Expose showPreview
Expose showPreview

rbtcollins/reveal.js,kenkunz/js-crash-course,hakimel/reveal.js,lvh/reveal.js,rbtcollins/reveal.js,kenkunz/js-crash-course,lvh/reveal.js,10xEngineer/reveal.js,rbtcollins/reveal.js,rbtcollins/reveal.js,10xEngineer/reveal.js,rbtcollins/reveal.js,rbtcollins/reveal.js,hakimel/reveal.js