Templates can also produce legacy DOM, expecting the skin to style it (e.g. hu:Sablon:Széles kép), and/or consume the DOM using TemplateStyles. These also need to be checked, and I think they could be in the scope of this ticket.

These also need to be checked, and I think they could be in the scope of this ticket.

Yes, thank you, I've updated the task title to reflect that. Here's an example T287963#8234537 from one of the early adopter wikis T314318 where we've been preparing templatestyles for the change.

Templates can also produce legacy DOM, expecting the skin to style it expecting the skin to style it (e.g. hu:Sablon:Széles kép)

This particular example should be unaffected since, for the moment, we aren't removing the old styling rules. But, yes, getting all the on wiki content that mimics the parser output ported to the new styling rules will be a longer term goal.

Work on Gadget-Direct-link-to-Commons.js was started in T314318#8216188 and the change to the snippet needs porting to all the affected wikis P896
https://www.mediawiki.org/w/index.php?title=Snippets%2FDirect_imagelinks_to_Commons&type=revision&diff=5451422&oldid=3976429

Gadget-WikiMiniAtlas.js needs inspection, https://meta.wikimedia.org/w/index.php?title=MediaWiki:Wikiminiatlas.js

// remove icons from title coordinates
$('#coordinates,#coordinates-title,#tpl_Coordinaten').find('a.image').detach();

This particular example should be unaffected since, for the moment, we aren't removing the old styling rules. But, yes, getting all the on wiki content that mimics the parser output ported to the new styling rules will be a longer term goal.

https://en.wikipedia.org/wiki/Template:Multiple_image looks like another one

Gadget-WikiMiniAtlas.js needs inspection, https://meta.wikimedia.org/w/index.php?title=MediaWiki:Wikiminiatlas.js

I've requested this change, https://meta.wikimedia.org/wiki/MediaWiki_talk:Wikiminiatlas.js#Prepare_for_T314318
and,
https://github.com/dschwen/wikiminiatlas/pull/39

I've requested this change, https://meta.wikimedia.org/wiki/MediaWiki_talk:Wikiminiatlas.js#Prepare_for_T314318

https://meta.wikimedia.org/w/index.php?title=MediaWiki%3AWikiminiatlas.js&type=revision&diff=23833370&oldid=22661610
https://github.com/dschwen/wikiminiatlas/commit/ca5427505eb2c2a86936df963f02168ce18f2eb6

In T297447#8247013, @Arlolra wrote:

This particular example should be unaffected since, for the moment, we aren't removing the old styling rules. But, yes, getting all the on wiki content that mimics the parser output ported to the new styling rules will be a longer term goal.

https://en.wikipedia.org/wiki/Template:Multiple_image looks like another one

Probably the easiest way to identify them is to use either global search (or just local search) looking for any/all of the relevant HTML classes associated with the old structure.

From https://vi.wikipedia.org/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:GadgetUsage

56 users (10 active) have this dark mode gadget enabled and should be updated,
https://en.wikipedia.org/wiki/User:Volker_E._(WMF)/dark-mode

Similar to T297447#8248831, https://vi.wikipedia.org/wiki/MediaWiki:Gadget-OpenStreetMap.js has $("#coordinates img").off("click").remove(); but that's probably fine as is

In T297447#8330857, @Arlolra wrote:

From https://vi.wikipedia.org/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:GadgetUsage

56 users (10 active) have this dark mode gadget enabled and should be updated,
https://en.wikipedia.org/wiki/User:Volker_E._(WMF)/dark-mode

Similarly on itwiki, 127 users (7 active)
https://it.wikipedia.org/wiki/MediaWiki:Gadget-dark-mode.css

In T297447#8330857, @Arlolra wrote:

From https://vi.wikipedia.org/wiki/%C4%90%E1%BA%B7c_bi%E1%BB%87t:GadgetUsage

56 users (10 active) have this dark mode gadget enabled and should be updated,
https://en.wikipedia.org/wiki/User:Volker_E._(WMF)/dark-mode

I've requested a change,
https://en.wikipedia.org/wiki/Wikipedia_talk:Dark_mode_(gadget)#Prepare_for_T314318
https://en.wikipedia.org/wiki/Special:ComparePages?page1=MediaWiki%3AGadget-dark-mode.css&rev1=&page2=User%3AArlolra%2Fsandbox%2FMediaWiki%3AGadget-dark-mode.css&rev2=&action=&unhide=&diffmode=source

In T297447#8354269, @Arlolra wrote:

I've requested a change,
https://en.wikipedia.org/wiki/Wikipedia_talk:Dark_mode_(gadget)#Prepare_for_T314318
https://en.wikipedia.org/wiki/Special:ComparePages?page1=MediaWiki%3AGadget-dark-mode.css&rev1=&page2=User%3AArlolra%2Fsandbox%2FMediaWiki%3AGadget-dark-mode.css&rev2=&action=&unhide=&diffmode=source

Done in https://en.wikipedia.org/w/index.php?title=MediaWiki%3AGadget-dark-mode.css&type=revision&diff=1119248845&oldid=1101625928

Some more to look into,

arlolra@mwmaint1002:~$ mwgrep "thumbimage" --max-results 200

...

enwiki              MediaWiki:Gadget-ImageAnnotator.js
enwiki              MediaWiki:Gadget-NewImageThumb.css
enwiki              MediaWiki:Gadget-responsiveContentBase.css
enwiki              MediaWiki:Gadget-responsiveContentBaseTimeless.css

enwiki MediaWiki:Gadget-ImageAnnotator.js

This one seems fine but belongs in T318433