CSS アニメーションを一時停止する – Qiita
http://qiita.com/junya/items/8de71adeab0312d94dff

animation-play-state: running;
animation-play-state: paused;

memomemo

iPhoneで聞いてないやんけワレェ

-webkit-animation-play-state not working on iOS 8.1 (probably lower too) – Stack Overflow
http://stackoverflow.com/questions/27362216/webkit-animation-play-state-not-working-on-ios-8-1-probably-lower-too