Thanks for the helpful OT summary doc. LGTM1.

On Monday, July 14, 2025 at 10:47:40 PM UTC-7 Keita Suzuki wrote:

> Contact emailssuzukike...@chromium.org, yyanagis...@chromium.org
>
> Explainer
> https://github.com/WICG/service-worker-static-routing-api/blob/main/resource-timing-api.md
>
> Specificationhttps://github.com/w3c/ServiceWorker
> Other changes:
> https://github.com/w3c/resource-timing/pull/415
> https://github.com/whatwg/fetch/pull/1832
>
> Summary
>
> Adds timing information for ServiceWorker Static routing API, exposed in 
> navigation timing API and resource timing API for developer use. Service 
> Worker provides timing information to mark certain points in time. We add 
> two Static routing API-relevant timing information: RouterEvaluationStart, 
> time to start matching a request with registered router rules, and 
> CacheLookupStart, time to start looking up the cache storage if the source 
> is "cache". In addition, we also add two router source information, the 
> matched router source and the final router source.
>
>
> Blink componentBlink>ServiceWorker 
> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EServiceWorker%22>
>
> TAG reviewhttps://github.com/w3ctag/design-reviews/issues/958
>
> TAG review statusIssues addressed
>
> Origin Trial NameTiming Info for ServiceWorker static routing API
>
> Chromium Trial NameServiceWorkerStaticRouterTimingInfo
>
> Link to origin trial feedback summary
> https://docs.google.com/document/d/19wTiP9sHibJam-XlEV06-jrwSz0M2IKSB-0zqORgYDA/edit?tab=t.0#heading=h.53acks0nurd
>
> Origin Trial documentation link
> https://github.com/WICG/service-worker-static-routing-api/blob/main/resource-timing-api.md
>
> WebFeature UseCounter name
> kV8PerformanceResourceTiming_WorkerRouterEvaluationStart_AttributeGetter
>
> Risks
>
>
> Interoperability and Compatibility
>
> None
>
>
> *Gecko*: No signal (
> https://github.com/mozilla/standards-positions/issues/1031)
>
> *WebKit*: No signal (
> https://github.com/WebKit/standards-positions/issues/354)
>
> *Web developers*: No signals
>
> *Other signals*:
>
> WebView application risks
>
> Does this intent deprecate or change behavior of existing APIs, such that 
> it has potentially high risk for Android WebView-based applications?
>
> Non that I am aware of
>
>
> Debuggability
>
> None
>
>
> Will this feature be supported on all six Blink platforms (Windows, Mac, 
> Linux, ChromeOS, Android, and Android WebView)?Yes
>
> Is this feature fully tested by web-platform-tests 
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
> ?Yes
>
>
> https://wpt.fyi/results/service-workers/service-worker/tentative/static-router/static-router-resource-timing.https.html?label=experimental&label=master&aligned
>
>
> Flag name on about://flagsNone
>
> Finch feature nameServiceWorkerStaticRouterTimingInfo
>
> Rollout planWill ship enabled for all users
>
> Requires code in //chrome?False
>
> Tracking bughttps://crbug.com/41496865
>
> Availability expectationFeature will eventually be available on Web 
> Platform mainline, as it is the part of an already used resource timing 
> API, and the ServiceWorker static routing API is already standardized.
>
> Non-OSS dependencies
>
> Does the feature depend on any code or APIs outside the Chromium open 
> source repository and its open-source dependencies to function?
> n/a
>
> Estimated milestones
> Shipping on desktop 140
> Origin trial desktop first 131
> Origin trial desktop last 136
> Origin trial extension 1 end milestone 139
> Shipping on Android 140
> Origin trial Android first 131
> Origin trial Android last 136
> Origin trial WebView first 131
> Origin trial WebView last 136
>
> Anticipated spec changes
>
> Open questions about a feature may be a source of future web compat or 
> interop issues. Please list open issues (e.g. links to known github issues 
> in the project for the feature specification) whose resolution may 
> introduce web compat/interop risk (e.g., changing to naming or structure of 
> the API in a non-backward-compatible way).
> We are making changes to the following specs: 
> - Service Worker Spec https://github.com/w3c/ServiceWorker/pull/1769 has 
> already been merged 
> - Resource timing spec https://github.com/w3c/resource-timing/pull/415 has 
> been reviewed, and are waiting for merge (waiting for the fetch-spec 
> changes to be reviewed) 
> - Fetch Spec https://github.com/whatwg/fetch/pull/1832 has been reviewed, 
> but are still waiting for editor's review and are also waiting for other 
> vendor's signal.
>
> Link to entry on the Chrome Platform Status
> https://chromestatus.com/feature/6309742380318720?gate=6038764639223808
>
> Links to previous Intent discussionsIntent to Prototype: 
> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFXMW906RJCQXui4UHUWukJwXS8kmHpthQFPRWnTkbhcR8D_XA%40mail.gmail.com
> Intent to Experiment: 
> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFXMW902YSWgaAjhvmJK%2BEwU8DMrW-j8j8MTsr1yKV7di%2Bs3-w%40mail.gmail.com
> Intent to Extend Experiment 1: 
> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFXMW933udcB3e_OHTL-TjcD5G1bFGL88XAsY537h93eCfBPFQ%40mail.gmail.com
>
>
> This intent message was generated by Chrome Platform Status 
> <https://chromestatus.com/>.
>

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