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。
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borderedge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。
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borderedge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。
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borderedge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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