严谨纯净的HTML代码:
1、元素
1)必须正确嵌套
2)必须始终关闭
,
3)必须小写
4)必须有一个根元素
2、属性
1)必须使用小写
2)必须用引号包围width="10",height='5'
3)禁止最小化disabled="disabled",readonly="readonly"
3、特殊字符使用字符实体,如,&
w3c提供了html、xhtml的验证服务http://validator.w3.org/,可通过URL、上传文件和粘贴源代码三种方式验证。
一起看看几个URL的验证结果:
1、网易http://www.163.com/
702 Errors, 11 warning(s)大部分是&字符问题和扩展属性问题,三大门户只有网易使用的是html5。
2、新浪http://www.sina.com.cn/
Sorry! This document cannot be checked.
3、搜狐http://www.sohu.com/
1940 Errors, 299 warning(s)
4、百度http://www.baidu.com/
45 Errors, 14 warning(s)
5、谷歌http://www.google.com/
30 Errors, 5 warning(s)

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