.mw-infobox is not following system user messages styles guidelines
- it is using a warning similar styling for a normal infobox
- the border width and margins are single appearances
It should be standardized in appearance and evaluated if those styles are possible to be removed from legacy module.
Current usage
https://codesearch.wmcloud.org/search/?q=mw-infobox&i=nope&files=&repos=
https://gerrit.wikimedia.org/g/mediawiki/core/+/6e5c7e97b4e9ffc320371fba684954f72c6dce04/resources/src/mediawiki.skinning/legacy.less
- sign off steps
- Usage removed in Extension:Translate
- Usage removed in Extension:TranslateNotifications
- Make sure a task exists for removing this along with other styles in 1.37 (see T89981)