对于 'clear' 特性值不是 'none' 的浮动框，其上外边界( top margin edge )必须低于前面所有左浮动框（'clear' 特性值为 "left" 时），或者右浮动框（"clear:right"），或者左右浮动框("clear:both")的下...
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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。
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。
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margin edge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。
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