I am stuck in very simple thing in my plugin where i am trying to extend checkout section but nothing happens and this issue only happend in checkout although i did extend detail section which works fine.Can you please figure out what i am doing wrong ?? here is the code snippets :
{extends file="parent:frontend/checkout/items/product.tpl"}
{block name='frontend_checkout_cart_item_details' }
<div class="panel--td table--content">
{block name='frontend_checkout_cart_item_details_comments'}
<input type="hidden" name="h" value="testing comments">
testing
{/block}
</div>
{/block}