magento-test/app/code/Magento/Cms/view/frontend/templates/meta.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
?>
<?php if ($pageData->getPageMetaKeywords()) : ?>
    <meta name="keywords" content="<?= /* @noEscape */ $pageData->getPageMetaKeywords() ?>"/>
<?php endif; ?>
<?php if ($pageData->getPageMetaDescription()) : ?>
    <meta name="description" content="<?= /* @noEscape */ $pageData->getPageMetaDescription() ?>"/>
<?php endif; ?>