The prepend-v styles, where v is 1 through 23, prepend v columns and v-1 gutters worth of pixels, using padding-left.

prepend-v样式，其中v的范围是从1到23，用于使用padding-left 为 v列和 v-1 分隔线预留足够的像素。

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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marginedge不能高于包含块的上padding edge。

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Returns a new string that left-aligns the characters in this string by padding them with Spaces on the right, for a specified total length.

传回新字串，此字串会以空格填补右侧至指定的总长度，靠左对齐这个字串中的字元。

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Returns a new string that left-aligns the characters in this string by padding them with Spaces on the right, for a specified total length.

传回新字串，此字串会以空格填补右侧至指定的总长度，靠左对齐这个字串中的字元。

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