HTML 5与HTML 4的区别_html/css_WEB-ITnose
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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