jQuery - Add element before element with .insertBefore()

Question

if ($('body').hasClass('front') || (dfpInArticleId.css('display') == 'none')) {
  inArticleUnit.hide();
  console.log('front or none');
}
else { 
  if ($(window).width() < 768) {
    inArticleUnit.insertBefore(inArticleInsertM);
    inArticleUnit.show();
  }
  else {
    inArticleInsert.append(inArticleUnit);
    inArticleUnit.show();
  }
  console.log('in-article appear');
}