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Request Animation Frame polyfill.
Deprecated
This polyfill will remain in this org, but will no longer be maintained - which is fine :)
Adapted from https://gist.github.com/paulirish/1579671 which derived from
requestAnimationFrame polyfill by Erik Möller.
Fixes from Paul Irish, Tino Zijdel, Andrew Mao, Klemen Slavič, Darius Bacon
MIT license