<html>
<body>
<textarea id="mytext" cols = 50 rows = 50></textarea>
<script>
var str = 'I\'m a JavaScript programmer';
var counter = 0;
var timerId = setInterval(function() {
if (counter < str.length)
{
document.getElementById("mytext").innerHTML += str.charAt(counter);
counter = counter + 1;
}
else
{
clearInterval(timerId);
}
}, 200);
</script>
<body>
</html>
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