        } elseif ($token instanceof HTMLPurifier_Token_End) {
            $_extra = '';
            if ($this->_flashCompat) {
                if ($token->name == "object" && !empty($this->_flashStack)) {
                    // doesn't do anything for now
                }
            }
            return $_extra . '</' . $token->name . '>';

        } elseif ($token instanceof HTMLPurifier_Token_Empty) {
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.