same as #195 but with some comments and no changes to the build files
same as #195 but with some comments and no changes to the build files

jsantell/webvr-polyfill,immersive-web/webvr-polyfill,jsantell/webvr-polyfill,marciot/webvr-polyfill,borismus/webvr-polyfill,bkkl/bkkl.github.io,immersive-web/webvr-polyfill,bkkl/bkkl.github.io,marciot/webvr-polyfill,borismus/webvr-polyfill