com">
<link rel="help" href="https://www.w3.org/TR/css-transitions-1/#transition-timing-function-property">
<meta name="assert" content="The 'transition-timing-function' property set 'ease-in' is equivalent to cubic-bezier(0.42, 0, 1.0, 1.0)">
<style>
  div {
    height: 100px;
    transition: width 2s;
    width: 100px;
  }
  #test1 {
    background-color: blue;
    transition-timing-function: ease-in;
  }
  #test2 {
    background-color: yellow;
    transition-timing-function: cubic-bezier(0.42, 0, 1.0, 1.0);
  }
</style>
<body>
  <p>Click the 'Start' button. Test passes if the width growth of blue square is <strong>equivalent</strong> to the yellow square.</p>
  <div id="test1"></div>
  <div id="test2"></div>
  <button>Start</button>
  <script>
    (function() {
      var button = document.querySelector("button");
      button.addEventListener("click", function(evt) {
        var test1 = document.querySelector("#test1"),
            test2 = document.querySelector("#test2");
        test1.setAttribute("style", "width: 300px");
        test2.setAttribute("style", "width: 300px");
      }, false);
    })();
  </script>
</body>