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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var r = document.createRange();
r.setEnd(document.createTextNode("x"), 0);
window.getSelection().addRange(r);
document.execCommand("inserthtml", false, "y");
}
</script>
</head>
<body contenteditable="true" onload="boom();"></body>
</html>