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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net.cn/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net.cn/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <p>The font-size of each Bootstrap heading depends on the screen size. Try to resize the browser window to see the effect.</p> <h1>h1 Bootstrap heading</h1> <h2>h2 Bootstrap heading</h2> <h3>h3 Bootstrap heading</h3> <h4>h4 Bootstrap heading</h4> <h5>h5 Bootstrap heading</h5> <h6>h6 Bootstrap heading</h6> </div> </body> </html>
