Opposite horizontal margin constraint. A left float box that has another left float box to its left may not have its right margin edge to the right of the containing block's right padding edge.

对立水平边框限制：如果一个左浮动框的左边还有另一个左浮动框，那么这个左浮动框的右 margin edge 不能在此包含块的右 padding edge 之右。

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Left - Increase the generated box's top margin so that the top border edge is below the bottom margin edge of any left float boxes generated from previous source elements.

left -增加所生成框的上边框，以便上border edge处于由之前的源元素所生成的任一左浮动框的底margin edge之下。

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Right - Increase the generated box's top margin so that the top border edge is below the bottom margin edge of any right float boxes generated from previous source elements.

right -增加所生成框的上边框，以便上border edge处于由之前的源元素所生成的任一右浮动框的底margin edge之下。

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