CSS3 tab-size

- WD

Method of customizing the width of the tab character. Only effective using 'white-space: pre' or 'white-space: pre-wrap'.

IE

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

Edge

  1. 12 - 18: Not supported
  2. 79 - 96: Supported
  3. 97: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 52: Partial support
  3. 53 - 90: Supported
  4. 91 - 95: Supported
  5. 96: Supported
  6. 97 - 98: Supported

Chrome

  1. 4 - 20: Not supported
  2. 21 - 41: Partial support
  3. 42 - 96: Supported
  4. 97: Supported
  5. 98 - 100: Supported

Safari

  1. 3.1 - 6: Not supported
  2. 6.1 - 13: Partial support
  3. 13.1 - 15.1: Supported
  4. 15.2: Supported
  5. TP: Supported

Opera

  1. 9 - 10.5: Not supported
  2. 10.6 - 12.1: Partial support
  3. 15 - 28: Partial support
  4. 29 - 81: Supported
  5. 82: Supported

Safari on iOS

  1. 3.2 - 6.1: Not supported
  2. 7 - 13.3: Partial support
  3. 13.4 - 15.1: Supported
  4. 15.2: Supported

Opera Mini

  1. all: Partial support

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Partial support
  3. 97: Supported

Opera Mobile

  1. 10: Not supported
  2. 11 - 12.1: Partial support
  3. 64: Supported

Chrome for Android

  1. 97: Supported

Firefox for Android

  1. 95: Supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 14.0: Supported
  2. 15.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Partial support
Resources:
Firefox bug to unprefix `-moz-tab-size`
MDN Web Docs - CSS tab-size
Microsoft Edge feature request on UserVoice