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Doesn't this make serverless read-only apps (that only require a fileserver) effectively impossible?

In a serverless read-only app, all business logic and state is maintained on the browser.

Serverless and static are different. Static sites will likely be limited to maintaining state in the browser. Serverless is terribly named but still have a short lived server with access to request query parameters, cookies, headers, and a database depending on your setup

You can embed a "backend" as a service worker and use htmx to interact with it. A proof of concept here: https://github.com/richardanaya/wasm-service

This is cool!

A possible extension to HTMX would be to allow this kind of offloading to pure JS functions instead of requiring hacky intercepts.

You would still have a clear separation of responsibilities between frontend rendering (by the browser only) and application logic (which only generates HTML as output).

I've done the same thing with vanilla JS in a service worker. I did it with my HTMF library -- similar to HTMX -- but not production ready and based on forms rather than being able to put your attributes everywhere. I'll have to create a simple to do app with HTMX that shows this same functionality. The Rust one is cool as you can do it with 150kB library. But I can do the same thing with 10kB with just simple JS.

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