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Test Info:

<html>
<head>
<script>
function boom()
{
var br = document.getElementById("br");
br.contentEditable = "true";
br.focus();
try { document.execCommand("justifyfull", false, null); } catch(e) { }
try { document.execCommand("justifyfull", false, null); } catch(e) { }
document.execCommand("underline", false, null);
document.execCommand("insertimage", false, "foo");
try { document.execCommand("outdent", false, null); } catch(e) { }
}
</script>
</head>
<body onload="boom();"><br id="br"></body>
</html>