offsetParent

原創 说书人！ 2020-03-01 16:03

本身定位为fixed
==> offsetParent:null（不是火狐）
==> offsetParent:body（火狐）

本身定位不为fixed
父级没有定位
==> offsetParent:body
父级有定位
==> offsetParent:定位父级

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