[w3ctag/design-reviews] deliveryType (Resource Timing) (Issue #858)

こんにちは TAG-さん!

I'm requesting a TAG review of deliveryType (part of Resource Timing).

Resources on the web are usually fetched via HTTP (from the origin server), but in some cases they are known to be delivered from a cache or other buffer, in a way that affects loading performance. Insight into this is useful for authors understanding when these caches accelerate resource loading. The deliveryType attribute on PerformanceResourceTiming addresses this, with the following values: `""` (no more specific delivery type applies), `"cache"` (the resource was served from the cache), `"navigational-prefetch"` (the resource was prefetched for navigation from another page).

  - Explainer¹ (minimally containing user needs and example code): https://gist.github.com/jeremyroman/43f8f290f1f404d3b7f6cb708601c7f0
  - Specification URL: https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-deliverytype
  - Tests: resource-timing/delivery-type.tentative.any.js, speculation-rules/prefetch/navigation-timing-delivery-type.tentative.https.html
  - User research: no formal research, though a developer has used this API without significant difficulty in origin trial
  - Security and Privacy self-review²: https://gist.github.com/jeremyroman/43f8f290f1f404d3b7f6cb708601c7f0#file-security-privacy-questionnaire-md
  - Primary contacts (and their relationship to the specification):
      - Jeremy Roman (@jeremyroman), Google LLC
      - William Liu (@superliuxz), Google LLC
  - Organization(s)/project(s) driving the specification: Google LLC
  - Key pieces of existing multi-stakeholder review or discussion of this specification:
      - Web Performance Working Group (e.g., [2022-02-03](https://w3c.github.io/web-performance/meetings/2022/2022-09-01/index.html), [2022-04-28](https://w3c.github.io/web-performance/meetings/2022/2022-04-28/index.html), w3c/resource-timing#343, w3c/navigation-timing#163
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status):
      - https://chromestatus.com/feature/6347141115543552

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Relevant time constraints or deadlines: I am hoping to ship this single attribute addition relatively soon in Chrome. It has previously been discussed in the WPWG context, but as part of this process it was suggested that we get TAG's opinion as well. A quick response would be appreciated; I hope that given the small scope of this feature and prior attention that significant revision won't be necessary.
  - The group where the work on this specification is currently being done: Web Performance Working Group
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): Web Performance Working Group
  - Major unresolved issues with or opposition to this specification: none known
  - This work is being funded by: Google LLC

We'd prefer the TAG provide feedback as (please delete all but the desired option):
  💬 leave review feedback as a **comment in this issue** and @-notify @jeremyroman

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