Add prefetchCache and prerenderCache to Clear-Site-Data header

[srwei]

こんにちは TAG-さん!

I'm requesting a TAG review of the feature for adding prefetchCache and prerenderCache values to Clear-Site-Data header.

We propose adding two new values to the Clear-Site-Data header to help developers target clearing the prerender and prefetch cache: prefetchCache and prerenderCache.

• Explainer¹: https://github.com/WICG/nav-speculation/blob/main/clear-site-data-integration.md
• Specification: https://wicg.github.io/nav-speculation/
• WPT Tests: Specify Clear-Site-Data interaction for prerender and prefetch. web-platform-tests/wpt#52223
• User research: none
• Security and Privacy self-review²: https://github.com/WICG/nav-speculation/blob/main/clear-site-data-integration.md#w3c-tag-security-and-privacy-questionnaire-answers
• GitHub repo:
• Primary contacts:
• Organization/project driving the specification: Chromium
• This work is being funded by: Microsoft
• Primary standards group developing this feature: WICG
• Group intended to standardize this work: WHATWG Upstreaming speculation rules and prefetch to HTML whatwg/html#11123 https://w3c.github.io/webappsec-clear-site-data/
• Incubation and standards groups that have discussed the design: Specify clear-site-data integration, and special keywords for prefetch and prerender WICG/nav-speculation#357
• Multi-stakeholder support³:
  • Chromium comments: https://chromium-review.googlesource.com/c/chromium/src/+/6456388?tab=comments
  • Mozilla comments: Add prefetchCache and prerenderCache to Clear-Site-Data header mozilla/standards-positions#1214
  • WebKit comments: Add prefetchCache and prerenderCache to Clear-Site-Data header WebKit/standards-positions#488
• Major unresolved issues with or opposition to this specification: None
• Status/issue trackers for implementations⁴: https://chromestatus.com/feature/4755745652080640

Further details:

• I have reviewed the TAG's Web Platform Design Principles
• Previous early design review, if any: https://github.com/w3ctag/design-reviews/issues/####
• Relevant time constraints or deadlines: