     height: 200px;
    }
  </style>

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

  <script>
  function startTesting()
  {

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

    function verifyComputedStyle(property_name, specified_value, expected_value)
    {

    test(function()
      {

      targetElement.style.setProperty(property_name, specified_value);

      assert_equals(getComputedStyle(targetElement)[property_name], expected_value);

      }, `testing ${property_name}: ${specified_value}`);
    }

    ver