newsupernova/vendor/magento/module-tax/view/adminhtml/templates/toolbar/class/save.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile

?>
<div data-mage-init='{"floatingHeader": {}}' class="page-actions">
    <?= $block->getBackButtonHtml() ?>
    <?= $block->getResetButtonHtml() ?>
    <?= $block->getSaveButtonHtml() ?>
</div>
<?php if ($form): ?>
<?= $form->toHtml() ?>
<script>
require(['jquery', "mage/mage"], function(jQuery){

    jQuery('#<?= /* @escapeNotVerified */ $form->getForm()->getId() ?>').mage('form').mage('validation');

});
</script>
<?php endif; ?>