v4.0 Tabs and Carousel. Up for discussion. 

Broke tabbed interface into two plugins: Carousel (for slider-like functionality), and Tabs (using Toggle and summary/details to be mobile-friendly). Couldn't find an efficient way (no DOM manipulation) way for the carousel plugin to handle stacking content vertically when the screen gets too small to show all the tabs in one row. Switching the DOM structure to one based on summary/details solves this issue.