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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
<head><script type="text/javascript">
<![CDATA[
function boom() {
const HTML_NS = "http://www.w3.org/1999/xhtml";
var tr4 = document.createElementNS(HTML_NS, 'tr');
document.getElementById('tbody1').appendChild(tr4);
var span1 = document.createElementNS(HTML_NS, 'td');
tr4.insertBefore(span1, null);
document.documentElement.removeAttribute("class");
}
function ol(e) {
window.removeEventListener("load", ol);
setTimeout(boom, 400);
}
window.addEventListener("load", ol);
]]>
</script>
</head>
<body><table><tbody id="tbody1"><tr><td rowspan="0"></td></tr></tbody></table></body>
</html>