<!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>