Seems to be stalled after an inconclusive discussion on 2014-03-26: https://www.mediawiki.org/wiki/Architecture_meetings/RFC_review_2014-03-26

** ''LINK:'' https://www.mediawiki.org/wiki/Requests_for_comment/Allow_styling_in_templates  (sumanah, 21:11:10)
** ''LINK:'' https://www.mediawiki.org/wiki/Requests_for_comment/Deprecating_inline_styles was an older RfC that Jon abandoned in favour of "Allow styling in templates"  (sumanah, 21:11:10)
** ''LINK:'' https://www.mediawiki.org/wiki/Talk:Architecture_Summit_2014/UI_styling#Allow_styling_in_templates We discussed this topic during the Architecture Summit in January  (sumanah, 21:11:10)
** the next steps from January said - Jon & friends would lock down some details, code up a prototype/working beta with some sample templates, and so on by about the end of March.  (sumanah, 21:11:31)
** Jon wants: "some agreement on the way forward and someone with time to write the code to get this kicked off :)  i've been a bit swamped recently"  (sumanah, 21:12:00)
** (we were supposed to talk about this in February https://www.mediawiki.org/wiki/Architecture_meetings/RFC_review_2014-02-27 but ran out of time in that meeting)  (sumanah, 21:12:54)
** ''LINK:'' https://www.mediawiki.org/wiki/Requests_for_comment/Associated_namespaces  (marktraceur, 21:14:15)
** Jon looked at supporting style tags rather than separate wiki pages for styles, per discussion at the summit, and it was nasty and required messing with the parser.  https://gist.github.com/anonymous/9262427  (sumanah, 21:23:36)
** discussion of having a separate Template:Foo.css page; see https://gerrit.wikimedia.org/r/68123  (sumanah, 21:23:36)
** discussion of sanitizing/making secure CSS and <style> content, and performance implications of having a separate CSS bundle  (sumanah, 21:23:36)
** ''IDEA:'' could we have ResourceLoader bundle it?  (sumanah, 21:23:36)
** ''HELP:'' Jon needs help writing the code to get this kicked off  (sumanah, 21:30:20)
** <YuviPanda> However we do this, this would definitely need ops buy in of some sort (at least notifications)  (sumanah, 21:33:01)