[w3ctag/design-reviews] WG New Spec: Additional Windowing Controls (Issue #1246)

patrykchodur created an issue (w3ctag/design-reviews#1246)

### Specification

https://w3c.github.io/window-management/

### Explainer

https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md

### Links

- The WG's request for this TAG review: https://lists.w3.org/Archives/Public/public-secondscreen/2026Jul/0001.html
- An introduction to the feature, aimed at unfamiliar audiences: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#introduction
- A description of the problems that end-users were facing before this proposal: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#problem-and-use-cases
- Alternatives considered: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#alternatives-considered
- Examples of how to use the proposal to solve the end-users' problems: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#proposal
- What do the end-users experience with this proposal: https://github.com/w3c/window-management/blob/main/EXPLAINER_additional_windowing_controls.md#proposal
- Web Platform Tests:
  - https://wpt.fyi/results/css/mediaqueries/display-state.tentative.html?label=master&label=experimental&aligned
  - https://wpt.fyi/results/css/mediaqueries/resizable.tentative.html?label=master&label=experimental&aligned
  - https://wpt.fyi/results/window-management/additional-windowing-controls.tentative.https.html?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/patrykchodur/window-management
- Primary contacts:
  - Patryk Chodur (@patrykchodur), [Google](https://www.google.com), Editor
  - Mike Wasserman (@michaelwasserman), [Google](https://www.google.com), Editor
- Organization/project driving the specification: Google Chrome team
- This work is being funded by: Google
- Primary standards group developing this feature: Second Screen Working Group
- Incubation and standards groups that have discussed the design:
  - CSS WG - window.onmove event proposal that was removed from the specification - https://github.com/w3c/csswg-drafts/issues/7693#issuecomment-2842594228
  - Second Screen WG - https://github.com/w3c/window-management/issues/158


### Feedback so far

- Active horizontal reviews: 
- Multi-stakeholder feedback:
  - Chromium comments:
  - Mozilla comments: 
  - WebKit comments: 
- Major unresolved issues with or opposition to this specification:
- Status/issue trackers for implementations:
  - https://chromestatus.com/feature/5201832664629248


### You should also know that...

_No response_

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