此前的标签和属性可以是大写、小写，或者任意大小写字母的组合，而有效的XHTML 1.0文档则要求所有标签和属性必须一律小写。
Whereas previously tags and attributes could be written in uppercase, lowercase, or any combination thereof, a valid XHTML 1.0 document required all tags and attributes to be lowercase.
此前的标签和属性可以是大写、小写，或者任意大小写字母的组合，而有效的XHTML 1.0文档则要求所有标签和属性必须一律小写。
Whereas previously tags and attributes could be written in uppercase, lowercase, or any combination thereof, a valid XHTML 1.0 document required all tags and attributes to be lowercase.
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