Can I use
?

gap property for Flexbox

- WD

gap for flexbox containers to create gaps/gutters between flex items

IE

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

Edge

  1. 12 - 83: Not supported
  2. 84 - 86: Supported
  3. 87: Supported

Firefox

  1. 2 - 62: Not supported
  2. 63 - 83: Supported
  3. 84: Supported
  4. 85 - 86: Supported

Chrome

  1. 4 - 83: Not supported
  2. 84 - 86: Supported
  3. 87: Supported
  4. 88 - 90: Supported

Safari

  1. 3.1 - 13.1: Not supported
  2. 14: Not supported
  3. TP: Supported

Opera

  1. 9 - 71: Not supported
  2. 72: Not supported

iOS Safari

  1. 3.2 - 13.7: Not supported
  2. 14: Not supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 81: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 59: Not supported

Chrome for Android

  1. 87: Supported

Firefox for Android

  1. 83: Supported

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 12.0: Not supported
  2. 13.0: Not supported

QQ Browser

  1. 10.4: Not supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
Chrome bug to track implementation
Webkit support bug
MDN browser compatibility
Workaround using negative margins
Spec discussion