​x
 
<html>
<head>
<script type="text/javascript">
function setFont()
{
document.getElementById("p1").style.font="italic bold 12px arial,serif";
}
</script>
</head>
<body>
​
<p id="p1">This is an example paragraph.</p>
​
<input type="button" onclick="setFont()" value="Change font" />
​
</body>
</html>
​