public function allowedHtmlTags($init)
    {
        $extend = 'div[*], style[*], script[*], iframe[*], span[*], section[*], article[*], header[*], footer[*]';

        if (isset($init['extended_valid_elements']) && !empty($init['extended_valid_elements'])) {
            $init['extended_valid_elements'] .= ', ' . $extend;
        } else {
            $init['extended_valid_elements'] = $extend;
        }

        return $init;
    }