LGTM1
On 10/27/25 5:39 p.m., Chromestatus wrote:
*Contact emails*
[email protected]
*Explainer*
https://github.com/gpuweb/gpuweb/issues/4973
*Specification*
https://www.w3.org/TR/WGSL/#language_extension-uniform_buffer_standard_layout
*Summary*
Functionality added to the WebGPU spec after its first shipment in a
browser. Uniform buffers declared in WGSL shaders are no longer
required to have 16-byte alignment on array elements, or to pad nested
structure offsets to a multiple of 16 bytes.
*Blink component*
Blink>WebGPU
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EWebGPU%22>
*Web Feature ID*
webgpu <https://webstatus.dev/features/webgpu>
*Motivation*
This feature simplifies the use of uniform buffers in WGSL shaders by
unifying their constraints with those of storage buffers. Without
this, developers are required to align all array elements to 16 bytes
and pad nested structures to achieve a 16-byte offset.
*Initial public proposal*
https://github.com/gpuweb/gpuweb/pull/5347
*TAG review*
/No information provided/
*TAG review status*
Pending
*Risks*
*Interoperability and Compatibility*
This feature has been approved in W3C GPU for the Web WG meetings
including participants from Safari and Firefox. Minutes from W3C
meeting where the decision to accept the proposal was finalized:
https://github.com/gpuweb/gpuweb/wiki/GPU-Web-2025%E2%80%9010%E2%80%9021-WGSL#language-feature-for-relaxing-uniform-address-space-layout-5347
/Gecko/: No
signal (https://github.com/mozilla/standards-positions/issues/1205#issuecomment-3312534193)
/WebKit/: Closed Without a
Position (https://github.com/WebKit/standards-positions/issues/294#issuecomment-1877411933)
/Web developers/: No signals
/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?
None
*Debuggability*
None
*Will this feature be supported on all six Blink platforms (Windows,
Mac, Linux, ChromeOS, Android, and Android WebView)?*
Yes
All platforms will eventually have support. Will immediately be
available on Android, Android WebView, ChromeOS, Mac, and Windows,
since those platforms already support WebGPU. Linux is planned to have
WebGPU support in the future, so this feature will become available
when WebGPU does.
*Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
WebGPU/WGSL have a conformance test suite
(https://github.com/gpuweb/cts) that is regularly pulled into Chromium
and part of the testing of Dawn/Tint in Chromium. While the CTS can be
embedded in WPT, the WebGPU team opted to keep it separate in Chromium
testing to use a customized harness for robustness and performance.
CTS coverage for this feature was added here:
https://github.com/gpuweb/cts/pull/4484
*Flag name on about://flags*
Enable Unsafe WebGPU
*Finch feature name*
UnsafeWGSLFeatures
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://crbug.com/452662924
*Estimated milestones*
Shipping on desktop 144
DevTrial on desktop 143
Shipping on Android 144
DevTrial on Android 143
Shipping on WebView 144
*Anticipated spec changes*
Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github
issues in the project for the feature specification) whose resolution
may introduce web compat/interop risk (e.g., changing to naming or
structure of the API in a non-backward-compatible way).
/No information provided/
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/6680245553987584?gate=6542931179732992
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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