Change 416708 had a related patch set uploaded (by Zoranzoki21; owner: Zoranzoki21):
[operations/mediawiki-config@master] Deploy TemplateStyles to frwiki and zhwiki

https://gerrit.wikimedia.org/r/416708

@Lofhi I'm so glad the French Wikipedians are interested in TemplateStyles!

As noted above, TemplateStyles can't be deployed until the RemexHtml migration is completed. If you'd like to help speed that up, I suggest reading the instructions for editors on how to help with the migration. If you can reduce the number of high priority lint errors, you can be switched over to Remex earlier, then TemplateStyles can be deployed. Don't be intimidated by the number of errors that are there, because many errors could come from templates that, if fixed, might resolve hundreds of errors all at once.

Thanks!

This task is about French Wikipedia, but Deskana's link goes to French Wiktionary. Here's the relevant link: https://fr.wikipedia.org/wiki/Spécial:LintErrors

In T191452#4111601, @Nirmos wrote:

This task is about French Wikipedia, but Deskana's link goes to French Wiktionary. Here's the relevant link: https://fr.wikipedia.org/wiki/Spécial:LintErrors

Oops. Thanks!

@Deskana We are aware of these problems and this background maintenance is already done by several contributors in the shadows. It'll take a little time...

In T191452#4114817, @Lofhi wrote:

@Deskana We are aware of these problems and this background maintenance is already done by several contributors in the shadows. It'll take a little time...

No problem! Sounds good to me. :-)

Please read T197603#4297301 for relevant information.

Change 446586 had a related patch set uploaded (by Gergő Tisza; owner: Zoranzoki21):
[operations/mediawiki-config@master] Deploy TemplateStyles to frwiki and zhwiki

https://gerrit.wikimedia.org/r/446586

Change 416708 abandoned by Zoranzoki21:
Deploy TemplateStyles to frwiki and zhwiki

Reason:
Abandoning as per T199909

https://gerrit.wikimedia.org/r/416708

Change 416708 restored by Gergő Tisza:
Deploy TemplateStyles to frwiki and zhwiki

https://gerrit.wikimedia.org/r/416708

Change 416708 abandoned by Gergő Tisza:
Deploy TemplateStyles to frwiki and zhwiki

Reason:
looks like gerrit created a new version when I rebased this: https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/ /446586

https://gerrit.wikimedia.org/r/416708

Change 446586 merged by Gergő Tisza:
[operations/mediawiki-config@master] Deploy TemplateStyles to frwiki and zhwiki

https://gerrit.wikimedia.org/r/446586

Mentioned in SAL (#wikimedia-operations) [2018-07-19T11:18:43Z] <tgr@deploy1001> Synchronized wmf-config/InitialiseSettings.php: enable TemplateStyles on enwiki, frwiki, zhwiki T197603 T191452 T189022 (duration: 00m 55s)

Hi @Deskana, it's a little off topic, but I can't find an adequate answer.

While starting to clean Commons.css, one of the administrators wondered if TemplateStyles might extend the loading time (parsing, possible duplication, ...). Do we know if this has a negative impact on performance?

Also, I couldn't find anything about Lua. Is it recommended to add a templatestyles tag in the wikitext returned by a module?

That sounds like a good question for https://www.mediawiki.org/wiki/Extension_talk:TemplateStyles so someone else could also find it (as it's not directly related to deploying on French Wikipedia only what this task is about)?

While starting to clean Commons.css, one of the administrators wondered if TemplateStyles might extend the loading time (parsing, possible duplication, ...). Do we know if this has a negative impact on performance?

See T185853. Even in the worst case scenario (i.e. in the migration period when styles in the MediaWiki namespace and styles from TemplateStyles are loaded at the same time) there was no measurable change in performance. In theory, TemplateStyles would be good for sparsely used templates, and bad for ubiquitous templates, but since we did not observe any such thing, my guess is that the amount of CSS that is local to a wiki is so small in proportion to the total amount of CSS. Unfortunately, I don't have any numbers to support that – it's just a gut feeling.

With regard to multiple invocations of the same template on the same page, the styles are deduplicated since T168333, although it's unclear if this was needed at all.

Also, I couldn't find anything about Lua. Is it recommended to add a templatestyles tag in the wikitext returned by a module?

It is possible to add a templatestyles tag in a Lua module, like this:

return frame:extensionTag( 'templatestyles', '', { src = 'Infobox/styles.css' } )

Or you can do it in wikitext:

<templatestyles src="Infobox/styles.css" />{{#invoke:infobox}}

It doesn't matter which one you choose. What does matter is that the templatestyles tag is added first, at the very top, otherwise you'll experience a FOUC.

Thanks for the advice @Aklapper (I will avoid asking my questions here in the future) and thanks for the complete answer @Nirmos !

Just to clarify, I was precisely concerned about TemplateStyles in small templates invoked many times. More precisely:

• Server-side: all processing time for parsing, deduplicating, etc. (CPU/RAM usage)
• Client-side (which I'm more worried about): cost of markup bloat with the numerous added <link> tags (page size, also CPU/RAM usage)

Compared to a simple, shared CSS ruleset, which is even cached by the client.