only force media controls to be visible when necessarry
only force media controls to be visible when necessarry

hakimel/reveal.js,uggla/reveal.js,denehyg/reveal.js,lvh/reveal.js,kenkunz/js-crash-course,lecovi/reveal.js,maximesinclair/presentations,rbtcollins/reveal.js,rajgoel/reveal.js,dbs/reveal.js,siddhartha-gadgil/presentations,rbtcollins/reveal.js,agross/git-reveal,DiUS/reveal.js,lvh/reveal.js,Jean85/reveal.js,rajgoel/reveal.js,lecovi/reveal.js,dbs/reveal.js,siddhartha-gadgil/presentations,fbecart/Presentations,lecovi/reveal.js,Jean85/reveal.js,tehfedaykin/10CommandmentsofCommunityOrganizing,jlevallois/Kreveal.js,christofmarti/reveal.js,seefood/DIYHolidays,denehyg/reveal.js,10xEngineer/reveal.js,tehfedaykin/10CommandmentsofCommunityOrganizing,jlevallois/Kreveal.js,fbecart/Presentations,agross/git-reveal,jayramj/agile-retro,maximesinclair/presentations,10xEngineer/reveal.js,hakimel/reveal.js,christofmarti/reveal.js,kenkunz/js-crash-course,stefan-langenmaier/reveal.js,seefood/DIYHolidays,rbtcollins/reveal.js,stefan-langenmaier/reveal.js,siddhartha-gadgil/presentations,uggla/reveal.js,rbtcollins/reveal.js,rbtcollins/reveal.js,DiUS/reveal.js,jayramj/agile-retro,rbtcollins/reveal.js