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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml" style="display: table">
<head>
<script type="text/javascript">
function boom()
{
var tr = document.getElementById("tr");
tr.contentEditable = "true";
tr.focus();
document.execCommand("selectAll", false, null);
}
</script>
</head>
<body onload="boom();"><tr id="tr"><td></td></tr></body>
</html>