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div 包含 div问题_html/css_WEB-ITnose

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Release： 2016-06-21 09:01:54
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为何2 设置margin-top之后1 页跟着往下20px？；不是应该2相对于1往下20px么？


回复讨论(解决方案)





如果这样子，3会相对于2往下20px；

这是CSS 外边距合并特性

http://www.w3school.com.cn/css/css_margin_collapsing.asp

每个元素都有其默认的外边距，1是由默认的外边距，你设置2的外边距为20px，两个外边距会进行合并取较大值。

内边聚试下呢？不知道行不

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