magento-test/app/code/Magento/Shipping/view/frontend/templates/tracking/link.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
?>
<?php /** @var $block \Magento\Shipping\Block\Tracking\Link */ ?>
<?php $order = $block->getOrder() ?>
<a href="#" class="action track" title="<?= $block->escapeHtmlAttr($block->getLabel()) ?>"
   data-mage-init='{"popupWindow": {
        "windowURL":"<?= $block->escapeUrl($block->getWindowUrl($order)) ?>",
        "windowName":"trackorder",
        "width":800,
        "height":600,
        "left":0,
        "top":0,
        "resizable":1,
        "scrollbars":1
    }}'>
    <span><?= $block->escapeHtml($block->getLabel()) ?></span>
</a>