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<head>
<script>
function foo()
{
var div = document.getElementById("div");
div.appendChild(div.firstChild);
var td = document.getElementById("td");
td.setAttribute('rowspan', -2);
}
</script>
</head>
<body onload="foo()">
<mtable>↩ <mtr>↩ <mtd id="td"><mi>y</mi></mtd>↩ </mtr>↩ </mtable>
</math></div>
</body>
</html>