CSS Regions

- WD

Method of flowing content into multiple elements.

IE

  1. 5.5 - 9: Not supported
  2. 10: Partial support
  3. 11: Partial support

Edge

  1. 12 - 18: Partial support
  2. 79: Not supported
  3. 80: Not supported

Firefox

  1. 2 - 71: Not supported
  2. 72: Not supported
  3. 73 - 74: Not supported

Chrome

  1. 4 - 14: Not supported
  2. 15 - 18: Partial support
  3. 19 - 34: Disabled by default
  4. 35 - 79: Not supported
  5. 80: Not supported
  6. 81 - 83: Not supported

Safari

  1. 3.1 - 6: Not supported
  2. 6.1 - 11: Supported
  3. 11.1 - 12.1: Not supported
  4. 13: Not supported
  5. TP: Not supported

Opera

  1. 9 - 65: Not supported
  2. 66: Not supported

iOS Safari

  1. 3.2 - 6.1: Not supported
  2. 7 - 11.2: Supported
  3. 11.3 - 13.1: Not supported
  4. 13.2: Not supported
  5. 13.3: Not supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 76: Not supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 46: Not supported

Chrome for Android

  1. 79: Not supported

Firefox for Android

  1. 68: Not supported

IE Mobile

  1. 10: Partial support
  2. 11: Partial support

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 9.2: Not supported
  2. 10.1: Not supported

QQ Browser

  1. 1.2: Not supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
Adobe demos and samples
IE10 developer guide info
Firefox feature request bug
WebPlatform Docs