Hey Alex, I hope these help!

On Tuesday, April 15, 2025 at 3:21:34 AM UTC+9 Alex Russell wrote:

Thanks for filing an extension request.

Some questions that weren't clear from the above:


   - Is this extension going to involve breaking changes? I saw the TAG's 
   feedback from last year had API shape suggestions, so curious to know if 
   it's evolving further in this extension


We made a lot of breaking changes to the API over the course of the 
existing origin trial, actually. That included aligning with the TAG's 
preferred API shape 
<https://github.com/webmachinelearning/translation-api/commit/7a78e206c5da497d58076df0626aab2435342dd0>,
 
changing the capabilities-testing API surface 
<https://github.com/webmachinelearning/translation-api/commit/f2ee475e66aafab1b6739430c2949ceca4af9ae4>,
 
and some more minor ones like censoring download progress 
<https://github.com/webmachinelearning/translation-api/commit/750d2d9f4e32c1c2f1ff25d546ad60d0804364d2>.
 
So if you were concerned about the possibility of lock-in, I think we're 
working hard to avoid it!

For the 137-138 extension request, we plan a couple more, namely restricting 
from cross-origin iframes (but with a permission policy to delegate back), 
and removing worker support 
<https://github.com/webmachinelearning/translation-api/commit/045f0839079ad9a3614516a93d14c8b4d27236e4>.
 
But the main goal is to get feedback on the now-more-stable API shape, 
since things have settled down a bit and developers will be more able to 
build on what we have.
 


   - Has there been developer feedback to date? Are you able to summarize 
   it here?
   

Kenji (cc'ed) may be able to share more, but some of what I can link to 
include generally-positive quantitative feedback 
<https://github.com/webmachinelearning/meetings/blob/main/telcons/2025-02-26-cg-minutes.md#:~:text=Kenji:%20I%20can%20share%20the,and%20share%20what%20we%20can>
 gathered 
via surveys, and a couple devs 
<https://github.com/webmachinelearning/translation-api/issues/36> sharing 
their use cases on the GitHub.
 


   - 
   - Why an extension, not an I2S or sunset?


As mentioned above, we'd like a few more milestones for developers to give 
us feedback on the newly-stable API shape before we ship. We're hoping to 
ship soon, though!
 

Best,

Alex

On Monday, April 14, 2025 at 9:54:02 AM UTC-7 mem...@google.com wrote:

Contact emails

dome...@chromium.org, fer...@chromium.org, kenjibah...@chromium.org, 
a...@chromium.org, memm...@chromium.org, christin...@chromium.org

Explainer

https://github.com/WICG/translation-api/blob/main/README.md

Specification

https://webmachinelearning.github.io/translation-api

Summary

A JavaScript API to provide language translation capabilities to web pages.


Blink component

Blink>AI>Translate 
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EAI%3ETranslate%22>

TAG review

https://github.com/w3ctag/design-reviews/issues/948

TAG review status

Issues addressed

Origin Trial Name

Translator API

Chromium Trial Name

TranslationAPI

Origin Trial documentation link

https://developer.chrome.com/docs/ai/translator-api

WebFeature UseCounter name

kTranslator_Create

Risks

Interoperability and Compatibility

This feature has definite interoperability risks, including which languages 
are available across different browsers, how they are exposed, the quality 
of translations, and whether developers need the translations to be 
on-device or not. We can ameliorate some of these through API design, by 
making it clear that various methods might fail and that a fallback is 
required. Others, like translation quality, may end up as 
quality-of-implementation issues, similar to other machine learning-based 
APIs like shape detection.


Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1015
)

WebKit: No signal (https://github.com/WebKit/standards-positions/issues/339)

Web developers: Positive (https://github.com/WICG/proposals/issues/147)

Other signals:

Activation

This feature would definitely benefit from having polyfills, backed by any 
of: cloud services, lazily-loaded on-device models using WebGPU, or the web 
developer's own server. We anticipate seeing an ecosystem of such polyfills 
grow as more developers experiment with this API.


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


Goals for experimentation

Reason this experiment is being extended

There has been an overhaul to the API shape in the spec that we're 
currently implementing. We'd like to continue the OT to get feedback on the 
new API shape once it's ready to evaluate.

Substantial progress has been made in the following areas:

   - 
   
   Draft spec: the spec is now complete.
   - 
   
   TAG review: the tag review is complete.
   - 
   
   Signals requests: other browsers have not yet made any progress on these.
   - 
   
   Outreach for feedback from the spec community: we've discussed this API 
   a few times at Web ML Community Group meetings. Additionally, feedback from 
   the internationalization spec community was helpful in resolving 
   https://github.com/webmachinelearning/translation-api/issues/11 
   <https://github.com/webmachinelearning/translation-api/issues/11> .
   - 
   
   WPT tests: we now have some basic WPTs for invalid inputs and a single 
   success case.
   


Ongoing technical constraints

None.


Debuggability

During the origin trial, web developers can use 
chrome://on-device-translation-internals/ to manage language pack 
installation. And, by setting chrome://flags/#translation-api flag to 
"Enabled without language pack limit", developers can work around the 
privacy-focused restrictions during local testing. If the feature is 
successful, these may eventually graduate into DevTools features.


Will this feature be supported on all six Blink platforms (Windows, Mac, 
Linux, ChromeOS, Android, and Android WebView)?

No

Only supported on desktop platforms during the Origin Trial period.


Is this feature fully tested by web-platform-tests 
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?

No

We have some web platform test coverage for this feature (
https://wpt.fyi/results/ai/translator?label=experimental&la
bel=master&aligned), but how much we can guarantee as testable beyond the 
surface API is unclear. For example, since no specific languages are 
guaranteed to be supported, it's not clear we can actually test 
translations. APIs to mock the results might help here. 


Flag name on about://flags

translation-api

Finch feature name

TranslationAPI

Requires code in //chrome?

True

Tracking bug

https://issues.chromium.org/issues/322229993

Measurement

kTranslator_Create

Estimated milestones

Origin trial desktop first

131

Origin trial desktop last

136

Origin trial extension 1 end milestone

138


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).

At this point all known proposed changes have been incorporated into the 
specification and implementation.

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5172811302961152?gate=5155440738172928

Links to previous Intent discussions

Intent to Prototype: https://groups.google.com/a/ch
romium.org/d/msgid/blink-dev/2a9d154a-dc97-495b-afda-ba6437
12116bn%40chromium.org

Intent to Experiment: https://groups.google.com/a/ch
romium.org/d/msgid/blink-dev/CAM0wra9ArjjD0u%3DpFs1W_5%3DcM
k49JXs5ObQ15dNHCHt3TKSW3g%40mail.gmail.com

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