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.
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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