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<title>Bootstrap 示例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.cn/lib/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.5.1.min.js"></script>
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</head>
<body>
<div class="container">
<h1>缩略语</h1>
<p>abbr 元素用于标记缩写词或首字母缩略词：</p>
<p><abbr title="世界卫生组织">WHO</abbr> 成立于 1948 年。</p>
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</body>
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