Bootstrap4 排版 <small>
在 Bootstrap 4 中 HTML <small> 元素用于创建字号更小的颜色更浅的文本:<!DOCTYPE html>
<html>
<head>
<title>Bootstrap4 实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" >
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></script>
<script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></script>
<script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></script>
</head>
<body>
<div class="container">
<h1>更小文本标题</h1>
<p>small 元素用于字号更小的颜色更浅的文本:</p>
<h1>h1 标题 <small>副标题</small></h1>
<h2>h2 标题 <small>副标题</small></h2>
<h3>h3 标题 <small>副标题</small></h3>
<h4>h4 标题 <small>副标题</small></h4>
<h5>h5 标题 <small>副标题</small></h5>
<h6>h6 标题 <small>副标题</small></h6>
</div>
</body>
</html>
尝试一下
<mark>
Bootstrap 4 定义 <mark> 为黄色背景及有一定的内边距:
<div class="container">
<h1>高亮文本</h1>
<p>使用 mark 元素来 <mark>高亮</mark> 文本。</p>
</div>
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