<!DOCTYPE html>
    <head>
        <script type="text/javascript">
            function runTest() {
                var mathmlNS = "http://www.w3.org/1998/Math/MathML";
                var node = document.createElementNS(mathmlNS, "mspace");
				node.setAttribute("width","100px");
				node.setAttribute("height","100px");
				node.setAttribute("mathbackground","red");
				document.getElementById('testMenclose').appendChild(node);
            }
        </script>
    </head>
    <body onload="runTest()">
        <p>
            <math><menclose id="testMenclose" notation="box"></menclose></math>
		</p>
    </body>
</html>