newsupernova/vendor/magento/module-ui/view/base/templates/form/default.phtml

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

// @codingStandardsIgnoreFile
/**
 * @var \Magento\Ui\Component\Form $block
 */
/* @escapeNotVerified */ echo $block->renderChildComponent('before_form');
?>
<div data-role="spinner" data-component="<?= /* @escapeNotVerified */ $block->getName() ?>.areas" class="admin__data-grid-loading-mask">
    <div class="grid-loader"></div>
</div>
<div data-bind="scope: '<?= /* @escapeNotVerified */ $block->getName() ?>.areas'" class="entry-edit form-inline">
    <!-- ko template: getTemplate() --><!-- /ko -->
</div>
<?php
echo $block->renderChildComponent('after_form');