代码示例:(标识:eg_csse_font-size)
<html>
<head>
<style type="text/css">
h1 {font-size: 300%}
h2 {font-size: 200%}
p {font-size: 100%}
</style>
</head>

<body>
<h1>This is header 1</h1>
<h2>This is header 2</h2>
<p>This is a paragraph</p>
</body>

</html>
运行结果: