Can I use
?

system-ui value for font-family

- WD

Value for font-family that represents the default user interface font.

Chrome

  1. ❌ 4 - 52: Not supported
  2. ◐ 53 - 55: Partial support
  3. ✅ 56 - 155: Supported
  4. ✅ 156: Supported
  5. ✅ 157 - 159: Supported

Edge

  1. ❌ 12 - 18: Not supported
  2. ✅ 79 - 154: Supported
  3. ✅ 155: Supported

Safari

  1. ❌ 3.1 - 8: Not supported
  2. ﹖ 9: Support unknown
  3. ◐ 9.1 - 10.1: Partial support
  4. ✅ 11 - 26.6: Supported
  5. ✅ 27: Supported
  6. ✅ 27.1 - TP: Supported

Firefox

  1. ❌ 2 - 42: Not supported
  2. ◐ 43 - 91: Partial support
  3. ✅ 92 - 157: Supported
  4. ✅ 158: Supported
  5. ✅ 159 - 161: Supported

Opera

  1. ❌ 9 - 42: Not supported
  2. ✅ 43 - 134: Supported
  3. ✅ 135: Supported

IE

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

Chrome for Android

  1. ✅ 156: Supported

Safari on iOS

  1. ❌ 3.2 - 8.4: Not supported
  2. ◐ 9 - 10.3: Partial support
  3. ✅ 11 - 26.6: Supported
  4. ✅ 27.0: Supported
  5. ✅ 27.1 - 27.2: Supported

Samsung Internet

  1. ❌ 4 - 5.4: Not supported
  2. ✅ 6.2 - 29: Supported
  3. ✅ 30: 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 - 4.4.4: Not supported
  2. ✅ 156: Supported

Firefox for Android

  1. ✅ 158: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ◐ 2.5: Partial support
  2. ◐ 3: Partial support
Resources:
Firefox support bug
MDN on the font-family property