HTML是网页开发的基础语言，它用来定制各种网页的元素。比如输入框，按钮、文字、标题等等元素都是有html来定义的。
先来看一个html的框架
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <!--定义网页标签页的内容--> <title></title></head><body><!--网页的全部内容--></body></html>
就是告诉服务器这个页面是一个html代码文档。这个必须有，虽然还有别的文档格式，但是这种这种写法兼容性最好。
标签提供有关页面的元信息，例：页面编码、刷新、跳转、针对搜索引擎和更新频度的描述和关键词
页面编码（告诉浏览器是什么编码）
刷新和跳转
关键词
描述
例如：cnblogs
X-UA-Compatible
微软的IE6是通过XP、Win2003等操作系统发布出来，作为占统治地位的桌面操作系统，也使得IE占据了通知地位，许多的网站开发的时候，就按照IE6的标准去开发，而IE6自身的标准也是微软公司内部定义的。到了IE7出来的时候，采用了微软公司内部标准以及部分W3C的标准，这个时候许多网站升级到IE7的时候，就比较痛苦，很多代码必须调整后，才能够正常的运行。而到了微软的IE8这个版本，基本上把微软内部自己定义的标准抛弃了，而全面的支持W3C的标准，由于基于对标准彻底的变化了，使得原先在早期IE8版本上能够访问的网站，在IE8中无法正常的访问，会出现一些排版错乱、文字重叠，显示不全等各种兼容性错误。
与任何早期浏览器版本相比，Internet Explorer 8 对行业标准提供了更加紧密的支持。 因此，针对旧版本的浏览器设计的站点可能不会按预期显示。 为了帮助减轻任何问题，Internet Explorer 8 引入了文档兼容性的概念，从而允许您指定站点所支持的 Internet Explorer 版本。 文档兼容性在 Internet Explorer 8 中添加了新的模式；这些模式将告诉浏览器如何解释和呈现网站。 如果您的站点在 Internet Explorer 8 中无法正确显示，则可以更新该站点以支持最新的 Web 标准（首选方式），也可以强制 Internet Explorer 8 按照在旧版本的浏览器中查看站点的方式来显示内容。 通过使用 meta 元素将 X-UA-Compatible 标头添加到网页中，可以实现这一点。
当 Internet Explorer 8 遇到未包含 X-UA-Compatible 标头的网页时，它将使用 指令来确定如何显示该网页。 如果该指令丢失或未指定基于标准的文档类型，则 Internet Explorer 8 将以 IE5 模式（Quirks 模式）显示该网页。更多
Title
网页头部信息
Link
css
icon
Style
在页面中写样式
例如：
.bb{
background-color: red;
}
Script
引进文件
写js代码
...
从代码中我们可以看到一个标准的html网页文件主要由2部分组成
这个标签之间的内容就是用来定义网页的标签栏的内容的
现在我们通过浏览器打开文件看到的就是标签页的有了标题
再次刷新刚才的页面我们就看到了页面上已经有了文字
常用的标签
p和br标签
p是段落，两行字符之间是有间隔的
p和br都可以是实现字符串换行的效果，但是展示的时候还是有点细微的差别的。
刷新之后的结果如下
a标签
a标签用来定义一个跳转链接
实现的效果如下
另外标签还有一个功能就是定义锚点。也就是我们在网上阅读小说的时候，通过点击标签的链接直接调转到指定的章节。这个需要配置CSS的
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