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 - 121: Disabled by default
  4. 122: Disabled by default
  5. 123 - 125: Disabled by default

Edge

  1. 12 - 18: Not supported
  2. 79 - 116: Disabled by default
  3. 117 - 120: Disabled by default
  4. 121: Disabled by default

Safari

  1. 3.1 - 16.3: Not supported
  2. 16.4 - 16.6: Partial support
  3. 17.0 - 17.2: Supported
  4. 17.3: Supported
  5. 17.4 - TP: Supported

Firefox

  1. 2: Not supported
  2. 3 - 91: Partial support
  3. 92 - 117: Partial support
  4. 118 - 122: Supported
  5. 123: Supported
  6. 124 - 126: Supported

Opera

  1. 9 - 29: Not supported
  2. 30 - 101: Disabled by default
  3. 102 - 105: Disabled by default
  4. 106: Disabled by default

IE

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

Chrome for Android

  1. 121: Not supported

Safari on iOS

  1. 3.2 - 16.3: Not supported
  2. 16.4 - 16.7: Partial support
  3. 17.0 - 17.2: Supported
  4. 17.3: Supported
  5. 17.4: Supported

Samsung Internet

  1. 4 - 22: Not supported
  2. 23: Not supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 73: Not supported

UC Browser for Android

  1. 15.5: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 121: Not supported

Firefox for Android

  1. 122: Supported

QQ Browser

  1. 13.1: Disabled by default

Baidu Browser

  1. 13.18: 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