[w3ctag/design-reviews] [SVG 2.0] Allow `use` to reference an external document's root element by omitting the fragment (Issue #1081)

goldenboy777 created an issue (w3ctag/design-reviews#1081)

こんにちは TAG-さん!

I'm requesting a TAG review of "Allow [use](https://svgwg.org/svg2-draft/struct.html#UseElement) to reference an external document's root element by omitting the fragment".

The `use` element in SVG allows for the reuse of existing SVG elements by referencing them, but currently browsers only support these being id references. We propose that browsers also support the [SVG2](https://svgwg.org/svg2-draft/struct.html#UseElement) capability of allowing a `use` reference to refer to an entire SVG file, without id.

  - Explainer¹: https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/SVG/allow-use-to-reference-entire-files.md
  - Specification: https://svgwg.org/svg2-draft/struct.html#UseElement
  - User research: Developers using external SVGs in their projects have shown interest for this feature.  Please refer to the explainer document for further details about their use cases.
  - Security and Privacy self-review²: Non-applicable ([Resolution](https://www.w3.org/2011/10/28-svg-irc#T00-33-43) for this spec is already achieved and we are raising this TAG review to inform that Chromium is ready to adapt this specification)
  - Primary contacts:
     - Divyansh Mangal (@goldenboy777), Microsoft.

  - Organization/project driving the specification: Microsoft
  - This work is being funded by: Microsoft
  - Primary standards group developing this feature: [W3C SVG Working Group](https://www.w3.org/Graphics/SVG/WG/)
  - Incubation and standards groups that have discussed the design:
    - [W3C SVG Working Group](https://www.w3.org/Graphics/SVG/WG/),  Minutes-link: https://www.w3.org/2011/10/28-svg-irc#T00-33-43
  - Multi-stakeholder support³:
    - Chromium comments: https://issues.chromium.org/issues/40362369
    - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1204
    - WebKit comments: https://github.com/WebKit/standards-positions/issues/480

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Previous early design review, if any: 
  - Relevant time constraints or deadlines: April, 2025

You should also know that...

This specification is already resolved and available in the [SVG2](https://svgwg.org/svg2-draft/struct.html#UseElement). As per Chromium guidelines, since none of the browsers has currently implemented this specification, https://www.chromium.org/blink/launching-features/wide-review/#exceptions, we are raising this TAG issue to review this spec and to announce that Chromium/blink is ready to adapt this as a feature.

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¹ We require an explainer to give the relevant context for the spec review, even if the spec has some background information. An explainer must address user needs and contain examples of use.  For more information, see our [explanation of how to write a good explainer](https://tag.w3.org/explainers/).

² A Security and Privacy questionnaire helps us understand potential security and privacy issues and mitigations for your design, and can save us asking redundant questions. See https://www.w3.org/TR/security-privacy-questionnaire/.

³ For your own organization, you can simply state the organization's position instead of linking to it.  This includes items on [Mozilla standards-positions](https://github.com/mozilla/standards-positions), and [WebKit standards-positions](https://github.com/WebKit/standards-positions).  Chromium doesn't have a standards-positions repository and [prefers](https://source.chromium.org/chromium/chromium/src/+/main:docs/standards/positions/GoogleChrome/README.md) to use comments from the teams that maintain the relevant area of their codebase.

⁴ 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.

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