    public function asText(ElementNode $el)
    {
        if (!$this->hasValidInputs($el)) {
            return $el->getAsBBCode();
        }

        $s = "";
        foreach ($el->getChildren() as $child)
            $s .= $child->getAsText();
        return $s;
    }
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.