[w3ctag/design-reviews] Expose unprintable areas via CSS (Issue #1115)

mstensho created an issue (w3ctag/design-reviews#1115)

I'm requesting an early TAG design review of exposing unprintable areas via CSS.

Most printers have a small region along each edge of the page sheet which is unprintable, due to the printer's paper handling mechanism. See https://drafts.csswg.org/css-page-3/#page-terms

The size of these unprintable areas are available to applications (such as browsers) in most OSes, but currently it's not web-exposed. This means that authors have no means of confidently setting page margins to prevent content from getting clipped. This becomes a more obvious shortcoming for `@page` margin boxes for e.g. custom headers and footers. See https://drafts.csswg.org/css-page-3/#margin-boxes

  - Explainer: https://github.com/mstensho/unprintable-areas
  - Security and Privacy self-review: https://github.com/mstensho/unprintable-areas?tab=readme-ov-file#are-there-any-privacy-security-and-accessibility-considerations
  - GitHub repo: https://github.com/w3c/csswg-drafts
  - Primary contacts:
      - Morten Stenshorne (@mstensho), Google, spec proposal and implementation
      - Tab Atkins-Bittner (@tabatkins), Google, editor of css-env
  - Organization/project driving the design: Google
  - Incubation and standards groups that have discussed the design: https://github.com/w3c/csswg-drafts/issues/11395
  - Standards group(s) that you expect to discuss and/or adopt this work when it's
    ready: CSSWG
  - Multi-stakeholder feedback:
    - Mozilla comments: https://github.com/mozilla/standards-positions/issues/NNN <!-- And/or other places they've given feedback -->
    - WebKit comments: https://github.com/WebKit/standards-positions/issues/NNN <!-- And/or other places they've given feedback -->
 
  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)

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