[w3ctag/design-reviews] Other Spec Review: Responsively-sized iframes (Issue #1223)

kojiishi created an issue (w3ctag/design-reviews#1223)

### Specification

https://drafts.csswg.org/css-sizing-4/#responsive-iframes

### Explainer

https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/responsive-iframes-explainer.md

### Links

- Previous early design review, if any: none
- An introduction to the feature, aimed at unfamiliar audiences: https://drafts.csswg.org/css-sizing-4/#responsive-iframes
- A description of the problems that end-users were facing before this proposal: https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/responsive-iframes-explainer.md#problem-description
- Alternatives considered: none
- Examples of how to use the proposal to solve the end-users' problems: https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/responsive-iframes-explainer.md#example
- What do the end-users experience with this proposal: https://w3ctag.github.io/explainer-explainer/#describe-proposal
- User research you did to validate the problem and/or design, if any: none
- Web Platform Tests:  https://wpt.fyi/results/css/css-sizing/responsive-iframe?label=experimental&label=master&aligned


### The specification

- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes Security and Privacy Considerations sections based on answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).

### Where and by whom is the work is being done?

- GitHub repo: https://github.com/kojiishi/csswg-drafts
- Primary contacts:
  - @kojiishi, Google, Chromium implementer
  - @bfgeek, Google, Chromium implementer
  - @chrishtr, Google, Chromium implementer
  - @tabatkins, Google, spec editor
  - @atanassov, Microsoft, CSS WG chair
  - @astearns, Adobe, CSS WG chair
- Organization/project driving the specification:
- This work is being funded by:
- Primary standards group developing this feature: CSS WG
- Group intended to standardize this work: CSS WG
- Incubation and standards groups that have discussed the design:
  - WHATWG https://github.com/whatwg/html/issues/555


### Feedback so far

- Multi-stakeholder feedback:
  - Chromium comments: positive
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1394
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/653
  - https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/responsive-iframes-explainer.md#use-cases
- Major unresolved issues with or opposition to this specification: https://github.com/w3c/csswg-drafts/issues/13589
- Status/issue trackers for implementations:
  - [Chrome Status](https://chromestatus.com/feature/5108373464547328)


### You should also know that...

_No response_

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