pyfedi/app/templates/post/_post_notification_toggle.html

<a href="{{ url_for('post.post_notification', post_id=post.id) }}" rel="nofollow"
class="small fe {{ 'fe-bell' if post.notify_author else 'fe-no-bell' }} no-underline"
hx-post="{{ url_for('post.post_notification', post_id=post.id) }}" hx-trigger="click throttle:1s" hx-swap="outerHTML"
title="{{ _('Notify about replies') }}" aria-label="{{ _('Notify about replies') }}"></a>