Re: [i18n-drafts] Extension subtags (#708)

For `u` extension, see https://www.unicode.org/reports/tr35/tr35.html#u_Extension

A few concrete examples:

### Collation Order (`co`)

`de-DE-u-co-phonebk`

Use German, as spoken in Germany, but when sorting text, apply the German phonebook collation rules.

### Calendar (`ca`)

`th-TH-u-ca-buddhist`

Use Thai, as spoken in Thailand, displaying dates according to the Buddhist calendar system.

### Hour Cycle (`hc`)

`en-u-hc-h12` or `en-u-hc-h23`

Use English, explicitly preferring a 12-hour clock (e.g., 3:00 PM) or a 24-hour clock (e.g., 15:00), respectively.

### Emoji Presentation (`em`)

`en-u-em-emoji` or `en-u-em-text`

For emoji characters, prefer the colorful graphical emoji presentation (or the monochrome text presentation).


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Received on Monday, 7 July 2025 06:41:09 UTC