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关于HTML标签那些事儿_html/css_WEB-ITnose

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Jun 24, 2016 am 11:23 AM

　　关于html相信对于每一个互联网从业者来说实在熟悉不过的一个名词，特别是web前端工程师来说更是基础中的基础。html是hyper text markup language的首字母缩写，翻译过来就是超文本标记语言。即采用标签的方式来标记页面中的元素。这些标签可以嵌套，有特殊的属性和默认样式。这段时间刚好有时间系统的回顾和梳理一下html中的标签。

　　　　用于编写html文档中的注释，相当于我们一些其他语言中的//或者/**/的作用

　　　　　　用于声明文档那个类型，声明必须是 HTML 文档的第一行，位于标签之前。声明不是 HTML 标签；它是指示 web 浏览器关于页面使用哪个 HTML 版本进行编写的指令。

常用的DOCTYPE声明如下：

html5:;

HTML 4.01 Strict该 DTD(Document Type Definition文档定义类型) 包含所有 HTML 元素和属性，但不包括展示性的和弃用的元素（比如 font）。不允许框架集（Framesets）。

HTML 4.01 Transitional 该 DTD 包含所有 HTML 元素和属性，包括展示性的和弃用的元素（比如 font）。不允许框架集（Framesets）

nbsp;"http://www.w3.org/TR/html4/loose.dtd">

HTML 4.01 Frameset该 DTD 等同于 HTML 4.01 Transitional，但允许框架集内容。

nbsp;"http://www.w3.org/TR/html4/frameset.dtd">

XHTML 1.0 Strict该 DTD 包含所有 HTML 元素和属性，但不包括展示性的和弃用的元素（比如 font）。不允许框架集（Framesets）。必须以格式正确的 XML 来编写标记。

nbsp;"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

XHTML 1.0 Transitional该 DTD 包含所有 HTML 元素和属性，包括展示性的和弃用的元素（比如 font）。不允许框架集（Framesets）。必须以格式正确的 XML 来编写标记。

XHTML 1.0 Frameset该 DTD 等同于 XHTML 1.0 Transitional，但允许框架集内容。

nbsp;"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">

XHTML 1.1该 DTD 等同于 XHTML 1.0 Strict，但允许添加模型（例如提供对东亚语系的 ruby 支持）。

　　　　用于定义超链接，用于从一张页面链接到另一张页面。

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