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<!DOCTYPE html> <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"> <h2>浮动标签 - 选择菜单</h2> <p>您还可以在选择菜单上使用“浮动标签”。但是，它们不会浮动/获得动画。标签将始终出现在左上角的选择菜单内：</p> <form action="/demo/html/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">选择列表（选择一项）：</label> </div> <button type="submit" class="btn btn-primary">提交</button> </form> </div> </body> </html>