1986767 - Card contents are not displayed as full width in Fx View

Status: VERIFIED FIXED

(Firefox :: Firefox View, defect)

Description

[Kelly Cochrane [:kcochrane]]

Attachment: Screenshot 2025-09-03 at 3.58.20 PM.png

The contents of collapsible cards in Firefox View are no longer displaying full width after changes in bug 1941406. Per :emilio, the fix is likely just to add ::details-content { display: contents }.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1941406

:dholbert, since you are the author of the regressor, bug 1941406, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 2

[Daniel Holbert [:dholbert]]

The suggested fix in comment 0 sounds correct to me, FWIW. (It's the right way to explicitly get the behavior that we had before we implemented this spec-change, basically.)

:kcochrane are you planning on taking this (or do you know of someone else who's got this)?

Comment 3

[Kelly Cochrane [:kcochrane]]

:emilio will submit a patch for this today

Comment 4

[Emilio Cobos Álvarez [:emilio]]

Attachment: Bug 1986767 - Fix visual regression in firefox view cards. r=kcochrane

While at it nest the prefers-contrast rule (and forced-colors implies
prefers-contrast, so simplify it).

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/8e413c00d2f4
https://hg.mozilla.org/integration/autoland/rev/2eb6e94eada2
Fix visual regression in firefox view cards. r=kcochrane,desktop-theme-reviewers,fxview-reviewers

Comment 6

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/2eb6e94eada2

Comment 7

[Ryan VanderMeulen [:RyanVM]]

Please nominate this for Beta uplift.

Comment 8

[Emilio Cobos Álvarez [:emilio]]

Comment on attachment 9511452 [details]
Bug 1986767 - Fix visual regression in firefox view cards. r=kcochrane

Beta/Release Uplift Approval Request

• User impact if declined/Reason for urgency: comment 0
• Is this code covered by automated tests?: Yes
• Has the fix been verified in Nightly?: Yes
• Needs manual test from QE?: Yes
• If yes, steps to reproduce: comment 0
• List of other uplifts needed: none
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Restores previous behavior.
• String changes made/needed: none
• Is Android affected?: No

Comment 9

[Ryan VanderMeulen [:RyanVM]]

Comment on attachment 9511452 [details]
Bug 1986767 - Fix visual regression in firefox view cards. r=kcochrane

Approved for 143.0rc1.

Comment 10

[Pulsebot]

https://github.com/mozilla-firefox/firefox/commit/942e2a2dcee3
https://hg.mozilla.org/releases/mozilla-beta/rev/354c0fd61eef

Comment 11

[Alexandru Trif, Desktop Test Engineering [:atrif]]

Reproduced the issue with Firefox 143.0b9 on Windows 10x64 by following the steps from comment 0. The content inside Firefox view cards is not expanding to the card width.
The issue si verified fixed with 143.0b10 (20250906223326) from comment 10 and 144.0a1 (2025-09-08) on Windows 10x64, macOS 15 and Ubuntu 24. The content inside Firefox view cards is now using all width.