function isElementRemoved(el) {
  if (!el.__zr) {
    return true;
  }

  for (var i = 0; i < el.animators.length; i++) {
    var animator = el.animators[i];

    if (animator.scope === 'remove') {
      return true;
    }
  }

  return false;
}
If element is removed.
It can determine if element is having remove animation.