health_dim,
<!DOCTYPE html>
<html>
<head>
<title>Range</title>
</head>
<body>
<div id="in" contenteditable>111111111111111111111</div>
<script>
function setCaretToPos(elem, pos) {
var range = document.createRange();
var sel = window.getSelection();
range.setStart(elem.childNodes[0], pos);
range.collapse(true);
sel.removeAllRanges();
sel.addRange(range);
}
setCaretToPos(document.getElementById("in"), 4);
</script>
</body>
</html>