Re: [whatwg/fetch] Request.destination for `<link rel=prefetch>` (#658)

I see, in that case we should leave the default as the empty string. I think initiator is the way to go to distinguish it as prefetch. (We could also add a separator initiator for preload if desired.)

If service workers want to know this information at some point we could expose initiator to script, though we should not do so until we've carefully scrutinized it as the existing values are limited to what we needed for specifications only.

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