Valid html and css is one step , using html semanticly is another . there ' s far more to accessibility than i could possibly fit in one post ( or even one book ) 验证只是第一步，还要合理使用html标签，甭说这个回复，就算一本书也不一定能说完。
Since xhtml is case sensitive , and since xhtml only accepts lower case html tags and attribute names , a general search and replace function was executed to replace all upper case tags with lowercase tags 自从xhtml区分大小写并只接受小写html标签和属性后，查找所有大写标签并替换成小写标签的工作开始了。
Most significantly , they all let the developer mix code in the middle of html tags : with jsp , the code is written in the java language ; with php , the code is an ad - hoc scripting language ; and with xslt , the code is xml tags in the xslt namespace 最明显的，它们都允许开发人员在html标签中混合编码： jsp使用java编写代码， php使用特别的脚本语言，而对于xslt代码则是xslt名称空间的xml标签。
