[w3ctag/design-reviews] WG New Spec: Web Sustainability Guidelines (Issue #1181)

hidde created an issue (w3ctag/design-reviews#1181)

### Specification

https://www.w3.org/TR/web-sustainability-guidelines/

### Explainer

https://github.com/w3c/sustainableweb-wsg/blob/main/explainer.md

### Links

- The WG's request for this TAG review: Got group consensus in meeting of 11 December 2025 (minutes: https://docs.google.com/document/d/1mDp2Ao_FaurV4GCVkoYFz2NtgYhmeRAjYLKvqMAIEbk/edit?tab=t.0)  <!-- If the WG didn't express consensus to ask the TAG for a review, use the "Other Specification Review" template instead, at https://github.com/w3ctag/design-reviews/issues/new?template=015-other-spec-review.yaml. This is usually a deep link into minutes or an email thread. -->
- Previous early design review, if any: n/a
- An introduction to the feature, aimed at unfamiliar audiences: https://w3c.github.io/sustainableweb-wsg/glance.html   <!-- Can be the specification's or explainer's introduction, or another section. -->
- A description of the problems that end-users were facing before this proposal: https://www.w3.org/TR/web-sustainability-guidelines/#background-on-wsg   <!-- See https://w3ctag.github.io/explainer-explainer/#end-user-need -->
- Alternatives considered: n/a https://  <!-- See https://w3ctag.github.io/explainer-explainer/#alternatives -->
- Examples of how to use the proposal to solve the end-users' problems: https://  <!-- See https://w3ctag.github.io/explainer-explainer/#describe-proposal -->
- What do the end-users experience with this proposal: n/a  <!-- See https://w3ctag.github.io/explainer-explainer/#describe-proposal -->
- User research you did to validate the problem and/or design, if any: no specific user research, but globally, there is a wide range of laws and policies around digital sustainability. We list them here: https://w3c.github.io/sustainableweb-wsg/policies.html 
- Web Platform Tests:  there are no Web Platform Test, we do consider testability in our [section on measurability](https://www.w3.org/TR/web-sustainability-guidelines/#measurability). <!-- Or other tests if this is not a web platform feature. -->


### The specification

- [ ] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [ ] 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/sustainableweb-wsg/ 
- Primary contacts:
  - Alexander Dawson (@AlexDawsonUK), Invited Expert, lead editor
  - Rose Newell (@codewordcreative), Invited Expert, editor
  - Ines Akrap (@ines-akrap), Invited Expert, co-chair
  - Tim Frick (@timfrick), Invited Expert, co-chair
  - Mike Gifford (@mgifford), Invited Expert, co-chair
  -  Tzviya Siegman (@TzviyaSiegman), W3C, staff contact 
- Organization/project driving the specification: n/a
- This work is being funded by: n/a
- Primary standards group developing this feature: Web Sustainability Interest Group
- Incubation and standards groups that have discussed the design:
  - Web Performance WG (incl joint meeting at this year's TPAC)
  - [Sustainable Web Design Community Group](https://www.w3.org/community/sustyweb/) (closed now)

### Feedback so far

- Active horizontal reviews: 
  - Privacy/Security: https://github.com/w3c/sustainableweb-wsg/issues/162 
  - Accessibility: https://github.com/w3c/sustainableweb-wsg/issues/157 
  - Internationalization: https://github.com/w3c/sustainableweb-wsg/issues/148   <!-- Link to an issue like https://github.com/webmachinelearning/webnn/issues/239, https://github.com/WebAssembly/spec/issues/1804, or https://github.com/w3c/did/issues/885, which itself links to the other horizontal reviews. If you haven't started the rest of the horizontal reviews, please consider doing so. -->
- Multi-stakeholder feedback:
  - Chromium comments: n/a (not a browser feature)
  - Mozilla comments: n/a (not a browser feature) <!-- And/or other places they've given feedback -->
  - WebKit comments: n/a (not a browser feature) <!-- And/or other places they've given feedback -->
  - Informally we have had feedback from Green Software Foundation, Green Web Foundation, B Labs, ARCEP (Autorité de Régulation des Communications Électroniques, des Postes et de la Distribution de la Presse).
- Major unresolved issues with or opposition to this specification: none at the moment
- Status/issue trackers for implementations: n/a (not a browser feature) <!-- Include links to [Chrome Status](https://chromestatus.com/), [Mozilla's](https://bugzilla.mozilla.org/), [WebKit's Bugzilla](https://bugs.webkit.org/), and trackers for other implementations if those are known to you. -->


### You should also know that...

We are looking for feedback by February, we aim to publish in April.

Other comments that may be relevant: 

- Metrics are a work in progress and will be added in. https://github.com/w3c/sustainableweb-ig/issues/178 
- We are working on a conformance model, this could still shift a few things.
- We’re not adding a metric for carbon intensity, we’ll use [SCI-Web from the Green Software Foundation](https://github.com/w3c/sustainableweb-wsg/pull/199). Related, we have a MOU relationship with Green Software Foundation (ask @TzviyaSiegman for questions).

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