CSS3 Overflow-wrap

- WD

Allows lines to be broken within words if an otherwise unbreakable string is too long to fit. Currently mostly supported using the word-wrap property.

IE

  1. 5.5 - 10
  2. 11

Edge

  1. 12 - 17
  2. 18 - 81
  3. 83

Firefox

  1. 2 - 3
  2. 3.5 - 48
  3. 49 - 75
  4. 76
  5. 77 - 78

Chrome

  1. 4 - 22
  2. 23 - 81
  3. 83
  4. 84 - 86

Safari

  1. 3.1 - 6
  2. 6.1 - 13
  3. 13.1
  4. TP

Opera

  1. 9 - 10.1
  2. 10.5 - 12
  3. 12.1 - 67
  4. 68

iOS Safari

  1. 3.2 - 6.1
  2. 7 - 13.3
  3. 13.4

Opera Mini

  1. all

Android Browser

  1. 2.1 - 4.3
  2. 4.4 - 4.4.4
  3. 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 - 10.1
  2. 11.1

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

  1. 2.5

Partial support refers to requiring the legacy name "word-wrap" (rather than "overflow-wrap") to work.

Resources:
Bug on Firefox support
MDN Web Docs - CSS overflow-wrap
MDN Web Docs - CSS word-wrap
Microsoft Edge feature request on UserVoice
WebPlatform Docs