    public function transform($attr, $config, $context) {
        if (!isset($attr['name'])) return $attr;
        $name = $attr['name'];
        if (isset($attr['id']) && $attr['id'] === $name) return $attr;
        $result = $this->idDef->validate($name, $config, $context);
        if ($result === false) unset($attr['name']);
        else $attr['name'] = $result;
        return $attr;
    }
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.