[w3ctag/design-reviews] WebXR Anchors Module (#479)

Hello TAG!

I'm requesting a TAG review of WebXR Anchors Module.

An anchor is a concept that allows applications to specify poses (a position and orientation in three dimensional space) that will be tracked by the underlying system. There are systems where pose tracking is based on their understanding of the world. That understanding, and thus the pose of an anchor, varies over time. Anchors allow a developer to specify poses in the world that need to be updated to correctly reflect the evolving understanding of the world, such that the poses remain aligned with the same place in the physical world.

The main idea behind the concept of an anchor is that as the underlying platform's understanding of the world evolves over time, the anchor pose will be updated such that it remains aligned with the same place in the physical world.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/immersive-web/anchors/blob/master/explainer.md

  - Security and Privacy self-review²: https://github.com/immersive-web/anchors/blob/master/security-privacy-questionnaire.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/immersive-web/anchors

  - Primary contacts (and their relationship to the specification):
    - Piotr Bialecki, @bialpio, Google, Editor
    - Trevor F. Smith, @TrevorFSmith, CG Chair
    - Ada Rose Cannon, @AdaRoseCannon, Samsung, WG Chair
    - Chris Wilson, @cwilso, Google, WG Chair
  - Organization/project driving the design: Immersive Web CG
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5129925015109632


Further details:

  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the work on this design is being done (or is intended to be done in the future): Immersive Web CG
  - Existing major pieces of multi-stakeholder review or discussion of this design: https://github.com/immersive-web/anchors/issues

  - Major unresolved issues with or opposition to this design: No major blockers so far, all issues can be found in the repository (link to issues above).
  - This work is being funded by: N/A.

You should also know that...

N/A.

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

  🐛 open issues in our GitHub repo for **each point of feedback**

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