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Test Info:

<html>
<head>
<script>
function start () {
try { o1 = document.createElementNS('http://www.w3.org/1998/Math/MathML', 'mtable') } catch (e) {}
try { o2 = document.createTextNode("\u202D") } catch (e) {}
try { document.documentElement.appendChild(o2) } catch (e) {}
try { o1.insertBefore(document.documentElement, o1.childNodes[0]) } catch (e) {}
try { document.appendChild(o1) } catch (e) {}
try { document.append(o2, undefined) } catch (e) {}
}
document.addEventListener('DOMContentLoaded', start)
</script>
</head>
</html>