(cherry picked from commit 4b26c255)

(cherry picked from commit cec0f742)

(cherry picked from commit 5709ddc6)

(cherry picked from commit bb29d44d)

(cherry picked from commit a249bf34)

(cherry picked from commit 76a21aec)

(cherry picked from commit 52bac8b7)

(cherry picked from commit b72209a4)

如果父元素设置了`overflow-y: auto; -webkit-overflow-scrolling: touch;`样式，那么他的自元素即使是fixed也会受overflow属性影响而无法显示

如果父元素设置了`overflow-y: auto; -webkit-overflow-scrolling: touch;`样式，那么他的自元素即使是fixed也会受overflow属性影响而无法显示

This reverts commit 4f4c8ea4, reversing
changes made to f278f7ac.