 {
    float: left;
  }
  #ref {
    height: 100px;
    margin-right: 1px;
    transition-duration: 4s;
    transition-property: margin-right;
    transition-timing-function: linear;
    width: 1px;
  }
  #test {
    background-color: blue;
    height: 100px;
    width: 100px;
  }
</style>
<body>
  <p>Click the blue square below. Test passes if the blue square moves gradually not immediately from left to right until it stops.</p>
  <div id="ref"></div>
  <div id="test"></div>
  <script>
    (function() {
  