[w3ctag/design-reviews] Same-origin prerendering triggered by speculationrules (#667)

Ya ya yawm TAG!

I'm requesting a TAG review of same-origin prerendereing triggered by speculationrules.

This feature is about the specific case of same-origin prerendering triggered by the [speculation rules API](triggers.md). 

This feature enables authors to provide a hint to the browser to prerender a URL, so the end-user can experience a near-instantaneous page load if that URL is visited.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/jeremyroman/alternate-loading-modes/blob/main/same-origin-explainer.md

  - Security and Privacy self-review²: https://github.com/mfalken/alternate-loading-modes/blob/sec-priv/same-origin-security-privacy-questionnaire.md (will update the URL upon merge to the main repo)
  - GitHub repo (if you prefer feedback filed there): https://github.com/jeremyroman/alternate-loading-modes

  - Primary contacts (and their relationship to the specification):
      - Matt Falkenhagen (mfalken), Google, contributor
      - Domenic Denicola (domenic), Google, editor
  - Organization/project driving the design: Google Chrome
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5355965538893824


Further details:

  - ✅ I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future): WICG (future)
  - The group where standardization of this work is intended to be done ("unknown" if not known): WHATWG
  - Existing major pieces of multi-stakeholder review or discussion of this design: n/a
  - Major unresolved issues with or opposition to this design: none known
  - This work is being funded by: Google

You should also know that...

This feature is related to #611 in that it is a specific case of that triggering mechanism.

It is also related to #613, which is a particular API exposed by this feature.

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  ☂️ open a single issue in our GitHub repo **for the entire review**


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