[MEX] Display errors using HTML format
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Description

In Mathematical expression: Simple text input (for T405730), we changed the API errorformat parameter from html to plaintext. However, in the long term we should return to the HTML error format, as it can be more informative (e.g. hyperlinks might have been stripped from the plain text; AbuseFilter errors might have contained an error box).

Acceptance criteria:

All wbui2025 API requests use errorformat=html
HTML errors are displayed correctly (no double-escaping but also no XSS vulnerability)

Details

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	Display errors using HTML format	mediawiki/extensions/Wikibase	master	+35 -13

Customize query in gerrit

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		Status	Subtype	Assigned	Task
		Open		None	T394621 [MEX] Mobile Editing Experience of Items Project
		Resolved		mahmoud.abdelsattar.wmde	T417797 [MEX] Display errors using HTML format

Event Timeline

Lucas_Werkmeister_WMDE created this task.Feb 18 2026, 3:54 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 18 2026, 3:54 PM

karapayneWMDE moved this task from Incoming to Ready for Task Time (Story Writing) on the Wikidata-Omega board.Feb 23 2026, 7:28 PM

mahmoud.abdelsattar.wmde moved this task from Ready for Task Time (Story Writing) to The Backlog on the Wikidata-Omega board.Feb 24 2026, 12:55 PM

Sadiya.Mohammed_WMDE claimed this task.Mar 4 2026, 9:02 AM

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Sadiya.Mohammed_WMDE edited projects, added Wikidata-Omega (The Board); removed Wikidata-Omega.

Sadiya.Mohammed_WMDE moved this task from new to the board to In Development on the Wikidata-Omega (The Board) board.

Change #1247982 had a related patch set uploaded (by Sadiya.mohammed13; author: Sadiya.mohammed13):

[mediawiki/extensions/Wikibase@master] Display errors using HTML format

https://gerrit.wikimedia.org/r/1247982

gerritbot added a project: Patch-For-Review.Mar 4 2026, 12:07 PM

Sadiya.Mohammed_WMDE removed Sadiya.Mohammed_WMDE as the assignee of this task.Mar 4 2026, 3:39 PM

Sadiya.Mohammed_WMDE moved this task from In Development to Ready for Peer Review on the Wikidata-Omega (The Board) board.

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mahmoud.abdelsattar.wmde claimed this task.Mar 10 2026, 2:33 PM

mahmoud.abdelsattar.wmde moved this task from Ready for Peer Review to In Peer Review on the Wikidata-Omega (The Board) board.

I added some comments o the patch.
Thank you!

Sadiya.Mohammed_WMDE reassigned this task from Sadiya.Mohammed_WMDE to mahmoud.abdelsattar.wmde.Mar 12 2026, 3:21 PM

Sadiya.Mohammed_WMDE moved this task from Ready for Development to In Peer Review on the Wikidata-Omega (The Board) board.

mahmoud.abdelsattar.wmde removed mahmoud.abdelsattar.wmde as the assignee of this task.Mar 16 2026, 1:25 PM

mahmoud.abdelsattar.wmde moved this task from In Peer Review to Ready for Peer Review on the Wikidata-Omega (The Board) board.

@Sadiya.Mohammed_WMDE Could you please check the comments in the patch?
Thank you!

Sadiya.Mohammed_WMDE removed Sadiya.Mohammed_WMDE as the assignee of this task.Apr 2 2026, 1:38 PM

Sadiya.Mohammed_WMDE moved this task from Ready for Development to Ready for Peer Review on the Wikidata-Omega (The Board) board.

Lucas_Werkmeister_WMDE claimed this task.Apr 7 2026, 10:20 AM

Lucas_Werkmeister_WMDE moved this task from Ready for Peer Review to In Peer Review on the Wikidata-Omega (The Board) board.

I mentioned this on Gerrit but it seems worth pointing out here too: our effort to display useful errors in HTML is somewhat hampered by the weird structure of errors in Wikibase API responses – see T304945. Maybe now is a good time to tackle that task.

Change #1247982 merged by jenkins-bot:

[mediawiki/extensions/Wikibase@master] Display errors using HTML format

https://gerrit.wikimedia.org/r/1247982

Not sure if this goes into Tech or Product Verification… let’s try Product.

ReleaseTaggerBot added a project: MW-1.46-notes (1.46.0-wmf.26; 2026-04-28).Apr 16 2026, 4:00 PM

Maintenance_bot removed a project: Patch-For-Review.Apr 16 2026, 4:32 PM

Is there an example I can check this one on?

Arian_Bozorg moved this task from Product Verification to In Tech Verification on the Wikidata-Omega (The Board) board.Mon, Apr 20, 1:13 PM

@Arian_Bozorg Sure.

Open any item page.
Create/edit any math expression statement. Type in the value any invalid character like "\".
Or, in URL statement type, use a invalid protocol like "hpsfs://".

(before saving open the browser inspector on the network tab and check for the requests "api.php?..." and check the: