Firefox 115esr doesn't support thumbnail sizes or upright parameter
Closed, ResolvedPublicBUG REPORT
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Description

This came up in feedback from at least two users. Firefox 115esr was only recently released but does not support CSS round
https://caniuse.com/wf-round-mod-rem

Given the round is not vital, we should fallback to the rule without round.

Steps to replicate the issue (include links if applicable):

Visit Windows 7 and Firefox 115esr
Compare https://en.wikipedia.org/wiki/User:Jdlrobson/T375981 with and without parsoid

What happens?:
Thumbnails using upright do not render the same across parsers

What should have happened instead?:
They should render the same.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

Details

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	Provide support for upright in thumbnails for older browsers	mediawiki/core	wmf/1.46.0-wmf.26	+12 -5
	Provide support for upright in thumbnails for older browsers	mediawiki/core	master	+12 -5

Customize query in gerrit

Event Timeline

Jdlrobson-WMF created this task.Apr 27 2026, 11:31 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptApr 27 2026, 11:31 PM

Change #1277618 had a related patch set uploaded (by Jdlrobson; author: Jdlrobson):

[mediawiki/core@master] Provide support for upright in thumbnails for older browsers

https://gerrit.wikimedia.org/r/1277618

gerritbot added a project: Patch-For-Review.Apr 27 2026, 11:32 PM

Change #1277618 merged by jenkins-bot:

[mediawiki/core@master] Provide support for upright in thumbnails for older browsers

https://gerrit.wikimedia.org/r/1277618

Maintenance_bot removed a project: Patch-For-Review.Apr 28 2026, 1:31 AM

ReleaseTaggerBot added a project: MW-1.47-notes (1.47.0-wmf.1; 2026-05-05).Apr 28 2026, 2:00 AM

Change #1278513 had a related patch set uploaded (by Jdlrobson; author: Jdlrobson):

[mediawiki/core@wmf/1.46.0-wmf.26] Provide support for upright in thumbnails for older browsers

https://gerrit.wikimedia.org/r/1278513

gerritbot added a project: Patch-For-Review.Apr 28 2026, 4:41 PM

Change #1278513 merged by jenkins-bot:

[mediawiki/core@wmf/1.46.0-wmf.26] Provide support for upright in thumbnails for older browsers

https://gerrit.wikimedia.org/r/1278513

Mentioned in SAL (#wikimedia-operations) [2026-04-28T21:40:49Z] <jdlrobson@deploy1003> Started scap sync-world: Backport for [[gerrit:1278513|Provide support for upright in thumbnails for older browsers (T424596)]]

Mentioned in SAL (#wikimedia-operations) [2026-04-28T21:42:39Z] <jdlrobson@deploy1003> jdlrobson: Backport for [[gerrit:1278513|Provide support for upright in thumbnails for older browsers (T424596)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

Mentioned in SAL (#wikimedia-operations) [2026-04-28T21:51:32Z] <jdlrobson@deploy1003> Finished scap sync-world: Backport for [[gerrit:1278513|Provide support for upright in thumbnails for older browsers (T424596)]] (duration: 10m 43s)

ReleaseTaggerBot added a project: MW-1.46-notes (1.46.0-wmf.26; 2026-04-28).Apr 28 2026, 10:00 PM