[w3ctag/design-reviews] WG Revision: Creating Always-On-Top Windows (Window Management) (Issue #1302)

steimelchrome created an issue (w3ctag/design-reviews#1302)

### Specification

https://github.com/w3c/window-management/pull/170

### Explainer

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

### Links

- The WG's request for this TAG review: https://github.com/w3c/window-management/issues/10
- TAG review of the previous version of this specification, if any: https://github.com/w3ctag/design-reviews/issues/602 (also https://github.com/w3ctag/design-reviews/issues/767, https://github.com/w3ctag/design-reviews/issues/840, https://github.com/w3ctag/design-reviews/issues/1246)
- A description of what has changed since our previous review: https://github.com/w3c/window-management/pull/170

Feature 1: Creating Always-On-Top Windows
- Previous early design review, if any: N/A
- An introduction to the feature, aimed at unfamiliar audiences: https://github.com/w3c/window-management/blob/main/EXPLAINER_always_on_top.md#1-introduction--abstract
- A description of the problems that end-users were facing before this proposal: https://github.com/w3c/window-management/blob/main/EXPLAINER_always_on_top.md#2-use-cases--user-motivation
- Alternatives considered: https://github.com/w3c/window-management/blob/main/EXPLAINER_always_on_top.md#6-alternatives-considered
- Examples of how to use the proposal to solve the end-users' problems: https://github.com/w3c/window-management/blob/main/EXPLAINER_always_on_top.md#4-feature--permission-detection
- What do the end-users experience with this proposal: https://github.com/w3c/window-management/blob/main/EXPLAINER_always_on_top.md#3-proposed-api
- User research you did to validate the problem and/or design, if any: N/A
- Web Platform Tests: In progress (will be added under https://wpt.fyi/results/window-management)
- Security/Privacy Questionnaire: https://github.com/w3c/window-management/blob/main/security_and_privacy_always_on_top.md (in flight at https://github.com/w3c/window-management/pull/169 / https://github.com/steimelchrome/window-management/blob/explainer-followup-and-security-questionnaire/security_and_privacy_always_on_top.md)

### 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/w3c/window-management
- Primary contacts:
  - Tommy Steimel (@steimelchrome), Google, Author
  - Mike Wasserman (@michaelwasserman), Google, 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:
  - Second Screen WG - https://github.com/w3c/window-management/issues/10, https://github.com/w3c/window-management/pull/163


### Feedback so far

- Active horizontal reviews:
- Multi-stakeholder feedback:
  - Chromium comments: Prototyping behind `chrome://flags/#window-open-always-on-top` (Intent to Prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/1hrQn7ACjhI)
  - Mozilla comments:
    - Creating Always-On-Top Windows - https://github.com/mozilla/standards-positions/issues/1478
    - Window Management (host spec) - https://github.com/mozilla/standards-positions/issues/542
  - WebKit comments:
    - Creating Always-On-Top Windows - https://github.com/WebKit/standards-positions/issues/737
    - Window Management (host spec) - https://github.com/WebKit/standards-positions/issues/117
- Major unresolved issues with or opposition to this specification: None
- Status/issue trackers for implementations:
  - ChromeStatus: https://chromestatus.com/feature/5200904761507840
  - Chromium tracking bug: https://crbug.com/546631275

### You should also know that...

_No response_

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