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有三样标签可以用：
1、<xmp>
2、<pre>
3、<code>不过，MDN上这样说：
Note: Do not use this element(<xmp>).
It has been deprecated since HTML3.2 and was not implemented in a consistent way. It was completely removed from the language in HTML5.
Use the <pre> element or, if semantically adequate, the <code> element instead. Note that you will need to escape the '<' character as '<' to make sure it is not interpreted as markup.
A monospaced font can also be obtained on any element, by applying an adequate CSS style using monospace as the generic-font value for the font-family property.原文：
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/xmp
所以，
<xmp>被淘汰了，但它是不转义标签，最好用的标签。目前在各个浏览器测试用了也还能支持。
下面我们看看，各种标签下如何让html标签不被解析到html页面上。代码和用法：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<xmp>
<div>xmp:你可以显示代码吗？</div>
</xmp>
<pre>
<div>
pre: 你可以显示代码么？
</div>
</pre>
<code>
<div>
code: 你可以显示代码么？
</div>
</code>
</body>
</html>效果：
还有一个pre和code的区别：
http://www.php.cn/div-tutorial-369716.html
https://www.jianshu.com/p/6abc36c28e45