<html>
<head>
<script src="jquery-latest.min.js"></script>
<script type="text/javascript">
$(document).ready(function()
{
$("#btn1").click(function(){
$("#divanimate").animate({fontSize:"25px"});
});
$("#btn2").click(function(){
$("#divanimate").animate({fontSize:"12px"});
});
});
</script>
</head>
<body>
<button id="btn1">Animate Start</button>
<button id="btn2">Animate Stop</button>
<div id="divanimate" style="background: pink;font:12px 'Comic Sans MS'">Animate Start to Font Size and Family will be change</div>
</body>
</html>