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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml" class="test-wait">
<head>
<script>
function boom()
{
var math = document.getElementById("math");
var div = document.getElementById("div")
math.setAttribute("color", "g");
document.body.appendChild(div);
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="setTimeout(boom, 30);">
<div id="div">
<mo xmlns='http://www.w3.org/1998/Math/MathML'>+<math id="math"><mn>1</mn></math></mo>
</div>
</body>
</html>