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In the Fetching section, it speaks of "fully transmitted". Should that be defined or an example given?
What it means exactly kinda depends on how HTTP is implemented. And that in turn is not very well defined...
Maybe a note would be useful there. However, if you think it's ok, please disregard.
https://github.com/whatwg/fetch/commit/984b4498d079766de1e1d32476a41cd67636c379