I've got an XHTML 1.0 Transitional document. Most of the content is in English, hence this is what I've got at the top:I've got an XHTML 1.0 Transitional document. Mo
阅读背景：
在指定XHTML元素的语言时，是否需要`xml：lang`属性（除了HTML`lang`属性外）？
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