protected function metaString(): string
    {
        if (!$this->meta) {
            return '';
        }

        return \join(' ', \array_map(function (string $key, $value): string {
            return $this->slugify($key).'="'.$this->escape->attr($value).'"';
        }, \array_keys($this->meta), \array_values($this->meta)));
    }