trycss_font-size_percent_em 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title>
<style>
    body {font-size:100%;}
    h1 {font-size:2.5em;}
    h2 {font-size:1.875em;}
    p {font-size:0.875em;}
</style>
</head>
<body>
    
    <h1>这是标题1</h1>
    <h2>这是标题2</h2>
    <p>这是一个段落。</p>
    <p>以百分比和em指定字体大小将显示相同的大小
    主要浏览器，并允许所有浏览器调整文本大小！</p>
</body>
</html>
 
 
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运行结果
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