Please check the new Braid HTTP, it's shaping up the as the killer feature of the Web 3 to enable killer web based local-first application [1],[2]:

[1] A Synchronous Web of State:

https://braid.org/meeting-107

[2] Local-first software You own your data, in spite of the cloud:

https://www.inkandswitch.com/essay/local-first/