/**
* Adds new child elements to the front of this InstantArticle
*
* @param Element to be added to this Article.
*
* @return $this
*/
public function unshiftChild($child)
{
Type::enforce($child, [Ad::getClassName(), Analytics::getClassName(), AnimatedGIF::getClassName(), Audio::getClassName(), Blockquote::getClassName(), Image::getClassName(), H1::getClassName(), H2::getClassName(), Interactive::getClassName(), ListElement::getClassName(), Map::getClassName(), Paragraph::getClassName(), Pullquote::getClassName(), RelatedArticles::getClassName(), Slideshow::getClassName(), SocialEmbed::getClassName(), Video::getClassName()]);
array_unshift($this->children, $child);
return $this;
}
