[whatwg/fetch] Define behavior in the presence of TLS Early Data (#888)

https://tools.ietf.org/html/rfc8470 specifies the 425 Response Code, but it is silent about how it should be exposed within the Web APIs.

I presume that it should be defined in such a way that:

* Page resources (destination != "") and navigation will be requested with early data as long as they don't have query parameters and use idempotent methods.

* Script requests are off-by-default, even if they're idempotent, but can explicitly turn it on.

* Subresource integrity will turn it on.

* 425 Too Early does not get reported to script. Like 304 Not Modified.

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Received on Monday, 1 April 2019 16:58:26 UTC