插入代码片段
<p>This text contains <sub>xiabiao</sub> text.</p>

<p>This text contains <sup>shangbiao</sup> text.</p>

<p>My favorite color is  <ins>red</ins>!</p>

<p>My favorite color is <del>blue</del> </p>

<p>
  To learn AJAX, you must be familiar with the XML<wbr />Http<wbr />Request
  Object.
</p>

<pre>
web
</pre>
copy

This text contains xiabiao text.

This text contains shangbiao text.

My favorite color is red!

My favorite color is blue

To learn AJAX, you must be familiar with the XMLHttpRequest Object.

web

The <abbr title="World Health Organization">WHO</abbr> was founded in 1999.

<address>
  Written by <a href="mailto:webmaster@qq.com">Jon Doe</a>.<br />
  Visit us at:<br />
  Example.com<br />
  Box 564, Disneyland<br />
  USA
</address>

<bdo dir="rtl">
  This text will go right-to-left.
</bdo>

<blockquote cite="http://www.worldwildlife.org/who/index.html">
  For 50 years, WWF has been protecting the future of nature. The world's
  leading conservation organization, WWF works in 100 countries and is supported
  by 1.2 million members in the United States and close to 5 million globally.
</blockquote>

<p>
  WWF's goal is to:
  <q>Build a future where people live in harmony with nature.</q>
  We hope they succeed.
</p>
copy

<ol>
  <li>A</li>
  <li>B</li>
  <li>C</li>
</ol>

<ol start="115">
  <li>Coffee</li>
  <li>Tea</li>
  <li>Milk</li>
</ol>
copy

<dl>
  <dt>SHUXUE</dt>
  <dd>XUEKE</dd>
  <dt>YINGYU</dt>
  <dd>是一门外语言</dd>
</dl>
copy

XUEKE
YINGYU
是一门外语言
copy

<ul>
  <li>YINGYU</li>
  <li>YUWEN</li>
  <li>SHUXUE</li>
</ul>```
copy

YINGYU YUWEN SHUXUE ```