Vertical slides

[meghprkh]

Add vertical slide support like RevealJS - https://revealjs.com/vertical-slides/

This can be enabled via an additional separator imo

Allows to organize content more effectively imho

[yhatt]

Surely vertical slides may be helpful to make effective slides, but Marp team is not taking it on purpose because of its low discoverability for audiences.

No, there is not vertical slide in Marp because we think 2 way navigation is hard to notice for audience.

It may resolve by making plugin for Marpit framework, but it would be too hard. Probably continue using reveal.js is the best way if you still want navigation for 2 directions.

-- yhatt/marp-cli-example#7

FYI Marpit framework also can use together with reveal.js: https://codesandbox.io/s/nw80vrxvpp