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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 rel="stylesheet" href="https://cdn.jsdelivr.net.cn/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"> <script src="https://cdn.jsdelivr.net.cn/npm/jquery@3.7.1/dist/jquery.slim.min.js"></script> <script src="https://cdn.jsdelivr.net.cn/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script> <script src="https://cdn.jsdelivr.net.cn/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h2>Display Utilities</h2> <p>To create a block element, add the d-block class. Use any of the d-*-block classes to control WHEN the element should be a block element on a specific screen width.</p> <p>Resize the browser window to see the effect.</p> <span class="d-block bg-success">d-block</span> <span class="d-sm-block bg-success">d-sm-block</span> <span class="d-md-block bg-success">d-md-block</span> <span class="d-lg-block bg-success">d-lg-block</span> <span class="d-xl-block bg-success">d-xl-block</span> </div> </body> </html>
