HTML closing tag problem_html/css_WEB-ITnose
根据w3c的原则，xml的每个开始标签必须有一个结束标签与之对应，也就是<html>必须要有</html>结束，才是一个完整的元素，除非它是一个自封闭标签，自封闭就是<img src="... " />之类的标签。html是xml的子级，所以也要遵循xml的原则，这是标准。所以，<meta charset=UTF-8> 不加/> 来结束，不符合标准，只适合html 4.0以前的版本，目前大多网站为了seo和多浏览器支持，都采用xhtml标准写法。
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