Internationalization API

- OTHER

Locale-sensitive collation (string comparison), number formatting, and date and time formatting.

Chrome

  1. 4 - 23: Not supported
  2. 24 - 125: Supported
  3. 126: Supported
  4. 127 - 129: Supported

Edge

  1. 12 - 124: Supported
  2. 125: Supported

Safari

  1. 3.1 - 9.1: Not supported
  2. 10 - 17.4: Supported
  3. 17.5: Supported
  4. 17.6 - TP: Supported

Firefox

  1. 2 - 28: Not supported
  2. 29 - 126: Supported
  3. 127: Supported
  4. 128 - 130: Supported

Opera

  1. 9 - 12.1: Not supported
  2. 15 - 109: Supported
  3. 110: Supported

IE

  1. 5.5 - 10: Not supported
  2. 11: Supported

Chrome for Android

  1. 125: Supported

Safari on iOS

  1. 3.2 - 9.3: Not supported
  2. 10 - 17.4: Supported
  3. 17.5: Supported
  4. 17.6 - 18.0: Supported

Samsung Internet

  1. 4 - 24: Supported
  2. 25: Supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 80: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Supported
  3. 125: Supported

Firefox for Android

  1. 126: Supported

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Not supported
  2. 3: Supported
Resources:
WebKit tracking bug
Firefox for Android tracking bug
Working With Intl
MDN Web Docs - Internationalization
The ECMAScript Internationalization API
Sub-features:
Intl.PluralRules API