Add zoomKey config to default.revealjs

[reagle]

Easy issue, first raised on the list.

 $if(zoomKey)$ 
         // Modifier key used for click-zoom to part of the slide 
         zoomKey: '$zoomKey$', 
 $endif$ 

[jgm]

Where is this documented? Didn't see it here: https://github.com/hakimel/reveal.js/

[reagle]

As I noted on the list, it is not in the documentation. Nonetheless, the problem is that it can be very difficult to use reveal.js on a Chromebook when alt-clicking a link as it then zooms in as well. It'd be nice if it was configurable in the pandoc template.

[reagle]

Thanks!