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<!DOCTYPE html>
<html>
<body onload="onLoad()">
<textarea></textarea>
<div id="start"></div>
<div id="end"></div>
<script>
function onLoad() {
var t = document.querySelector("textarea");
t.value = "Xaa\nbbb";
t.value = "aaa\nbbb\n";
t.value += "X";
document.getElementById("start").textContent = t.selectionStart;
document.getElementById("end").textContent = t.selectionEnd;
}
</script>
</body>
</html>