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Test Info:

<html class="test-wait">
<head>
<script type="text/javascript">
function boom()
{
function x()
{
document.removeEventListener("DOMAttrModified", x);
document.execCommand("backcolor", false, "green");
}
document.getElementById("td").focus();
document.addEventListener("DOMAttrModified", x);
try {
document.execCommand("subscript", false, null);
} catch(e) {
}
document.removeEventListener("DOMAttrModified", x);
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body contenteditable="true" onload="setTimeout(boom, 30);">
<table><tbody contenteditable="false"><tr><td contenteditable="true" id="td"></td></tr></tbody></table>
</body>
</html>