谢楼上二位了。

【 在 shaolin (叶孤城|漫漫当爹路) 的大作中提到: 】
: The following example shows an absolutely positioned box that is a child of a relatively positioned box. Although the parent outer box is not actually offset, setting its 'position' property to 'relative' means that its box may serve as the containin
: 见w3，有很详细的说明。
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