Containing block horizontal constraint. A left float box's left margin edge may not be to the left of the containing block's left padding edge.
包含块的水平限制:左浮动框的margin edge不能在包含块的左padding edge框的左边。
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。
The padding edge defines the edges of the containing block.
padding edge定义了此包含块的边缘。
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