[qwtel]

No sure if I’m missing something, but you can tap directly into the readable stream of fetch which should be at least as good as progress events? I’ve used it here (https://sqliteviewer.app/, click “load a sample”) and it works as expected.

[RobertRoberts]

Well, I have something new to try... (just glanced at your project)

If this works, why isn't this documented in an obvious manner on something like MDN?