​x
 
<html>
<head>
​
<script type="text/javascript">
txtsize=0
maxsize=100
​
function writemsg()
{
if (txtsize<maxsize)
    {
    document.getElementById('msg').style.fontSize=txtsize
    txtsize++
    timer=setTimeout("writemsg()",10)
    }
}
​
function stoptimer()
{
clearTimeout(timer)
}
</script>
</head>
<body onload="writemsg()" onunload="stoptimer()">
<p id="msg">W3School.org.cn!</p>
</body>
</html>
​