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CSS font-size-adjust

- CR

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.

IE

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

Edge

  1. 12 - 18: Not supported
  2. 79 - 91: Disabled by default
  3. 92: Disabled by default

Firefox

  1. 2: Not supported
  2. 3 - 89: Supported
  3. 90: Supported
  4. 91 - 92: Supported

Chrome

  1. 4 - 42: Not supported
  2. 43 - 91: Disabled by default
  3. 92: Disabled by default
  4. 93 - 95: Disabled by default

Safari

  1. 3.1 - 14: Not supported
  2. 14.1: Not supported
  3. 15 - TP: Not supported

Opera

  1. 9 - 29: Not supported
  2. 30 - 76: Disabled by default
  3. 77: Disabled by default

Safari on iOS

  1. 3.2 - 14.4: Not supported
  2. 14.5: Not supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 92: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 64: Not supported

Chrome for Android

  1. 92: Not supported

Firefox for Android

  1. 90: Not supported

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 13.0: Not supported
  2. 14.0: Not supported

QQ Browser

  1. 10.4: Disabled by default

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
Article on font-size-adjust
MDN Web Docs - CSS font-size-adjust
Microsoft Edge feature request on UserVoice