CSS Regions

- WD

Method of flowing content into multiple elements.

IE

  1. 5.5 - 9
  2. 10
  3. 11

Edge

  1. 12 - 18
  2. 79 - 81
  3. 83

Firefox

  1. 2 - 77
  2. 78
  3. 79 - 80

Chrome

  1. 4 - 14
  2. 15 - 18
  3. 19 - 34
  4. 35 - 81
  5. 83
  6. 84 - 86

Safari

  1. 3.1 - 6
  2. 6.1 - 11
  3. 11.1 - 13
  4. 13.1
  5. 14 - TP

Opera

  1. 9 - 68
  2. 69

iOS Safari

  1. 3.2 - 6.1
  2. 7 - 11.2
  3. 11.3 - 13.3
  4. 13.4
  5. 14.0

Opera Mini

  1. all

Android Browser

  1. 2.1 - 4.4.4
  2. 81

Blackberry Browser

  1. 7
  2. 10

Opera Mobile

  1. 10 - 12.1
  2. 46

Chrome for Android

  1. 81

Firefox for Android

  1. 68

IE Mobile

  1. 10
  2. 11

UC Browser for Android

  1. 12.12

Samsung Internet

  1. 4 - 11.2
  2. 12.0

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

  1. 2.5
Resources:
Adobe demos and samples
IE10 developer guide info
Firefox feature request bug
WebPlatform Docs