简单教程
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代码编辑器：
<meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/static/lib/bootstrap/4.0.0/css/bootstrap.min.css"> <script src="/static/lib/jquery/3.3.1/jquery.min.js"></script> <script src="/static/lib/popper.js/1.12.9/umd/popper.min.js"></script> <script src="/static/lib/bootstrap/4.0.0/js/bootstrap.min.js"></script> <div class="container"> <h2>排版</h2> <p class="text-lowercase">Lowercased text.</p> <p>The <abbr title="World Health Organization">WHO</abbr> was founded in 1948. (normal abbr)</p> <p>The <abbr title="World Health Organization" class="initialism">WHO</abbr> was founded in 1948. (slightly smaller abbr)</p> </div>
运行结果：