Fixed positioning is a subcategory of absolute positioning. The only difference is that for a fixed positioned box, the containing block is established by the viewport.

固定定位是绝对定位的一种特殊情况，即他的包含框永远都是视口。

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Fixed positioning is a subcategory of absolute positioning. The only difference is that for a fixed positioned box, the containing block is established by the viewport.

固定定位是绝对定位的一种特殊情况，即他的包含框永远都是视口。

youdao