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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