    protected function writeHTMLDiv($html) {
        $this->startElement('div');

        $purifier = HTMLPurifier::getInstance();
        $html = $purifier->purify($html);
        $this->writeAttribute('xmlns', 'http://www.w3.org/1999/xhtml');
        $this->writeRaw($html);

        $this->endElement(); // div
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.