<title>Bootstrap5 实例</title>
<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>
<div class="container mt-3">
<div class="btn-group-vertical">
<button type="button" class="btn btn-primary">Apple</button>
<button type="button" class="btn btn-primary">Samsung</button>
<button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown">Sony</button>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="#">Tablet</a></li>
<li><a class="dropdown-item" href="#">Smartphone</a></li>
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