LGTM
I hope it works.
/Daniel
On 2025-05-07 16:01, Chromestatus wrote:
Contact emails
v...@chromium.org, cl...@chromium.org
Explainer
None
Specification
https://tc39.github.io/ecma262/#sec-sharedarraybuffer-objects
Design docs
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>JavaScript%22>
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
/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?
Goals for experimentation
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.
Ongoing technical constraints
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
Finch feature name
None
Non-finch justification
None
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
DevTrial on desktop 60
DevTrial on Android 88
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/4570991992766464?gate=6222972867837952
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 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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