ound-position', 'background-size', 'background-repeat', 'background-origin', 'background-clip' and 'background-attachment' to that property's initial value, then assigns any explicit values specified for this layer in the declaration" />
    <style>
        #test {
            background: url("support/60x60-green.png") 40% / 10em gray round fixed border-box;
        }
    </style>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <b