-tb;
    }

  body
    {
      writing-mode: sideways-lr;
    }

  div
    {
      background-color: teal;
      height: 100px;
      width: 100px;
    }

  h1#second-test-condition
    {
      background-color: red;
      color: yellow;
    }
  </style>

  <script>
  function verifyComputedValueDocRoot()
  {
  if(getComputedStyle(document.documentElement)["writing-mode"] == "horizontal-tb")
    {
    document.getElementById("second-test-condition").style.display = "none";
    };

    /*
    If the computed