ref {
    background-color: blue;
    height: 100px;
    width: 100px;
  }
  #test {
    margin-bottom: 1px;
    transition-duration: 4s;
    transition-property: margin-bottom;
    transition-timing-function: linear;
  }
</style>
<body>
  <p id="test">Click blue square below. Test passes if the blue square moves down gradually not immediately until it stops.</p>
  <div id="ref"></div>
  <script>
    (function() {
      var ref = document.querySelector("#ref");
      ref.addEventListener("click", function(e