菜鸟教程在线编辑器

AI 编程工具
 
                <!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h1>更小文本标题</h1>
  <p>small 元素用于字号更小的颜色更浅的文本:</p>       
  <h1>h1 标题 <small>副标题</small></h1>
  <h2>h2 标题 <small>副标题</small></h2>
  <h3>h3 标题 <small>副标题</small></h3>
  <h4>h4 标题 <small>副标题</small></h4>
  <h5>h5 标题 <small>副标题</small></h5>
  <h6>h6 标题 <small>副标题</small></h6>
</div>

</body>
</html>
              