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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
<style>
h1 {letter-spacing:2px;}
h2 {letter-spacing:-3px;}
</style>
</head>
<body>
<h1>这是标题 1</h1>
<h2>这是标题 2</h2>
</body>
</html>