The padding edge defines the edges of the containing block.
padding edge定义了此包含块的边缘。
The padding edge includes the padding applied to the element.
padding edge包括了应用到某元素的留白。
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marginedge不能高于包含块的上padding edge。
Otherwise, the containing block is formed by the padding edge of the ancestor.
否则，包含块是由祖先的内边距边缘构成。
Otherwise, the containing block is formed by the padding edge of the ancestor.
否则，包含块是由祖先的内边距边缘构成。
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