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1. 忽略<body>标签是合法的,HTML解析器可以自动推导缺失的标签
参考:https://www.w3.org/TR/2008/REC-CSS1-20080411/
This will work even if the author has omitted the ‘BODY‘ tag (which is legal) since the HTML parser will infer the missing tag.
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原文地址:http://www.cnblogs.com/pixcai/p/5130079.html