Reading/Mobile Friendly Content

About
Mediawiki isn't responsive by default. As a result, our Wikipedia content doesn't have a friendly display on mobile. The problem is more visible in pages with templates, tables and navboxes.

Why is this a problem?

 * 1) The web of today is responsive. We don't necessarily have to think mobile first, but we have to consider cross-devices display, especially with more than 50% of page views traffic coming from mobile.
 * 2) The more hidden or garbled content we display, the more readers are detached from Wikipedia, and the less they are able to learn about how it works, and the less engaged they become in discussions
 * 3) Our options of either an incomplete experience, or a garbled/overwhelming display are not sustainable. We have a responsibility towards both our editors and our readers, to enable them to access and interact with out sites in a reasonable experience, and we have a responsibility towards Wikipedia itself.

Focus on enhancing the most garbled display elements: templates, tables and navboxes, this requires:

 * Allow styling in templates
 * Allow mobile review/warning when template isn't mobile friendly
 * Addressing the problem of big tables with possible solutions
 * Enhancing our mobile editing experience to help bring in more content that is mobile friendly by default.
 * Support creating UIs using markup, through OOJS
 * Show preview of mobile to desktop editors