Webmention is a simple way to notify any URL when you mention it on your site. From the receiver's perspective, it's a way to request notifications when other sites mention it. Webmention W3C
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From IndieWeb Summit 2018, posted by Jim Pick [dat://fritter.hashbase.io/thread/dat://c6740b08b319265079ebb9da98ee11a01da5d5379ca5d0ef12fa539403532372/posts/0jizb0zr7.json fritter]
I snipped out @gozala 's show-and-tell from IndieWeb Summit and uploaded it to Hashbase... dat://indieweb-summit-2018.hashbase.io/ind... His demo shows sending a Webmention from inside Beaker Browser! This is what a Webmention is... https://indieweb.org/Webmention To run the demo yourself, load up a test page where you can make a webmention, eg. https://webmention.rocks/test/1 Then go here, and write a comment which will be used as a webmention: dat://d58a4ed2df295e9c994c3f4a6934b3e946ab5e497f65cd2c7ab6adbb26d9ae9f/ You will be prompted to select a Dat from your library or to create a new one to hold the webmention data. Just create a new one with a creative name you will remember ... eg. "webmentions". If all goes well, behind the scenes, the webmention will be saved to dat, and relayed to the test page ... behind-the-scenes, there's a gateway that does that for you, and which also proxies your dat content. If you go back to the page you commented on, you should see your comment! https://webmention.rocks/test/1 The demo uses a Node.js gateway server which lives here... (you shouldn't have to touch it) https://glitch.com/edit/#!/datmention
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See also Wiki and Glitch