Bug 235171 - REGRESSION (iOS 15): Touch position shifts upward from rendering position when changed `position` to `fixed` after scrolling down.
Summary: REGRESSION (iOS 15): Touch position shifts upward from rendering position whe...
Status: RESOLVED CONFIGURATION CHANGED
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: Safari 15
Hardware: iPhone / iPad iOS 15
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2022-01-12 19:25 PST by Nozomu Miyamoto
Modified: 2022-02-28 12:46 PST (History)
6 users (show)

See Also:

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 an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Nozomu Miyamoto 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.
Comment 1 Nozomu Miyamoto 2022-01-12 19:26:35 PST 
iOS 15 Rendering Bug Demo
https://github.com/nontangent/ios-15-rendering-bug-demo
Comment 2 Alexey Proskuryakov 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?
Comment 3 Nozomu Miyamoto 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.
Comment 4 Nozomu Miyamoto 2022-01-16 23:15:43 PST 
Created attachment 449310 [details]
reproduction demo with iOS 14.5
Comment 5 Radar WebKit Bug Importer 2022-01-17 19:14:05 PST 
<rdar://problem/87693262>
Comment 6 Simon Fraser (smfr) 2022-02-25 14:26:21 PST Comment hidden (obsolete)
Comment 7 Simon Fraser (smfr) 2022-02-25 14:36:25 PST 
I can't reproduce this in recent builds. Are you able to try iOS 15.4 beta?
Comment 8 Nozomu Miyamoto 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.
Comment 9 Jon Lee 2022-02-28 12:46:22 PST 
Marking as config changed for now, then. Please reopen if this continues to reproduce.