    protected function parseStartState(ElementNode $parent, Tokenizer $tokenizer)
    {
        $next = $tokenizer->next();

        if ('[' == $next) {
            return $this->parseTagOpen($parent, $tokenizer);
        } else {
            $this->createTextNode($parent, $next);
            /* Drop back into the main parse loop which will call this
             * same method again. */
            return $parent;
        }
    }
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.