JSFiddle - React, Tailwind, and code Playground

by Talsja

HTML

<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/ui-lightness/jquery-ui.css">
<div>
<div id='jumper' data-cookie="prefs">jumper</div>
</div>

CSS

#jumper {
    width:400px;
    background: orange;
		padding:50px;
}

[data-cookie="prefs"] {
    height: 0px;
}

JavaScript

$("#jumper").css({height:'auto'});
var height =$("#jumper").height();

$("#jumper").animate({ 
    height: height
}, 2000, 'easeInBack' );