Re: [whatwg/fetch] Use `,` rather than `, ` for combine operation (#207)

That looks pretty good. I prefer the principles under https://www.w3.org/TR/html-design-principles/#interoperability more I think, but it's quite similar.

I think a problem with @martinthomson's work is that if you are maximally strict, extensions will be trickier or need to be negotiated. We have many client-side formats where you can add new things, before all clients support them, and nothing breaks down for the end user if you do. This is true for protocols too, including a new header doesn't cause a "corrupted content" screen to appear in an older Firefox. What is important is that it's defined what happens, not that you immediately treat such occurrences as fatal errors.

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