code: function removeLoadingClass(image, loadingClass) {
    var element = image;
    var shouldReturn = false;
  
    /*
     * Since there may be additional elements wrapping the image (e.g. a link),
     * we run a loop to check the image’s ancestors until we either find the
     * element with the loading class or hit the `body` element.
     */
    while (element.tagName.toLowerCase() !== 'body') {
      if (element.classList.contains(loadingClass)) {
        element.classList.remove(loadingClass);
        shouldReturn = true;
      } else {
        element = element.parentNode;
      }
  
      if (shouldReturn) {
        return;
      }
    }
  }
docs: Remove the loading class from the lazyload wrapper.
  @param  {Element} image        the image being loaded
  @param  {String}  loadingClass the class to remove
  @return {Void}