App下载
实例代码( Tip: 登录后体验更佳 )
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool(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>1</h1>
<h2>2</h2>
<p></p>
<p>em
</p>
</body>
</html>
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运行结果