Bug 292380

Summary:

AX: content-visibility change from hidden to visible ignored by VoiceOver

Product:

WebKit

Reporter:

Nathan Knowler <nathan>

Component:

Accessibility

Assignee:

Tyler Wilcock <tyler_w>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

andresg_22, nathan, tyler_w, webkit-bug-importer

Priority:

Keywords:

HasReduction, InRadar

Version:

Safari Technology Preview

Hardware:

All

OS:

All

Attachments:

Description	Flags
Reduction: checkboxes controlling adjacent content’s `content-visibility` property	none
iOS VoiceOver interacting with the reduction demonstrating the issue.	none

Nathan Knowler

Reported 2025-05-01 09:47:05 PDT

Created attachment 475105 [details] Reduction: checkboxes controlling adjacent content’s `content-visibility` property When CSS content-visibility changes from hidden to visible the content is still ignored by VoiceOver. It does seem like further interaction with adjacent elements can eventually make the content available for VoiceOver. It doesn’t seem to be a timing issue (i.e. waiting for any length of time does not make a difference — the content is still ignored). macOS 15.4.1 (24E263) iOS 18.4.1 (22E252) Safari versions tested (on macOS): - Version 18.4 (20621.1.15.11.10) - Release 217 (Safari 18.4, WebKit 20622.1.9.19.2)

Attachments
Reduction: checkboxes controlling adjacent content’s `content-visibility` property (1.06 KB, text/html) 2025-05-01 09:47 PDT, Nathan Knowler	no flags	Details
iOS VoiceOver interacting with the reduction demonstrating the issue. (5.83 MB, video/mp4) 2025-05-01 10:01 PDT, Nathan Knowler	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Radar WebKit Bug Importer

Comment 1 2025-05-01 09:47:24 PDT

<rdar://problem/150453039>

Nathan Knowler

Comment 2 2025-05-01 10:01:14 PDT

Created attachment 475106 [details] iOS VoiceOver interacting with the reduction demonstrating the issue. Here’s a screen recording of using iOS VoiceOver to interact with the reduction. You can see both the described issue of the content being ignored AND how interactions with adjacent, unrelated elements sometimes cause the content to be available for VoiceOver.

Nathan Knowler

Comment 3 2025-05-01 10:16:58 PDT

When inspecting the element’s accessibility properties in Web Inspector, I’m noticing that it remains ignored with the reason of it being hidden. If I select another node in Element panel and then switch back to the original element, this value updates and when I focus the page with VoiceOver again, the content is available. It seems like the accessibility tree isn’t being updated.

Tyler Wilcock

Comment 4 2025-05-01 11:07:06 PDT

Hey again Nathan! Thanks for reporting this one — I believe it's fixed on `main`. If possible, could you try a nightly build and confirm? https://webkit.org/build-archives

Nathan Knowler

Comment 5 2025-05-01 11:26:16 PDT

I’m still experiencing this issue in the latest build of main 294377.

Tyler Wilcock

Comment 6 2025-05-01 12:28:42 PDT

Ahh whoops, I can too — had something misconfigured on my end. Will investigate.

Tyler Wilcock

Comment 7 2025-05-01 16:53:40 PDT

Pull request: https://github.com/WebKit/WebKit/pull/44812

EWS

Comment 8 2025-05-02 02:03:54 PDT

Committed 294420@main (ff17b1c5fada): <https://commits.webkit.org/294420@main> Reviewed commits have been landed. Closing PR #44812 and removing active labels.

Nathan Knowler

Comment 9 2025-05-02 06:54:17 PDT

I can confirm this works for me in the latest build of main as of writing this (294427). Thank you for the quick turnaround!

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