Its height (top padding edge) is the height of the tallest line-box.

其高度(上padding edge)取最高的那个line - box的高度。

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Line-box vertical constraint. A left float box's top margin edge may not be higher than the top padding edge of any line-box containing a box generated by an earlier element in the source document.

line - box垂直限制：左浮动框的上margin edge不能高于任何包含由源文档中前一元素生成的框的line - box的上padding edge。

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Containing block vertical constraint. A left float box's top margin edge may not be higher than the containing block's top padding edge.

包含块的垂直限制：左浮动框的上margin edge不能高于包含块的上padding edge。

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