p#example{
color:red;
font:12px 'Arial',sans-serif;
color:red;
font:12px 'Arial',sans-serif;
}
<!DOCTYPE html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>Example</title>
<link rel="stylesheet" href="styles/styles.css" type="text/css" media="screen"/>
<script type="text/javascript">
window.onload=function(){
var para=document.getElementById("example");
alert("The font size is "+para.style.fontSize);
para.style.color="black";
para.style.font="2em 'Times',serif"
}
</script>
<body>
<p id="example">An example of a paragraph</p>
</body>
</head>
</html>