[w3ctag/design-reviews] Extending the PointerEvent with Unique DeviceId Attribute (Issue #880)

こんにちは TAG-さん!

I'm requesting a TAG review of PointerEvent.deviceId.

As devices with advanced pen input capabilities are becoming increasingly prevalent, it is important that the web platform continues to evolve to fully support these advanced features in order to unlock rich experiences for both end users and developers. One such advancement is the ability for a device's digitizer to recognize more than one pen device interacting with it simultaneously. In this Explainer, we propose an extension to the PointerEvent interface to include a new attribute, deviceId, that represents a session-persistent, document isolated, unique identifier that a developer can reliably use to identify individual pens interacting with the page.

  - Explainer¹ (minimally containing user needs and example code): [[url](https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/PointerEventDeviceId/explainer.md)]
  - Specification URL: Please see the explainer. The WICG propasal is here: https://github.com/WICG/proposals/issues/101
  - Security and Privacy self-review²: Please consider the privacy and security sections of the explainer and the questionnaire which is filled out and posted as a comment to this review.
  - Primary contacts (and their relationship to the specification):
      - [Sahir Vellani] ([sahirv]), [Microsoft]
      - [Ben Mathwig] ([bmathwig]), [Microsoft]
      - [Olga Gerchikov] ([ogerchikov]), [Microsoft]
  - Organization(s)/project(s) driving the specification: Microsoft/Chromium
  - Key pieces of existing multi-stakeholder review or discussion of this specification:  
      - https://groups.google.com/a/chromium.org/g/blink-dev/c/_s7rj-CuMF8/m/W9czG_8nCQAJ
      - https://chromium-review.googlesource.com/c/chromium/src/+/4298332/comment/058d1bff_169a1f13/ 
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5114132234240000

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: Dec 2023
  - The group where the work on this specification is currently being done: Web Incubation Community Group (WICG)
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): PointerEvent Working Group
  - Major unresolved issues with or opposition to this specification: No opposition or issues
  - This work is being funded by: Microsoft


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 [github usernames]

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