LGTM3
On 8/24/26 9:57 a.m., Vladimir Levin wrote:
LGTM2. Similar to Yoav, I'm very excited for this feature
On Mon, Aug 24, 2026, 09:12 Yoav Weiss (@Shopify)
<[email protected]> wrote:
I guess I can expand a bit more.. :)
This is an exciting addition to the web platform, that will enable
improved image compression at reduced CPU costs on the encoding
side. Thanks for pushing this through!!
On Mon, Aug 24, 2026 at 2:15 PM Yoav Weiss (@Shopify)
<[email protected]> wrote:
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
<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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