gistfile1.txt

function animationIsInProgress () {
  const docElement = document.body || document.documentElement
  if (typeof docElement.style['transition'] === 'string') {
    return true
  }

  const vendorSpecific = ['Moz', 'webkit', 'Webkit', 'Khtml', 'O', 'ms']
  for (let i = 0; i < vendorSpecific.length; i++) {
    if (typeof docElement.style[vendorSpecific[i] + 'Transition'] === 'string') {
      return true
    }
  }

  return false
}