erefore must be absolutized to 'px'." name="assert">

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

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

  <style>
  html, body
    {
      font-size: 16px;
      height: 570px;
    }

  div#target
    {
      background-color: yellow;
      background-image: url("support/cat.png");
      background-position: top center;
      background-repeat: no-repeat;
      background-size: 14% 50%; /* entirely arbitrary and random background-size values */
 