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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h1>较小的辅助文本</h1> <p>small 元素（和 .small 类）用于在任何标题中创建较小的辅助文本：</p> <h1>h1 heading <small>secondary text</small></h1> <h2>h2 heading <small>secondary text</small></h2> <h3>h3 heading <small>secondary text</small></h3> <h4>h4 heading <small>secondary text</small></h4> <h5>h5 heading <small>secondary text</small></h5> <h6>h6 heading <small>secondary text</small></h6> </div> </body> </html>