Knowledge is my strength

Jquery

$(document).ready(function(){
$('textarea.expand').focus(function () {
    $(this).animate({ height: "400px" }, 500);
    $('html, body').animate({scrollTop: '140px'}, 800);
});
});

<textarea class="expand" rows="1" cols="10" readonly="readonly"></textarea>

<style>
.expand{height:100px;padding:5px;}
</style>