Intent to prototype and ship: Intl.LocaleInfo

[Daniel Minor]

As of Firefox 153, I intend to turn Intl.LocaleInfo on by default. It has been developed behind the javascript.options.experimental.intl_locale_info preference. Our implementation was contributed by André Bargull, thanks Anba!

Summary:
Intl.LocaleInfo adds locale-specific information APIs to Intl.Locale, including week data, text direction, hour cycle, calendars, collations, numbering systems, and measurement systems. This improves interoperability and enables web developers to build better locale-aware experiences without relying on CLDR data.

Bug to turn on by default:
https://bugzilla.mozilla.org/show_bug.cgi?id=2037069

Specification:
https://github.com/tc39/proposal-intl-locale-info

Standards Body:
TC39

Platform Coverage:
All

Preference:
javascript.options.experimental.intl_locale_info

DevTools Bug:
N/A

Extensions Bug:
N/A

Use Counter:
N/A

Standards-Positions Discussion:
N/A

Other Browsers (according to MDN compatibility data):

• Blink: Chromium 130
• WebKit: Safari 17

web-platform-tests:
Covered by Test262, e.g. https://github.com/tc39/test262/tree/main/test/intl402/Locale/prototype.

[Tom Ritter]

Do we have tests that ensure this respects the locale spoofing preference?

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[Daniel Minor]

If the preference is `privacy.spoof_english`, then no. What would the expected behaviour be in this case? The new APIs allow querying any provided Locale, not just specifically the user's Locale, so offhand, I wouldn't expect the pref to change the behaviour.

[Tom Ritter]

> What would the expected behaviour be in this case?

If you're querying a specific locale, that's fine, but if you can omit that argument and just get the values for the user's locale, then it should respect the override and return the English/overwridden values.

-tom