There’s also the Linked Data Event Streams (LDES) standard, which is a way of hosting a log as a set of linked http documents, fetched via polling and link navigation. Is there really anything more needed than a webhook for the notification and an LDES for the log?

https://semiceu.github.io/LinkedDataEventStreams/releases/1....

Is it accurate to say this is something like long polling except you continue to hold the connection open for subsequent updates? Does this mean a server potentially needs to hold open a very large number of connections (one per client) even if there are no updates?

And why formalize on HTTP rather than on a similar protocol over websockets?

I reached out through email :)

Just one correction. My spec doesn't force /scroll/ URL's, just proposes it as a convention.