[w3ctag/design-reviews] CSS Overflow Navigation Controls (Issue #1037)

こんにちは TAG-さん!

I'm requesting a TAG review of CSS Overflow Navigation Controls.

Carousels are an often used design pattern on the web. They are used in a variety of contexts, from product listing pages to slideshow like content. OpenUI has [explored a range of carousel designs](https://open-ui.org/components/carousel.research/), showing that the specific layout and appearance can vary dramatically. They are also provided by many frameworks as components, however implementing a carousel correctly is complicated and often results in inconsistent and sometimes inaccessible implementations.

There are a [variety of problems being solved by carousels](https://css.oddbird.net/overflow/explainer/), which we believe could be provided by a set of CSS features. Developers could then combine these CSS features to create the various designs. CSS-only component libraries could be built to further simplify this process.

  - Explainer¹: https://github.com/w3c/csswg-drafts/blob/main/css-overflow-5/carousel-explainer.md
  - Specification: https://drafts.csswg.org/css-overflow-5/#scroll-navigation, https://drafts.csswg.org/css-multicol-2/#selectordef-column, [interactivity: inert](https://github.com/w3c/csswg-drafts/pull/11178)
  - WPT Tests: Need to be moved to wpt
  - User research: https://css.oddbird.net/overflow/explainer/ (Carousel listed among top missing elements https://2023.stateofhtml.com/en-US/usage/#html_missing_elements)
  - Security and Privacy self-review²: This feature has no known privacy/security concerns. https://drafts.csswg.org/css-overflow-5/#privacy https://drafts.csswg.org/css-overflow-5/#security
  - GitHub repo: https://github.com/w3c/csswg-drafts/
  - Primary contacts:
      - Robert Flack (@flackr), Google, editor
      - Tab Atkins (@tabatkins), Google, editor
  - Organization/project driving the specification: Google
  - Multi-stakeholder support³:
    - Chromium comments: Positive, implementation is underway
    - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1161
    - WebKit comments: https://github.com/WebKit/standards-positions/issues/NNN
  - Status/issue trackers for implementations⁴:
    - Chromium: [::scroll-marker and ::scroll-marker-group](https://chromestatus.com/feature/5160035463462912), [::scroll-button(*)](https://chromestatus.com/feature/5093129273999360), [interactivity: inert](https://chromestatus.com/feature/5107436833472512)

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:
  - The group where the work on this specification is currently being done: CSSWG
  - The group where standardization of this work is intended to be done (if different from the current group):
  - Major unresolved issues with or opposition to this specification:
  - This work is being funded by:

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