This is a June 27, 2018 test reply (Webmention) post that's being typed from within the web-based, IndieWeb-compatible feed reader called Monocle, which is a Microsub and a Micropub client.
I'm using Moncole to follow the JSON feed at my wren.soupmode.com site. I added the feed to Aperture, which is a web-based Microsub server that simply manages feeds. The reading part is done by the Micropub client Monocle, which contains IndieWeb functionality, such as replying.
I logged into Aperture and Monocle using sawv.org, via IndieAuth. This reply should appear at sawv.org, and then my code at sawv.org should send the Webmention reply to wren.soupmode.com. I'm replying to the balloon release post.