On Tue, Nov 11, 2025 at 5:34 PM Camille Lamy <[email protected]> wrote:

> No unfortunately we did not do it at the time. Now it's clear we really
> need to do it.
>
> On Wed, Oct 22, 2025 at 10:13 PM Mike Taylor <[email protected]>
> wrote:
>
>> 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 <http:///features#tags:SharedArrayBuffer>, SAB
>> <http:///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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>> .
>>
>>

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