LGTM1

On Mon, Aug 24, 2026 at 1:08 PM Chromestatus <
[email protected]> wrote:

> *Contact emails*
> [email protected], [email protected]
>
> *Explainer*
> *No information provided*
>
> *Specification*
> https://www.iso.org/standard/85066.html
>
> *Summary*
> Adds support for decoding JPEG XL (image/jxl) images in Blink using
> jxl-rs, a memory-safe pure Rust decoder (https://github.com/libjxl/jxl-rs).
> JPEG XL is a modern image format standardized as ISO/IEC 18181 that offers
> progressive decoding for improved perceived loading performance, support
> for wide color gamut, HDR, and high bit depth, and support for animation.
>
> *Blink component*
> Internals>Images>Codecs>JPEG XL
> <https://issues.chromium.org/issues?q=customfield1222907:%22Internals%3EImages%3ECodecs%3EJPEG%20XL%22>
>
> *Web Feature ID*
> jpegxl <https://webstatus.dev/features/jpegxl>
>
> *Motivation*
> (see Summary)
>
> *Initial public proposal*
> *No information provided*
>
> *TAG review*
> https://github.com/w3ctag/design-reviews/issues/633
>
> *TAG review status*
> Issues addressed
>
> *Goals for experimentation*
>
>
> *Risks*
>
>
> *Interoperability and Compatibility*
> No special risks. Note that the C++ and the Rust version are both tested
> against the same conformance test corpus.
>
> *Gecko*: Shipped/Shipping also migrating to rust version
>
> *WebKit*: Shipped/Shipping WebKit currently uses the C++ decoder.
>
> *Web developers*: Strongly 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?
> New feature, no special risk
>
>
> *Debuggability*
> *No information provided*
>
> *Will this feature be supported on all six Blink platforms (Windows, Mac,
> Linux, ChromeOS, Android, and Android WebView)?*
> Yes
>
> *Is this feature fully tested by web-platform-tests
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
> Yes
> https://wpt.fyi/results/jpegxl?label=experimental&label=master&aligned
> There is extensive conformance testing outside of WPT too. WPTs show
> failures because the flag is disabled in wpt runs.
> https://wpt.fyi/results/jpegxl?sha=3d06a34791fc33532baffe64e5c48c450cb1a1b9
> shows a run with the flag enabled, which has two failures. The
> icc-uncommon-profile-reftest.html failure is a small difference visually,
> currently investigating. The cmyk-basic-conversion-reftest.html failure is
> being fixed in
> https://chromium-review.git.corp.google.com/c/chromium/src/+/8275513
>
> *Flag name on about://flags*
> enable-jxl-image-format
>
> *Finch feature name*
> JXLImageFormat
>
> *Rollout plan*
> Will ship enabled for all users
>
> *Requires code in //chrome?*
> False
>
> *Availability expectation*
> Feature is available on Web Platform Baseline within 12 months of launch
> in Chrome.
>
> *Adoption expectation*
> Feature is considered a best practice for some use case within 12 months
> of reaching Web Platform baseline.
>
> *Adoption plan*
> Multiple players on the web have expressed interest in deploying JPEG XL
> images, including at least Cloudinary and Shopify, as well as multiple web
> developers during the Interop process.
>
> *Non-OSS dependencies*
>
> Does the feature depend on any code or APIs outside the Chromium open
> source repository and its open-source dependencies to function?
> No.
>
> *Estimated milestones*
>
> No milestones specified
>
>
> *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).
> N/A
>
> *Link to entry on the Chrome Platform Status*
> https://chromestatus.com/feature/5114042131808256?gate=6594362739916800
>
> This intent message was generated by Chrome Platform Status
> <https://chromestatus.com>.
>
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> .
>

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