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: Supported
  3. 80: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 52: Partial support
  3. 53 - 72: Supported
  4. 73: Supported
  5. 74 - 75: Supported

Chrome

  1. 4 - 20: Not supported
  2. 21 - 41: Partial support
  3. 42 - 79: Supported
  4. 80: Supported
  5. 81 - 83: Supported

Safari

  1. 3.1 - 6: Not supported
  2. 6.1 - 12.1: Partial support
  3. 13: Partial support
  4. TP: Supported

Opera

  1. 9 - 10.5: Not supported
  2. 10.6 - 12.1: Partial support
  3. 15 - 28: Partial support
  4. 29 - 65: Supported
  5. 66: Supported

iOS Safari

  1. 3.2 - 6.1: Not supported
  2. 7 - 13.1: Partial support
  3. 13.2: Partial support
  4. 13.3: Partial support

Opera Mini

  1. all: Partial support

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Partial support
  3. 80: Supported

Blackberry Browser

  1. 7: Partial support
  2. 10: Partial support

Opera Mobile

  1. 10: Not supported
  2. 11 - 12.1: Partial support
  3. 46: Supported

Chrome for Android

  1. 80: Supported

Firefox for Android

  1. 68: Supported

IE Mobile

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

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 9.2: Supported
  2. 10.1: Supported

QQ Browser

  1. 1.2: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Partial support
Resources:
MDN Web Docs - CSS tab-size
Microsoft Edge feature request on UserVoice