Topic on Project:Support desk

What  about responsiveness or bootstrap features?

Responsiveness in MediaWiki mostly means responsiveness of the Vector skin. You can watch its development at https://gerrit.wikimedia.org/r/#/q/project:mediawiki/skins/Vector,n,z. Information on how you can contribute yourself are available at Developer access!

Extension:Bootstrap gives you bootstrap features. You can use it in combination with Skin:Chameleon for example.