之前元素的垂直限制：左浮动框的上marginedge不能高于任何块或在由源文档中前一元素生成的被浮动框的上margin edge。

Previous element vertical constraint. A left float box's top margin edge may not be higher than the top margin edge of any block or floated box generated by an earlier element in the source document.

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之前元素的垂直限制：左浮动框的上marginedge不能高于任何块或在由源文档中前一元素生成的被浮动框的上margin edge。

Previous element vertical constraint. A left float box's top margin edge may not be higher than the top margin edge of any block or floated box generated by an earlier element in the source document.

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