Function requestAnimationFrame

docs/tests/v2/es6/js/sanddance.js:3081–3083

(callback)

/* global window, setTimeout, clearTimeout */
function requestAnimationFrame(callback) {
  return typeof window !== 'undefined' && window.requestAnimationFrame ? window.requestAnimationFrame(callback) : setTimeout(callback, 1000 / 60);
}

function cancelAnimationFrame(timerId) {
  return typeof window !== 'undefined' && window.cancelAnimationFrame ? window.cancelAnimationFrame(timerId) : clearTimeout(timerId);