BFC

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先看一下英文解释：Floats, absolutely positioned elements, block containers (such as inline-blocks, table-cells, and table-captions) that are not block boxes, and block boxes with ‘overflow‘ other than ‘visible‘ (except when that value has been propagated to the viewport) establish new block formatting contexts for their contents.

浮动元素和绝对定位元素，非块级盒子的块级容器（例如 inline-blocks, table-cells, 和 table-captions），以及overflow值不为“visiable”的块级盒子，都会为他们的内容创建新的BFC（块级格式化上下文）。

BFC 盒内布局不受外界影响是一块非常自由的区域。

BFC

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原文地址：http://www.cnblogs.com/Mrxiedh/p/4794069.html