On the iPhone, the positioning Fixed will disappear when you swipe the page, and it will appear again when it does not move. What is the solution?

as the title

on the iPhone, the positioning Fixed will disappear when you swipe the page, and it will appear again when it does not move. How to solve this problem?

I refer to the solution of ide doesn"t disappear, but I can"t detect a change in the scroll bar

Javascript mobile-browser
Mar.02,2021

add a scroll bar in the middle of the block-- 


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