[w3ctag/design-reviews] WG New Spec: Ignore Duplicate Navigations (Issue #1240)

llannasatoll created an issue (w3ctag/design-reviews#1240)

### Specification

https://github.com/whatwg/html/pull/11765

### Explainer

https://

### Links

- The WG's request for this TAG review: https://github.com/whatwg/html/issues/11743
- Previous early design review, if any: n/a
- An introduction to the feature, aimed at unfamiliar audiences: This feature enhances performance by discarding duplicate navigation requests that occur within a brief (3 second) window, preventing the unnecessary cancellation of ongoing navigations.
- A description of the problems that end-users were facing before this proposal: Accidental duplicate actions, such as rapid double-clicking, currently trigger the cancellation of progressing navigations, resulting in redundant network connection and delays.
- Alternatives considered: Alternatives such as navigation transformation or pipe transfer were rejected due to complexity (see [TPAC 2025 presentation](https://docs.google.com/presentation/d/16pEyrIBy2N1I9wf6aawoBlRaIUDKV7AIPWPD-4YPP5o/edit?usp=sharing)).
- Examples of how to use the proposal to solve the end-users' problems: This is a transparent browser optimization.
- What do the end-users experience with this proposal: Users experience faster and smoother page loads because their initial navigation intent is preserved even if they accidentally click a link multiple times.
- User research you did to validate the problem and/or design, if any: Chrome experimentation showed a decrease in navigations marked as exact duplicates, and a more significant reduction in the number of server responses that were sent but potentially never rendered. This also improves overall latency.
- Web Platform Tests:


### The specification

- [ ] 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/whatwg/html
- Primary contacts:
  - Anna Sato (@llannasatoll), Google
  - Rakina Zata Amni (@rakina), Google, $role in developing specification
- Organization/project driving the specification: Google Chrome team
- This work is being funded by: Google
- Primary standards group developing this feature: WHATWG
- Incubation and standards groups that have discussed the design:
  - W3C / WHATWG "WHATUP" (TPAC 2025 session)


### Feedback so far

- Active horizontal reviews: n/a <!-- 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: Supportive
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1307
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/563
  - {{...include feedback/review from developers, implementers, civil society, and others}}
- Major unresolved issues with or opposition to this specification: No stated opposition.
- Status/issue trackers for implementations:
  - [Chrome Status](https://chromestatus.com/feature/5137490012930048)
  - WebKit's Bugzilla (none, yet)
  - Mozilla's (none, yet)


### You should also know that...

_No response_

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