I like the potential for sending minimal document elements/objects, though it seems like HTMX/Intercooler/Unpoly features should be built into the browser. Unpoly, for example, has its own entire reimplementation of fetch():

https://github.com/unpoly/unpoly/blob/4854c7ccb268890a9522c6...

and it uses several X-HTTP-Headers, which could be standardized.

Do any browsers have the early workings of a "native web application sdk"?