tryw3_css_dow_4 在线代码实例

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<!DOCTYPE html>
<html>
<title>编程狮(w3cschool.cn)</title>
<link type="text/css" rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
<body>
    <div class="w3-container">
      <h1>这是标题1</h1>
      <h2>这是标题2</h2>
      <h3>这是标题3</h3>
      <h4>这是标题4</h4>
      <h5>这是标题5</h5>
      <h6>这是标题6</h6>
      <p>这是一个段落.</p>
    </div>
</body>
</html>
 
 
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运行结果
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