[w3ctag/design-reviews] Early Design Review: Page Unload Beacon API (Issue #776)

Wotcher TAG!

I'm requesting a TAG review of Page Unload Beacon API.

This is a proposal for [Page Unload Beacon API](https://github.com/WICG/unload-beacon/blob/main/README.md). It is a system for sending beacons when pages are discarded, that uses a stateful API rather than having developers explicitly send beacons themselves.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/WICG/unload-beacon/blob/main/README.md

  - User research: currently only feedback from RUM providers
  - Security and Privacy self-review²: https://github.com/WICG/unload-beacon/blob/main/security-privacy-questionnaire.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/WICG/unload-beacon

  - Primary contacts (and their relationship to the specification):
      - Ming-Ying Chung (mingyc), Google - designing/implementing in Chrome
      - Ian Clelland (clelland), Google - specifying in Chrome
  - Organization/project driving the design: Google (BFCache team)
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5690553554436096


Further details:

  - [✓] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future): WICG
  - 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: https://w3c.github.io/web-performance/meetings/2022/2022-03-31/index.html

  - Major unresolved issues with or opposition to this design: https://github.com/WICG/unload-beacon/issues

  - This work is being funded by: Google

You should also know that...

[please tell us anything you think is relevant to this review]

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 @mingyc and @fergald



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