  {
      background-image: linear-gradient(yellow, red);
      height: 100px;
    }
  </style>

  <script src="/resources/testharness.js"></script>

  <script src="/resources/testharnessreport.js"></script>

  <div id="target"></div>

  <script>
  function startTesting()
  {

  var targetElement = document.getElementById("target");

    function verifyComputedStyle(property_name, specified_value, expected_value, description)
    {

    test(function()
      {

      targetElement.style.setProperty(property