[w3ctag/design-reviews] env(preferred-text-scale) (Issue #1101)

davidsgrogan created an issue (w3ctag/design-reviews#1101)

こんにちは TAG-さん!

I'm requesting a TAG review of env(preferred-text-scale)

Operating systems and web browsers provide global accessibility settings for the user to increase their system text scale. Authors would like to respect the user’s text scale settings but have trouble doing so today. We propose to provide authors with access to the user’s system font scale factor by adding a new CSS environment variable -- `env(preferred-text-scale)`.

  - Explainer¹: https://davidsgrogan.github.io/env-explainer.html
  - Specification: https://drafts.csswg.org/css-env-1/#text-zoom
  - WPT Tests: Only internal tests due to lack of support for OS font scale setting in WPT. see https://github.com/web-platform-tests/wpt/issues/12725
  - User research:
  - Security and Privacy self-review²: No security issues. Fingerprinting issues have been raised (exposing user preferences) and mitigated (bucketing). It's worth noting that drive-by sites already have access to this information, just non-ergonomically. See https://davidsgrogan.github.io/env-explainer.html#h.8bgh57iyzpo5 for a description of how google.com currently derives this preference.
  - GitHub repo:
  - Primary contacts:
      - @davidsgrogan Blink implementer and CSSWG member championing this proposal
      - @tabatkins Spec editor
      - @JoshTumath BBC author and CSSWG member who initiated the proposal and co-wrote the explainer
  - Organization/project driving the specification:
  - This work is being funded by:
  - Primary standards group developing this feature: CSSWG
  - Incubation and standards groups that have discussed the design:
    - https://github.com/w3c/csswg-drafts/issues/10674
  - Multi-stakeholder support³:
    - Chromium comments: Positive
    - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1229
    - WebKit comments: https://github.com/WebKit/standards-positions/issues/499
    - An author initiated this proposal in the WG. https://davidsgrogan.github.io/env-explainer.html#h.ggc9hbja4vu6 has links to authors asking for help getting this information, and descriptions of the lengths authors currently go to to get this information.
  - Major unresolved issues with or opposition to this specification:
  - Status/issue trackers for implementations⁴: https://chromestatus.com/feature/5328467685801984

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:

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