Let me also write a reply here. Since nobody uses SharedWorker on Android now, I thought we can know the OT number by filtering with a platform. However, I am not sure how feasible it is.
In case it is not feasible, I have also written a change list to add a dedicated use counter for SharedWorkerOnAndroid. https://chromium-review.googlesource.com/c/chromium/src/+/6818096 I am open to going either way. 1. add a new dedicated counter. 2. higher alert limit (maybe current average value + the OT limit) 3. filter by platform. 4. anything else. Thank you, Yoshisato. 2025年8月1日(金) 2:58 Jason Robbins <jrobb...@google.com>: > This OT has not started yet, but it is already triggering alerts to the > interop-tooling team about high usage, probably because its usecounter is > counting usage on platforms that already support this feature. > https://chromestatus.com/metrics/feature/timeline/popularity/5 > > That chart goes up to 1.6%, which is more than the 0.5% ratio at which a > limit is nominally supposed to be enforced, according to > https://g3doc.corp.google.com/chrome/origin_trials/g3doc/trial_usage_monitoring.md#investigating-alerts > . > > Should we set a higher alert limit for this OT and have it continue to use > the existing usecounter? > Or, should the feature owner define a new usecounter to count new usage > separately from existing usage? > Or, something else? > > Thanks, > jason! > > > > On Friday, July 18, 2025 at 8:52:12 AM UTC-7 mike...@chromium.org wrote: > >> LGTM >> On 7/17/25 11:27 p.m., 'Yoshisato Yanagisawa' via blink-dev wrote: >> >> Not sure why the Experiment Goals became empty, but let me copy contents >> from chromestatus. >> >> 2025年7月18日(金) 12:25 Chromestatus <ad...@cr-status.appspotmail.com>: >> >>> Contact emails yyana...@google.com, dom...@chromium.org >>> >>> Explainer None >>> >>> Specification >>> https://html.spec.whatwg.org/multipage/workers.html#shared-workers-and-the-sharedworker-interface >>> >>> Summary >>> >>> For a long time, SharedWorker has been disabled on Android due to >>> concerns about its unpredictable process lifecycle. We believed that >>> SharedWorker instances might terminate unexpectedly, without noticing to >>> users or web developers, which we considered unacceptable. However, a >>> recent discussion on GitHub (https://github.com/whatwg/html/issues/11205) >>> suggests that the unpredictable nature of SharedWorker's process lifecycle >>> might not be as significant an issue as we once thought. Based on this, we >>> plan to re-enable SharedWorker on Android while simultaneously >>> investigating this behavior to ensure a stable and reliable experience. >>> >>> >>> Blink component Blink>Workers >>> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EWorkers%22> >>> >>> TAG review None >>> >>> TAG review status Not applicable >>> >>> Risks >>> >>> >>> Interoperability and Compatibility >>> >>> While Chrome has been the sole major browser not to offer SharedWorker, >>> this change aims to close that gap. However, unlike on desktop, Android's >>> unpredictable process lifecycle presents a unique risk. SharedWorker >>> instances might terminate unexpectedly, for example, when a Chrome app is >>> moved to the background and then foregrounded. This inherent uncertainty in >>> the Android environment is a key risk when running SharedWorker. >>> >>> >>> *Gecko*: Shipped/Shipping >>> >>> *WebKit*: Shipped/Shipping >>> >>> *Web developers*: Positive As you can see in http://crbug.com/40290702, >>> SharedWorker support on Android has been a long-awaited feature by web >>> developers. This demonstrates a clear and sustained demand from the >>> developer community for this capability. >>> >>> *Other signals*: >>> >>> Ergonomics >>> >>> n/a >>> >>> >>> Activation >>> >>> n/a >>> >>> >>> Security >>> >>> This feature is already shipped on desktop, and no new security risks >>> are introduced with the Android implementation. >>> >>> >>> 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? >>> >>> None >>> >>> >>> Goals for experimentation >> >> >> Experiment Goals The goal is to evaluate the real-world impact of >> Android's process lifecycle on SharedWorker stability. Unlike on desktop, >> SharedWorker instances on Android can be terminated unexpectedly by the >> operating system due to memory pressure. This trial allows us to release >> the feature to developers who understand this risk and can provide crucial >> feedback. Specifically, we aim to measure: 1. The frequency of unexpected >> SharedWorker terminations in real-world scenarios. 2. Whether the current >> API is sufficient for developers to handle such terminations gracefully. 3. >> The necessity of potential spec-level countermeasures, as discussed in >> https://github.com/whatwg/html/issues/11205, to bridge this behavioral >> gap between mobile and desktop platforms and ensure a consistent developer >> experience. The insights from this experiment will be critical in >> determining the path to shipping SharedWorker on Android, informing whether >> it can be enabled by default or if further mitigation work is required. >> Experiment >> Risks The risk for sites participating in this experiment is functional >> breakage upon the trial's conclusion. When the trial period ends, the >> SharedWorker API will be disabled on Chrome for Android, pending the >> results of the experiment. Consequently, any site that has integrated >> SharedWorker-based logic for its Android users will experience failures, as >> the SharedWorker constructor will no longer be available. >> >>> >>> Ongoing technical constraints >>> >>> None. >>> >>> >>> Debuggability >>> >>> This feature is already shipped on desktop, and no new debuggability >>> issues should be introduced with the Android implementation. >>> >>> >>> Will this feature be supported on all six Blink platforms (Windows, Mac, >>> Linux, ChromeOS, Android, and Android WebView)? No >>> >>> This aims to make SharedWorker supported on Android and Android WebView. >>> SharedWorker has been supported other than them. >>> >>> >>> Is this feature fully tested by web-platform-tests >>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> >>> ? Yes >>> >>> SharedWorker tests under https://wpt.fyi/results/workers. e.g. >>> https://wpt.fyi/results/workers/SharedWorker-simple.html Note that >>> since wpt.fyi runs tests on Linux not Android for Chromium. >>> >>> >>> DevTrial instructions >>> https://developer.mozilla.org/en-US/docs/Web/API/SharedWorker/SharedWorker >>> >>> Flag name on about://flags None >>> >>> Finch feature name SharedWorker >>> >>> Requires code in //chrome? False >>> >>> Tracking bug https://crbug.com/40290702 >>> >>> Measurement SharedWorkerStart filtered by Android. >>> >>> Estimated milestones >>> Origin trial Android first 140 >>> Origin trial Android last 144 >>> DevTrial on Android 140 >>> >>> Link to entry on the Chrome Platform Status >>> https://chromestatus.com/feature/6265472244514816?gate=5096285778214912 >>> >>> 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 blink-dev+...@chromium.org. >> To view this discussion visit >> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAPNB-6V3xrSzQwRgTAUM_tAX5AasCdEyAbhaAHVTKc9m%2BagnGg%40mail.gmail.com >> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAPNB-6V3xrSzQwRgTAUM_tAX5AasCdEyAbhaAHVTKc9m%2BagnGg%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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