Thank you for the question. Here is what we've learned from the first four milestones:
Looking at the UMA data, we have observed instances of the feared "Worker connection lost" events, confirming the process lifecycle concerns are valid, albeit the occurrences are extremely rare. Based on this limited sample, it does not appear to be the majority reason for SharedWorker termination. However, we do not yet have the statistical volume of data to draw firm conclusions or have a more in-depth discussion on the statistics. On the positive side, we’ve had over 10 Origin Trial sign-ups since October, and we've seen a few more this month, potentially due to the efforts referenced in the GitHub issue ( https://github.com/web-platform-tests/interop/issues/1064 <https://www.google.com/url?source=gmail&sa=E&q=https://github.com/web-platform-tests/interop/issues/1064>). We will continue to closely monitor the results. Best regards, Yoshisato 2026年1月8日(木) 23:41 Mike Taylor <[email protected]>: > Typically we ask folks to answer a few questions > <https://www.chromium.org/blink/launching-features/#:~:text=will%20not%20be%20approved%20unless%20substantial%20progress%20is%20demonstrated%20in%20all%20of%20these%20areas> > about progress before approving OT extensions. But this experiment is > different enough that they don't make a lot of sense IMHO. That said, is > there anything you can share from what you have learned from the first 4 > milestones the experiment has been available? > On 1/7/26 10:42 p.m., Yoshisato Yanagisawa wrote: > > *Contact emails* > [email protected], [email protected] > > *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> > > *Web Feature ID* > shared-workers <https://webstatus.dev/features/shared-workers> > > *TAG review* > *No information provided* > > *TAG review status* > Not applicable > > *Origin Trial Name* > SharedWorker on Android > > *Chromium Trial Name* > SharedWorkerOnAndroid > > *Origin Trial documentation link* > https://developer.mozilla.org/en-US/docs/Web/API/SharedWorker > > *WebFeature UseCounter name* > kSharedWorkerStartOnAndroid > > *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? > *No information provided* > > > *Goals for experimentation* > *No information provided* > > *Reason this experiment is being extended* > A major partner is about to start a large-scale experiment. We believe > that extending the trial to cover their experiment window is crucial, as it > will provide us with essential performance metrics and stability data at > scale. This extension will prevent any service disruption for the partner > and ensure we have sufficient evidence to support the final launch. > > *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* > *No information provided* > > *Finch feature name* > SharedWorker > > *Requires code in //chrome?* > False > > *Tracking bug* > https://crbug.com/40290702 > > *Measurement* > SharedWorkerStart filtered by Android. > > *Estimated milestones* > Origin trial desktop first 140 > Origin trial desktop last 144 > Origin trial extension 1 end milestone 147 > 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=4824380645441536 > > *Links to previous Intent discussions* > Intent to Experiment: > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6879be98.2b0a0220.72055.015d.GAE%40google.com > > > 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/CAPNB-6VPRn%2BLp%2B61oJOc2e3fnY3F1LaZ2f2g_LTsA%3DXv49FzgQ%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAPNB-6VPRn%2BLp%2B61oJOc2e3fnY3F1LaZ2f2g_LTsA%3DXv49FzgQ%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/CAPNB-6WWeE%3DftgY0ESDtedA%3DEveVWYSjcMETQ6SwPfMdzLNomA%40mail.gmail.com.
