Bug 243813

Summary:

[iOS] Scroll position gets reset when back/forward to a page where no viewport is set.

Product:

WebKit

Reporter:

Kyouhei Horizumi <kyouhei.horizumi>

Component:

New Bugs

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

achristensen, cdumez, simon.fraser, webkit-bug-importer, wenson_hsieh

Priority:

Keywords:

InRadar

Version:

Safari 15

Hardware:

iPhone / iPad

OS:

iOS 15

Attachments:

Description	Flags
Steps to reproduce	none

Kyouhei Horizumi

Reported 2022-08-10 23:24:25 PDT

Created attachment 461540 [details] Steps to reproduce Case 1: Scroll position gets reset when back/forward to a page where no viewport is set. https://webkit-reset-scrolly-when-history-back.pages.dev/ Case 2: If viewport.width is specified, it will not be reset. e.g. `<meta name="viewport" content="width=device-width">` https://webkit-reset-scrolly-when-history-back.pages.dev/set-viewport-device-width/ Case 3: However, if any elements extend beyond the <body>, they will be reset. e.g. `div {inline-size: calc(100% + 1px);}` https://webkit-reset-scrolly-when-history-back.pages.dev/set-viewport-device-width/over-body-area/ Case 4: Even in that case, if initial-scale is set, it will not be reset. e.g. `<meta name="viewport" content="width=device-width, initial-scale=1.0">` https://webkit-reset-scrolly-when-history-back.pages.dev/set-viewport-device-width/over-body-area/set-initial-scale In all cases, pinch-in in preserves the scroll position. ---------------------- Steps to reproduce: Please see attachment (README.jpg). Expected: Restore scroll position all cases. Additional info: - iOS 15.6 / iPhone SE (2nd Generation) - Mobile Safari

Attachments
Steps to reproduce (194.61 KB, image/jpeg) 2022-08-10 23:24 PDT, Kyouhei Horizumi	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Simon Fraser (smfr)

Comment 1 2022-08-11 20:43:07 PDT

Radar WebKit Bug Importer

Comment 2 2022-08-17 23:25:18 PDT

Kyouhei Horizumi

Comment 3 2023-01-10 07:16:59 PST

Confirmed fixed in iOS 16.1.1 (20B101).

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