<!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">
<p>每个 Bootstrap 标题的 font-size 取决于屏幕大小。尝试调整浏览器窗口的大小可查看效果。</p>
<h1>h1 Bootstrap 标题</h1>
<h2>h2 Bootstrap 标题</h2>
<h3>h3 Bootstrap 标题</h3>
<h4>h4 Bootstrap 标题</h4>
<h5>h5 Bootstrap 标题</h5>
<h6>h6 Bootstrap 标题</h6>
</div>
</body>
</html>