hakimel/reveal.js — pull request #819 by TobbenTM (2014-03-10 16:46:31+00:00)
Title: Added option to force vertical parallax effect

Implemented option to force vertical scrolling of background when there are no vertical navigation in presentation.

Thought it might be handy. :)

Created a quick demo here: http://tobbentm.com/5f5/

Let me know what you think.