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HTML 5与HTML 4的区别_html/css_WEB-ITnose

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Jun 21, 2016 am 08:56 AM

严重的拖延者患者，本来前天就打算写的，奈何拖到的今天才...（对拖延症有啥好的建议还望留言下，感激不尽...）

过完年了，跳槽蠢蠢欲动了，看些基础知识好应对面试，正好就整理整理...

正文开始

1.推出的理由及目标

解决web上存在的各种问题，html5的出现对web来说意义非常重大。

a.web浏览器之间的兼容性很低

制定规范的html标准，详细分析各web浏览器说具有的功能，依次为基准让各大浏览器都符合一个通用的标准。

b.文档结构不够明确

我们之前都大量的使用div元素，没办法区分开正文，功能块，引入的很多语义化元素header,footer,nav等...

c.web应用程序的功能受到限制

web的应用程序跟app差别很大，html5也提供的很多api，各浏览器厂商也在快速封装这些api，弥补功能的受限。

2.语法的改变

a.docpyte声明

HTML5简化了很多细微的语法，例如doctype的声明，你只需要写就行了。

HTML 4:

b.指定的字符编码

HTML 5 指定 UTF-8 编码的方式如下

HTML 4:

c.具有boolean值的属性

可以省略值

d.省略引号

可以引号

具体还有很多，这里就不一一列举了...

3.新增的标签、属性

新增表单的属性

新增a链接的属性

4.废除的标签、属性

废除的a链接属性

5.全局属性

具体详细的资料可自行百度...

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