This one seems a bit trickier than RWS itself because we have to reason about the risk of code that assumes the API exists. I am supportive of deprecation now, but perhaps we should come back to the data after RWS is removed and see what the usage severity of breakage is in practice before approving removal?
Rick On Fri, Nov 7, 2025, 12:35 p.m. 'Johann Hofmann' via blink-dev < [email protected]> wrote: > Apologies, I used the wrong Chromestatus link (the original feature > status), this one is correct: > https://chromestatus.com/feature/5162221567082496 > > On Fri, Nov 7, 2025 at 2:44 PM Johann Hofmann <[email protected]> > wrote: > >> Contact emails >> >> [email protected], [email protected] >> >> Explainer >> >> https://github.com/privacycg/requestStorageAccessFor >> >> Specification >> >> https://privacycg.github.io/requestStorageAccessFor/ >> >> Summary >> >> The requestStorageAccessFor (rSAFor) API is an extension to the Storage >> Access API that allows a top-level site to request access to unpartitioned >> ("first-party") cookies on behalf of embedded sites. Browsers will have >> discretion to grant or deny access, with mechanisms like Related Website >> Sets (RWS) membership as a potential signal. This allows for use of the >> Storage Access API by top-level sites. Following Chrome's announcement that >> the current approach to third-party cookies will be maintained, we are now >> planning to deprecate and remove rSAFor, as it is only usable in Chrome to >> request storage access between RWS sites. Related Website Sets will also be >> deprecated via a separate intent. >> >> Blink component >> >> Blink>StorageAccessAPI >> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EStorageAccessAPI> >> >> Web Feature ID >> >> None >> >> Motivation >> >> Chrome has announced >> <https://privacysandbox.com/news/update-on-plans-for-privacy-sandbox-technologies/> >> that the current approach to third-party cookies will be maintained. rSAFor >> currently has usage on about 0.95% of page loads >> <https://chromestatus.com/metrics/feature/timeline/popularity/4332>, but >> any website relying on successful invocation of rSAFor (i.e. the API >> returns a promise that resolves) must also have registered a set on the RWS >> GitHub >> repository >> <https://github.com/GoogleChrome/related-website-sets/blob/main/related_website_sets.JSON>. >> Any invocations of rSAFor outside of an RWS currently returns a promise >> that is rejected. >> >> Our metrics suggest that almost all of the usage of rSAFor is from >> websites that have registered sets. We will continue to monitor usage and >> aim to drive it down prior to removal by proactively informing set owners >> of the deprecation timelines and request them to turn down usage. >> Additionally, other browser engines have not signaled interest in >> implementing the API, obviating any interoperability concerns. >> >> Debuggability >> >> N/A >> >> Requires code in //chrome? >> >> False >> >> Estimated milestones >> >> Deprecate in M144, and target M150 for removal. >> >> Link to entry on the Chrome Platform Status >> >> https://chromestatus.com/feature/5122534152863744 >> >> This intent message was generated by Chrome Platform Status >> <https://chromestatus.com/>. >> >> -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAD_OO4jr7zaQS-Sy%2B_DvWQsMWx_DMJ_sLsMe412Ca96Cg-uLyg%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAD_OO4jr7zaQS-Sy%2B_DvWQsMWx_DMJ_sLsMe412Ca96Cg-uLyg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFUtAY_ehD4CA8vrRJ2hSGN%2BGO6%2B%2BOMjCXWiFUqxgsuaVQMHhg%40mail.gmail.com.
