CSS font-size-adjust

- REC

Method of adjusting the font size in a matter that relates to the height of lowercase vs. uppercase letters. This makes it easier to set the size of fallback fonts.

Chrome

  1. 4 - 42: Not supported
  2. 43 - 119: Disabled by default
  3. 120 - 125: Disabled by default
  4. 126: Disabled by default
  5. 127 - 129: Supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 116: Disabled by default
  3. 117 - 125: Disabled by default
  4. 126: Disabled by default

Safari

  1. 3.1 - 16.3: Not supported
  2. 16.4 - 16.6: Partial support
  3. 17.0 - 17.4: Supported
  4. 17.5: Supported
  5. 17.6 - TP: Supported

Firefox

  1. 2: Not supported
  2. 3 - 91: Partial support
  3. 92 - 117: Partial support
  4. 118 - 127: Supported
  5. 128: Supported
  6. 129 - 131: Supported

Opera

  1. 9 - 29: Not supported
  2. 30 - 101: Disabled by default
  3. 102 - 110: Disabled by default
  4. 111: Disabled by default

IE

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

Chrome for Android

  1. 126: Not supported

Safari on iOS

  1. 3.2 - 16.3: Not supported
  2. 16.4 - 16.7: Partial support
  3. 17.0 - 17.4: Supported
  4. 17.5: Supported
  5. 17.6 - 18.0: Supported

Samsung Internet

  1. 4 - 24: Not supported
  2. 25: Not supported

Opera Mini

  1. all: Not supported

Opera Mobile

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

UC Browser for Android

  1. 15.5: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 126: Not supported

Firefox for Android

  1. 127: Supported

QQ Browser

  1. 14.9: Disabled by default

Baidu Browser

  1. 13.52: Not supported

KaiOS Browser

  1. 2.5: Not supported
  2. 3: Partial support
Resources:
WebKit support bug #15257
MDN Web Docs - CSS font-size-adjust
Article on font-size-adjust