<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>突出显示文本</h1> <p>使用 mark 元素（或 .mark 类）来 <mark>突出显示</mark> 文本。</p></div></body></html>