if (window.webkitRequestAnimationFrame && window.webkitCancelAnimationFrame) {
    //https://github.com/Financial-Times/polyfill-service/blob/master/polyfills/requestAnimationFrame/polyfill-webkit.js
    (function (global) {
      global.requestAnimationFrame = function (callback) {
        return webkitRequestAnimationFrame(function () {