pyfedi/app/templates/post/_reply_notification_toggle.html

<a href="{{ url_for('post.post_reply_notification', post_reply_id=comment['comment'].id) }}" rel="nofollow"
class="pl-2 small fe {{ 'fe-bell' if comment['comment'].notify_author else 'fe-no-bell' }} no-underline"
hx-post="{{ url_for('post.post_reply_notification', post_reply_id=comment['comment'].id) }}" hx-trigger="click throttle:1s" hx-swap="outerHTML"
title="{{ _('Notify about replies') }}"></a>