一、啥是文档类型？
在网站开发中一定遇到过这样几种html文档
是啥？
Web 世界中存在许多不同的文档。只有了解文档的类型，浏览器才能正确地显示文档。
HTML 也有多个不同的版本，只有完全明白页面中使用的确切 HTML 版本，浏览器才能完全正确地显示出 HTML 页面。这就是 的用处。
不是 HTML 标签。它为浏览器提供一项信息（声明），即 HTML 是用什么版本编写的。
这三种html具有不同的文档类型，分别是： html 4.0 xhtml 1.0 html5。
html在他的发展过程中遇到过以下几个版本，目前沿用的就是这三个。
二、xhtml 和 html4.0
html5相信没什么好说的，最近太火了，应该都多多少少有些概念。
XHTML是符合XML标准的Web一种开发语言。它是参考HTML语法，在HTML4.0基础上，修改而来的。可以称其为XHTML1.0。
XML标准 是啥？
1.XML文档有且只有一个根标签，这里就是
2.XML文档内没一个开始标签都必须对应一个结束标签，也可以出现这种标签，叫做空元素
3.XML的标签内的属性严格区分大小写，也就是
4.XML标签的属性值必须用" "包含起来
5.XML文档的所有标签必须正确闭合。
除此之外，同html4.0相比，添加了几个特定的标签。
address 标记地址
dl 定义列表
dt 定义列表定义
dd 定义列表的定义解释
blockquote 块
q行内引用
label标注表单元素
th 表格表头
thead 表格的页眉
tfoot 表格的页脚
fieldset 分组表单元素
button 按钮
cite指定其他源的引用或参考书目
samp表示脚本、程序等样本输出
kbd表示等待用户进入的文本
abbr指定缩写的表单、字或短语
acronym表示首字母缩写
PS：如果你用的是 Sublime Text 并且安装了emmet插件的话。
html:4s + tab键 自动生成 html 4.0文档
html:xs + tab键 自动生成 xhtml 1.0文档
! + tab键 自动生成 html 5 文档
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