https://hacks.mozilla.org/2014/11/an-easier-way-of-using-polyfills/ https://hacks.mozilla.org/2014/11/an-easier-way-of-using-pol... also had a small bit on UA o

https://hacks.mozilla.org/2014/11/an-easier-way-of-using-polyfills/ https://hacks.mozilla.org/2014/11/an-easier-way-of-using-pol... also had a small bit on UA over feature-detection