code: function isChild(child, parent) {
  	while (child = child.parentNode) {
  		if (child == parent) {
  			return true;
  		}
  	}
  
  	return false;
  }
docs: Returns true if one element is a child of the other
  
  @author   Jelle De Loecker   <jelle@develry.be>
  @since    1.2.2
  @version  1.2.2
  
  @param    {HTMLElement}   element
  
  @return   {Boolean}