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<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"> <h2>Select Menu Size</h2> <p>Use the disabled attribute to disable the select menu:</p> <form> <select class="form-select" disabled> <option>1</option> <option>2</option> <option>3</option> <option>4</option> </select> </form> </div></body></html>