Thank you! LGTM to experiment an additional 3 milestones from M145 to
M147 inclusive.
On 1/8/26 9:30 p.m., Yoshisato Yanagisawa wrote:
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/>.
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