Online/offline status

- LS

IE

  1. 8
  2. 9
  3. 10
  4. 11

Edge

  1. 14
  2. 15
  3. 16
  4. 17
  5. 18

Firefox

  1. 58
  2. 59
  3. 60
  4. 61
  5. 62
  6. 63

Chrome

  1. 64
  2. 65
  3. 66
  4. 67
  5. 68
  6. 69
  7. 70

Safari

  1. 10
  2. 10.1
  3. 11
  4. 11.1
  5. 12
  6. TP

Opera

  1. 50
  2. 51
  3. 52
  4. 53

iOS Safari

  1. 10.0-10.2
  2. 10.3
  3. 11.0-11.2
  4. 11.3-11.4
  5. 12

Opera Mini

  1. all

Android Browser

  1. 4.2-4.3
  2. 4.4
  3. 4.4.3-4.4.4
  4. 67

Blackberry Browser

  1. 7
  2. 10

Opera Mobile

  1. 11.5
  2. 12
  3. 12.1
  4. 46

Chrome for Android

  1. 67

Firefox for Android

  1. 60

IE Mobile

  1. 10
  2. 11

UC Browser for Android

  1. 11.8

Samsung Internet

  1. 4
  2. 5
  3. 6.2
  4. 7.2

QQ Browser

  1. 1.2

Baidu Browser

  1. 7.12

"online" does not always mean connection to the internet, it can also just mean connection to some network.

Early versions of Chrome and Safari always reported "true" for navigator.onLine