Oops, the CLDR version is 47, not 46. I'll update the chromestatus entry. On Thu, Sep 18, 2025 at 11:40 AM Chromestatus < ad...@cr-status.appspotmail.com> wrote:
> *Contact emails* > foo...@chromium.org, ko...@chromium.org > > *Explainer* > None > > *Specification* > https://tc39.es/ecma402 > > *Design docs* > > https://unicode-org.github.io/icu/download/77.html > https://cldr.unicode.org/downloads/cldr-46 > https://www.unicode.org/versions/Unicode16.0.0 > > *Summary* > ICU is not a feature itself, but the third-party library we use for > general Unicode support. We are using the Blink launch process because > there is web compat risk and security considerations. The upgrade is from > ICU 74.2 to ICU 77.1, the current latest release. ICU 77 contains CLDR 46 > and other changes to support Unicode 16. The web-exposed changes are mainly > the Intl and RegExp APIs, IDNA rules for URLs, and text segmentation. Intl > and RegExp (V8): Lots of small changes. The change of Italian number > formatting is the riskiest and has a dedicated flag, see compat risk > section. IDNA: Generally more things are allowed, and this upgrade improves > our overall test results in WPT. Text segmentation: The most interesting > change is better Japanese line breaking when using `word-break: > auto-phrase`, related to https://chromestatus.com/feature/5133892532568064. > All test changes are explained in > https://docs.google.com/document/d/1lrfJJmWvLXYPYSYlxE3mXTgDZI9U1bw2FrJYrDorgqE/edit?usp=sharing > > *Blink component* > Blink>JavaScript>Internationalization > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EJavaScript%3EInternationalization%22> > > *Web Feature ID* > intl <https://webstatus.dev/features/intl> > > *TAG review* > None > > *TAG review status* > Not applicable > > *Risks* > > > *Interoperability and Compatibility* > ICU upgrades have non-trivial web compat risk and have broken sites in the > past. These steps have been taken to reduce the risk of this upgrade: - > Asked Mozilla about regressions they got when upgrading - Added webexposed > tests for common locales: > https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/webexposed/resources/intl-locales.js > - Explained all test changes we see in Chromium and V8: > https://docs.google.com/document/d/1lrfJJmWvLXYPYSYlxE3mXTgDZI9U1bw2FrJYrDorgqE/edit?usp=sharing > The biggest risk is probably the change for Italian number formatting, > which has generated bugs and discussion for both Firefox and iOS: > https://bugzilla.mozilla.org/show_bug.cgi?id=1940923 > https://stackoverflow.com/q/79621903 A flag was added for this in V8, to > be used as a Finch kill switch for this specific behavior. > > *Gecko*: Shipped/Shipping ( > https://bugzilla.mozilla.org/show_bug.cgi?id=1954425) > > *WebKit*: N/A For Safari, ICU is part of the OS. It looks like iOS 18.5 > upgraded to ICU 76, which includes most of the changes. > > *Web developers*: No signals > > *Other signals*: > > *Security* > There are some changes to IDNA in > https://unicode-org.github.io/icu/download/76.html: "The handling of > UseSTD3ASCIIRules was simplified. Some existing characters changed from > disallowed (when that was only for compatibility with long-obsolete > IDNA2003) to valid." All IDNA-related changes are explained here: > https://docs.google.com/document/d/1lrfJJmWvLXYPYSYlxE3mXTgDZI9U1bw2FrJYrDorgqE/edit?usp=sharing > > *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? No > special risk for WebView, but note that this cannot be put behind a flag > due to the size of the dependency. A flag was added for the change deemed > the riskiest, Italian number formatting. > > > *Debuggability* > None > > *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>?* > NoICU isn't tested primarily through WPT, but a few tests are affected: > https://docs.google.com/document/d/1lrfJJmWvLXYPYSYlxE3mXTgDZI9U1bw2FrJYrDorgqE/edit?tab=t.0#bookmark=id.lm58eue6rpml > ICU has a large impact on Test262 results which can be seen here: > https://chromium-review.googlesource.com/c/v8/v8/+/6586986 > > *Flag name on about://flags* > None > > *Finch feature name* > None > > *Non-finch justification* > We cannot ship two copies of ICU and switch with a flag as ICU is a very > large library. Instead we have carefully analyzed test changes and added a > flag for the risky change that we could identify in V8: > https://chromium-review.googlesource.com/c/v8/v8/+/6944304 That flag can > be controlled with Finch. > > *Rollout plan* > Will ship enabled for all users > > *Requires code in //chrome?* > False > > *Tracking bug* > https://crbug.com/421834885 > > *Sample links* > > https://mathiasbynens.github.io/caniunicode > > *Estimated milestones* > Shipping on desktop 142 > Shipping on Android 142 > Shipping on WebView 142 > > *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). None > > *Link to entry on the Chrome Platform Status* > https://chromestatus.com/feature/5143313833000960?gate=5082343567785984 > > This intent message was generated by Chrome Platform Status > <https://chromestatus.com>. > > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAARdPYcBXt%3Dc_q3LiDWYR3JhwCFmhAMHY5yjmBrnU8VyOAS6qw%40mail.gmail.com.
