pretextarea
HTML
<textarea id="source" rows="10" cols="80"></textarea>
<pre id="destination">
</pre>
JavaScript
$('#source').on('change', function() {
$('#destination').text($('#source').val());
});
<textarea id="source" rows="10" cols="80"></textarea>
<pre id="destination">
</pre>
$('#source').on('change', function() {
$('#destination').text($('#source').val());
});