FYI: Slide Show (S9) also has a impress.js template/theme pack so you can write your talks / slides in plain text with markdown formatting conventions. See https://github.com/slideshow-templates/slideshow-impress.js

If some people are still using impress I am dropping this small library I made a few years ago.

http://frantzmiccoli.github.io/Chillin.js

I have had issues with impress.js when my laptop's resolution was different from the projector's.