letter-spacing CSS property
- RECControls spacing between characters of text (i.e. "tracking" in typographical terms). Not to be confused with kerning.
IE
- 5.5: Support unknown
- 6 - 8: Partial support
- 9 - 10: Supported
- 11: Supported
Edge
- 12 - 87: Supported
- 88: Supported
Firefox
- 2 - 84: Supported
- 85: Supported
- 86 - 87: Supported
Chrome
- 4 - 29: Partial support
- 30 - 87: Supported
- 88: Supported
- 89 - 91: Supported
Safari
- 3.1: Support unknown
- 3.2 - 6: Partial support
- 6.1 - 13.1: Supported
- 14: Supported
- TP: Supported
Opera
- 9 - 9.6: Support unknown
- 10 - 16: Partial support
- 17 - 72: Supported
- 73: Supported
iOS Safari
- 3.2: Support unknown
- 4 - 13.7: Supported
- 14: Supported
Opera Mini
- all: Not supported
Android Browser
- 2.1 - 2.2: Support unknown
- 2.3 - 4.3: Partial support
- 4.4 - 4.4.4: Supported
- 81: Supported
Opera Mobile
- 10 - 12.1: Partial support
- 59: Supported
Chrome for Android
- 88: Supported
Firefox for Android
- 85: Supported
UC Browser for Android
- 12.12: Supported
Samsung Internet
- 4 - 12.0: Supported
- 13.0: Supported
QQ Browser
- 10.4: Supported
Baidu Browser
- 7.12: Supported
KaiOS Browser
- 2.5: Supported
- Resources:
- MDN Web Docs - CSS letter-spacing