在HTML中 root和body？
：root{background:#..}和body{background:#...}的区别
回复内容：
root 指的是文档的根元素，对于 html 文档来说，就是 元素。但是 :root { background: ... } 与 body { background: ... } 通常没有区别，这是因为 CSS 规范规定（https://drafts.csswg.org/css2/colors.html#background）在没有单独设置 html 元素上的 background 时，直接应用 body 上的 background 属性的计算值。 http://www.zhihu.com/question/20312140
详答看这个 实际上这不能算是html中的……是css样式表标准中规定了root的含义是整个文档，相对于html的标签
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