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Test Info:

<!DOCTYPE html>↩
<html>↩
<head>↩
<script type="text/javascript">↩
function boom()↩
{↩
var i = document.getElementById("i");↩
i.contentDocument.designMode = "on";↩
i.previousSibling.data += "x\n";↩
i.style.counterReset = "c";↩
}↩
</script>↩
</head>↩
<body onload="boom();">&#x202E;<iframe id="i" src="data:text/html,a"></body>↩
</html>↩