Bug 235171

Summary:

REGRESSION (iOS 15): Touch position shifts upward from rendering position when changed `position` to `fixed` after scrolling down.

Product:

WebKit

Reporter:

Nozomu Miyamoto <irregular0number>

Component:

Layout and Rendering

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED CONFIGURATION CHANGED

Severity:

Normal

CC:

ap, bfulgham, jonlee, simon.fraser, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

Safari 15

Hardware:

iPhone / iPad

OS:

iOS 15

Attachments:

Description	Flags
bugged web inspector	none
reproduction demo with iOS 14.5	none

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)

The "change body position fixed" button is not visible in the demo.

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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