arnessreport.js" type="text/javascript"></script>
    <style id="styleElement">
        @import url("support/a-green.css");
    </style>
</head>
<body>
<div id="log"></div>
<script type="text/javascript">
    var sheet = document.getElementById("styleElement").sheet;
    test(function() {
        assert_equals(sheet.cssRules.length, 1);
        assert_throws_dom("HierarchyRequestError", function() { sheet.insertRule("p { color: green; }"); });
        assert_equals(sheet.cssRules.length, 1);
    }, "insertR