RESOLVED CONFIGURATION CHANGED 235171
REGRESSION (iOS 15): Touch position shifts upward from rendering position when changed `position` to `fixed` after scrolling down. 
https://bugs.webkit.org/show_bug.cgi?id=235171
Summary REGRESSION (iOS 15): Touch position shifts upward from rendering position whe...
Nozomu Miyamoto
Reported 2022-01-12 19:25:39 PST
Created attachment 449020 [details] bugged web inspector Touch position shifts 85px(about the height of the navigation bar) upward from rendering position when changed `position` to `fixed` after scrolling down.
Attachments
bugged web inspector (994.30 KB, image/png)
2022-01-12 19:25 PST, Nozomu Miyamoto 		no flags
Details
reproduction demo with iOS 14.5 (1008.59 KB, image/png)
2022-01-16 23:15 PST, Nozomu Miyamoto 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Nozomu Miyamoto
Comment 1 2022-01-12 19:26:35 PST
iOS 15 Rendering Bug Demo https://github.com/nontangent/ios-15-rendering-bug-demo
Alexey Proskuryakov
Comment 2 2022-01-14 16:33:08 PST
Thank you for the report! Could you please confirm if this is new with iOS 15, or if this was happening with iOS 14.x before?
Nozomu Miyamoto
Comment 3 2022-01-16 23:14:50 PST
OK. I just confirmed on iOS 14.5 simulator. As a result, this is a new problem with iOS 15 and it was not happened with iOS 14.5 as show in the new attached picture.
Nozomu Miyamoto
Comment 4 2022-01-16 23:15:43 PST
Created attachment 449310 [details] reproduction demo with iOS 14.5
Radar WebKit Bug Importer
Comment 5 2022-01-17 19:14:05 PST
<rdar://problem/87693262>
Simon Fraser (smfr)
Comment 6 2022-02-25 14:26:21 PST Comment hidden (obsolete)
Simon Fraser (smfr)
Comment 7 2022-02-25 14:36:25 PST
I can't reproduce this in recent builds. Are you able to try iOS 15.4 beta?
Nozomu Miyamoto
Comment 8 2022-02-28 00:37:07 PST
(In reply to Simon Fraser (smfr) from comment #7) > I can't reproduce this in recent builds. Are you able to try iOS 15.4 beta? Really!? It's good news! I can reproduce this in the simulator on iOS 15.2. Unfortunately, I can't try it on iOS 15.4-beta because I don't have the actual machine, but I will do it when it is added to the simulator.
Jon Lee
Comment 9 2022-02-28 12:46:22 PST
Marking as config changed for now, then. Please reopen if this continues to reproduce.
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