On 10/21/25 11:52 a.m., Chromestatus wrote:
*Contact emails*
[email protected], [email protected]
*Explainer*
/No information provided/
*Specification*
https://tc39.github.io/ecma262/#sec-sharedarraybuffer-objects
*Design docs*
/No information provided/
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer
*Summary*
Adds the JavaScript type SharedArrayBuffer gated behind COOP/COEP. The
concept of a SharedArrayBuffer is that a message to a worker, is
posted but instead of copying the content of the array just a
reference to it is shared. The Atomic API provides atomic loads and
stores and Read/Modify/Write accesses to SharedArrayBuffers. The
Atomic.wait provides the ability for a worker to wait for another
worker to signal it, without having to spinlock.
*Blink component*
Blink>JavaScript
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EJavaScript%22>
*Web Feature ID*
/No information provided/
*Search tags*
SharedArrayBuffer </features#tags:SharedArrayBuffer>, SAB
</features#tags:SAB>
*TAG review*
https://github.com/w3ctag/design-reviews/issues/471
*TAG review status*
Pending
*Origin Trial Name*
SharedArrayBuffers in non-isolated pages on Desktop platforms
*Chromium Trial Name*
UnrestrictedSharedArrayBuffer
*Link to origin trial feedback summary*
https://bugs.chromium.org/p/chromium/issues/entry?components=Internals%3ESandbox%3ESiteIsolation
*Origin Trial documentation link*
https://developer.chrome.com/blog/enabling-shared-array-buffer/
*Risks*
*Interoperability and Compatibility*
/No information provided/
/Gecko/:
Shipped/Shipping (https://bugzilla.mozilla.org/show_bug.cgi?id=1312446)
/WebKit/:
Shipped/Shipping (https://developer.apple.com/library/content/releasenotes/General/WhatsNewInSafari/Articles/Safari_10_1.html)
/Web developers/: Positive
/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?
/No information provided/
*Goals for experimentation*
/No information provided/
*Reason this experiment is being extended*
This is a deprecation trial, and we're giving more time to websites to
stop using the deprecated behavior.
*Reason this experiment is being extended*
The release of DocumentIsolationPolicy in M137 is helping developers
adopt crossOriginIsolation as a way out of this reverse Origin Trial.
However, it will still take time for developers to adopt. We would
like to extend the OT as the final extension and give developers 6
milestones to get out of this reverse Origin Trial. Once this is
approved and developers have requested their token, we will close this
trial so that no further origins adopt the deprecated behavior.
*Reason this experiment is being extended*
We still have one of the historic users of ungated SharedArrayBuffers
which has not managed to transition to cross-origin isolation (Google
Earth). They are in the process of deploying COEP and asked us for an
extension of the reverse origin trial until M146, when they believe
they will be done with COEP deployment. Once the extension is
approved, we'll close the Origin Trial to ensure no new users can
register.
When this was renewed last year
<https://groups.google.com/a/chromium.org/g/blink-dev/c/A4CR6MIVzds/m/CaY6sUSVAAAJ>,
we discussed closing new registrations and only allowing exiting
registrations to renew. Was this ever set up? (if so, it seems to have
regressed, from what I can tell).
*Ongoing technical constraints*
/No information provided/
*Debuggability*
DevTools warning in case SAB is used in none COI context is in place
*Will this feature be supported on all six Blink platforms (Windows,
Mac, Linux, ChromeOS, Android, and Android WebView)?*
No
*Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/web_tests/external/wpt/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/no-coop-coep.https.any.js
https://github.com/tc39/test262/tree/master/test/built-ins/SharedArrayBuffer
https://github.com/tc39/test262/tree/master/test/built-ins/Atomics
*Flag name on about://flags*
/No information provided/
*Finch feature name*
/No information provided/
*Non-finch justification*
/No information provided/
*Requires code in //chrome?*
False
*Tracking bug*
https://bugs.chromium.org/p/chromium/issues/detail?id=709179
*Launch bug*
https://bugs.chromium.org/p/chromium/issues/detail?id=1138860
*Estimated milestones*
Origin trial desktop first 92
Origin trial desktop last 131
Origin trial extension 1 end milestone 109
Origin trial extension 2 end milestone 131
Origin trial extension 3 end milestone 124
Origin trial extension 4 end milestone 136
Origin trial extension 5 end milestone 142
Origin trial extension 6 end milestone 146
DevTrial on desktop 60
DevTrial on Android 88
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/4570991992766464?gate=5932856039833600
*Links to previous Intent discussions*
Intent to Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/1NKvbIj3dq4
Intent to Extend Experiment 1:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAH0ixBN2JhcYtpT4UYKcAfHt1e0Wz_Uxz0CkXcAntguhbmyNCA%40mail.gmail.com
Intent to Extend Experiment 2:
https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/4tDmckQLZLQ
Intent to Extend Experiment 3:
https://groups.google.com/a/chromium.org/g/blink-dev/c/UospzV3lZMk/m/X9K0k8kuAQAJ
Intent to Extend Experiment 4:
https://groups.google.com/a/chromium.org/g/blink-dev/c/A4CR6MIVzds/m/rpsWnzq6AAAJ?e=48417069
Intent to Extend Experiment 5:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/681b67ca.170a0220.4750a.028e.GAE%40google.com
Intent to Ship:
https://groups.google.com/a/chromium.org/g/blink-dev/c/1NKvbIj3dq4
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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