Some sites set site-specific JS/CSS in MediaWiki:Common.js / MediaWiki:Common.css which will need updates when output is changed.
Ex: https://ar.wikipedia.org/wiki/%D9%85%D9%8A%D8%AF%D9%8A%D8%A7%D9%88%D9%8A%D9%83%D9%8A:Common.css
Also see https://github.com/wikimedia/integration-visualdiff/blob/master/lib/parsoid.custom_styles.yaml for some mods around this.
This may need some upfront communication to update before rolling out on those wikis with custom mods.
From T271114#8350994,
A common styling that wikis have is a minimum width for a thumb.
/* Minimum thumb width */
.thumbinner {
min-width: 100px;
}A suggested edit to preserve that looks like,
https://it.wikipedia.org/w/index.php?title=MediaWiki%3ACommon.css&type=revision&diff=130152006&oldid=127986303
Though that doesn't exactly account for padding, as in the following, if you wanted pixel diff matching,
https://github.com/wikimedia/integration-visualdiff/blob/a65bef82fd9247d58b11a2e28eae7636ee32c67d/lib/parsoid.custom_styles.yaml#L475-L484
Two queries to surface wikis that would need updating are:
- P38161 - mwgrep --title "Common.css" "Minimum thumb width"
- P38162 - More generally, mwgrep --title "Common.css" "thumbinner"
- Talk page notifications sent
From T271114#8351603,
A common template that wikis have implemented is for a series of images. The images are selected to be stepped through based on a class which is no longer emitted,
var $images = $( imageGroupUnits ).children( '.center' );
A suggested edit to preserve the functionality is,
https://it.wikipedia.org/w/index.php?title=MediaWiki%3ACommon.js&type=revision&diff=130157033&oldid=127743689
Similarly, a bit more work may be needed,
https://ca.wikipedia.org/w/index.php?title=MediaWiki%3ACommon.js&diff=31055727&oldid=24309161
https://ca.wikipedia.org/wiki/Especial:ComparePages?page1=MediaWiki%3ACommon.js&rev1=31055727&page2=Usuari%3AArlolra%2Fsandbox%2FMediaWiki%3ACommon.js&rev2=31058458&action=&unhide=
A query to surface wikis that would need updating is:
- P38163 - mwgrep --title "Common.js" "ImageGroup"
- Talk page notifications sent
From T271114#8541803,
A common styling that wikis have to make the background of a framed image white instead of gray,
div.thumb .thumbimage {
background-color: #fff;
}
// or
div.thumb div a img {
background-color:#f8f9fa;
}A query to surface wikis that would need updating is:
- P43436 - mwgrep --title "Common.css" "Only visible with transparent images"
- Talk page notifications sent
- The default styling shipped with MediaWiki has this in the media feature already, from T154077. It looks like cleanup happened on enwiki but it was left around on other wikis that may have copied it beforehand. The notifications should be to remove it as unnecessary.