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<!DOCTYPE html> <html> <head> <title>Bootstrap5 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h2>表单浮动标签 - select</h2> <p>我们可以在选择菜单上使用浮动标签，它将始终显示在选择菜单的左上角，不会有点击浮动效果：</p> <form action="/action_page.php"> <div class="form-floating mb-3 mt-3"> <select class="form-select" id="sel1" name="sellist"> <option>1</option> <option>2</option> <option>3</option> <option>4</option> </select> <label for="sel1" class="form-label">Select list (select one):</label> </div> <button type="submit" class="btn btn-primary">Submit</button> </form> </div> </body> </html>
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