Help make sure relevant editors on the wikis have a decent chance to learn about [[ https://www.mediawiki.org/wiki/Extension:TemplateStyles | TemplateStyles ]].
TemplateStyles will store CSS in templates on a separate page.
This way, styles in stylesheets can be referred to by several templates. Small templates are not styled well for mobile, which is a problem given the number of readers who come from mobile. This will make it easier to have different styles for mobile and desktop. We should also have an ongoing conversation with the communities as to what can, within reason, be done with style sheets. Is there anything they'd like to do that can't that we could do with this?
Reading wants CL support for this. Template editors should be aware of what's happening and understand why we consider it important, our templates have mobile-friendly styles (not necessarily the same as for desktop), and template editors should know how to do different styles for desktop and mobile, which we should make as easy as possible for them.
No specific timeline. Could continue through the WMF fiscal year of 2017/2018, but the sooner the better.