HTML 标签：sub

请等一下！这难道不是一种**印刷约定**，而且**定义上是表现层面的**吗？表现层难道不是 CSS 的领域吗？是的，确实是！

sub 和 sup 是 HTML5 规范中所有标签里最令人憎恶的篡入者。快跑。它们应该是下一部《复仇者联盟》电影里的坏蛋。

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示例

<p>A blind <u>loin</u> (<i>Panthera leo</i>) asked what the 2 in E=MC<sup>2</sup> and H<sub>2</sub>O meant.</p>
<p>She went on to ask if it was supposed to be <b>emphasized</b> in some way.</p>
<p>She reached the conclusion that this HTML is, in fact, <s>presentational, rather than</s> meaningful.</p>
<p>Disclaimer: <small>Most of this page, on most levels, it mostly nonsense.</small></p>