Re: [w3ctag/design-reviews] Design Review: Speculation Rules (Prefetch) (Issue #721)

Just adding a quick update here. We're planning on launching an origin trial which covers some of the extended aspects of this, some of which TAG previously provided feedback on:

- document rules (which incorporated feedback from https://github.com/w3ctag/design-reviews/issues/721#issuecomment-1101600240 to use a more general way of expressing the logic)
- [the `Speculation-Rules` header](https://wicg.github.io/nav-speculation/speculation-rules.html#speculation-rules-header), which is a fairly simple structured field which allows loading rules from a URL provided in the response headers (this is of particular use in cases where it is not convenient to modify document content, but the server operator is a service provider which is well-positioned to specify rules in coordination with the document author)
- [PerformanceResourceTiming.deliveryType](https://github.com/w3c/resource-timing/pull/343), which is a fairly small API addition we've discussed with Web Perf WG; relevance here is that it can be used to determine whether the current navigation was served from the prefetch cache

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