.ad-n{animation-direction:normal}
.ad-r{animation-direction:reverse}
.ad-a{animation-direction:alternate}
.ad-ar{animation-direction:alternate-reverse}
npm install minions.animation-direction
<link rel="stylesheet" href="https://unpkg.com/minions.animation-direction" />
The MIT License (MIT)
Copyright (c) 2016 Michael Chan