CSS font-feature-settings

- REC

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

Chrome

4 - 15: Not supported
16 - 20: Partial support
21 - 47: Supported
48 - 116: Supported
117: Supported
118 - 120: Supported

Edge

12 - 116: Supported
117: Supported

Safari

3.1 - 3.2: Not supported
4 - 6: Partial support
6.1 - 9: Not supported
9.1 - 16.6: Supported
17.0: Supported
17.1 - TP: Supported

Firefox

2 - 3.6: Not supported
4 - 14: Partial support
15 - 33: Supported
34 - 116: Supported
117: Supported
118 - 120: Supported

Opera

9 - 12.1: Not supported
15 - 34: Supported
35 - 101: Supported
102: Supported

IE

5.5 - 9: Not supported
10: Supported
11: Supported

Chrome for Android

117: Supported

Safari on iOS

3.2 - 6.1: Partial support
7 - 9.2: Not supported
9.3 - 16.6: Supported
17.0: Supported
17.1: Supported

Samsung Internet

4: Supported
5 - 21: Supported
22: Supported

Opera Mini

all: Not supported

Opera Mobile

10 - 12.1: Not supported
73: Supported

UC Browser for Android

15.5: Supported

Android Browser

2.1 - 4.3: Not supported
4.4 - 4.4.4: Supported
117: Supported

Firefox for Android

117: Supported

QQ Browser

13.1: Supported

Baidu Browser

13.18: Supported

KaiOS Browser

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