CSS font-feature-settings

- CR

Method of applying advanced typographic and language-specific font features to supported OpenType fonts.

IE

  1. 5.5 - 9: Not supported
  2. 10: Supported
  3. 11: Supported

Edge

  1. 12 - 84: Supported
  2. 85: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 14: Partial support
  3. 15 - 33: Supported
  4. 34 - 79: Supported
  5. 80: Supported
  6. 81 - 82: Supported

Chrome

  1. 4 - 15: Not supported
  2. 16 - 20: Partial support
  3. 21 - 47: Supported
  4. 48 - 84: Supported
  5. 85: Supported
  6. 86 - 88: Supported

Safari

  1. 3.1 - 3.2: Not supported
  2. 4 - 6: Partial support
  3. 6.1 - 9: Not supported
  4. 9.1 - 13.1: Supported
  5. 14: Supported
  6. TP: Supported

Opera

  1. 9 - 12.1: Not supported
  2. 15 - 34: Supported
  3. 35 - 69: Supported
  4. 70: Supported

iOS Safari

  1. 3.2 - 6.1: Partial support
  2. 7 - 9.2: Not supported
  3. 9.3 - 13.7: Supported
  4. 14.0: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Supported
  3. 81: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 46: Supported

Chrome for Android

  1. 85: Supported

Firefox for Android

  1. 79: Supported

IE Mobile

  1. 10: Not supported
  2. 11: Not supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4: Supported
  2. 5 - 11.2: Supported
  3. 12.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported

Whenever possible, font-variant shorthand property or an associated longhand property, font-variant-ligatures, font-variant-caps, font-variant-east-asian, font-variant-alternates, font-variant-numeric or font-variant-position should be used. This property is a low-level feature designed to handle special cases where no other way to enable or access an OpenType font feature exists. In particular, this CSS property shouldn't be used to enable small caps.

Resources:
Syntax for OpenType features in CSS (Adobe Typekit Help)
Detailed tables on accessability support
Demo pages (IE/Firefox only)
MDN Web Docs - font-feature-settings
Mozilla hacks article
OpenType layout feature tag registry
WebPlatform Docs