2
Supravat. I guess that you want to get Content from www.example.com/sales/order/view/order_id/{OrderId}/ when clicking into <h4>
In that, I suggest is that implement ajaxContent of Collapsible widget
that call www.example.com/sales/order/view/order_id/{OrderId}/ and get content of HTML out of Block sales.order.view.
<block class="Magento\Sales\...
1
As per your screenshot, you can add your custom class in the footer block by copying /vendor/magento/module-theme/view/frontend/templates/html/footer.phtml file in your theme with below content.
<div class="footer-container">
<div class="footer">
<?= $block->getChildHtml() ?>
<p class="bugs"><?= /* @...
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