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Online/offline status

Events to indicate when the user's connected (online and offline events) and the navigator.onLine property to see current status.

Spec https://html.spec.whatwg.org/multipage/browsers.html#browser-state
Status WHATWG Living Standard
IE Edge Firefox Chrome Safari Opera
      73    
    65 72    
    64 71 TP  
11 18 63 70 12 56
10 17 62 69 11.1 55
9 16 61 68 11 54
8 (2) 15 60 67 10.1 53
Show all
7 14 59 66 10 52
6 13 58 65 9.1 51
5.5 12 57 64 9 50
    56 63 8 49
    55 62 7.1 48
    54 61 7 47
    53 60 6.1 46
    52 59 6 45
    51 58 5.1 44
    50 57 5 43
    49 56 4 42
    48 55 3.2 41
    47 54 3.1 40
    46 53   39
    45 52   38
    44 51   37
    43 50   36
    42 49   35
    41 48   34
    40 (3) 47   33
    39 (3) 46   32
    38 (3) 45   31
    37 (3) 44   30
    36 (3) 43   29
    35 (3) 42   28
    34 (3) 41   27
    33 (3) 40   26
    32 (3) 39   25
    31 (3) 38   24
    30 (3) 37   23
    29 (3) 36   22
    28 (3) 35   21
    27 (3) 34   20
    26 (3) 33   19
    25 (3) 32   18
    24 (3) 31   17
    23 (3) 30   16
    22 (3) 29   15
    21 (3) 28   12.1
    20 (3) 27   12
    19 (3) 26   11.6
    18 (3) 25   11.5
    17 (3) 24   11.1
    16 (3) 23   11
    15 (3) 22   10.6
    14 (3) 21   10.5
    13 (3) 20   10.0-10.1
    12 (3) 19   9.5-9.6
    11 (3) 18   9
    10 (3) 17    
    9 (3) 16    
    8 (3) 15    
    7 (3) 14    
    6 (3) 13    
    5 (3) 12    
    4 (3) 11    
    3.6 10    
    3.5 9    
    3 8    
    2 7    
      6    
      5    
      4    
iOS Safari Opera Mini Android Browser Blackberry Browser Opera Mobile Android Chrome Android Firefox IE Mobile Android UC Browser Samsung Internet QQ Browser Baidu Browser
12 all 67 10 46 70 63 11 11.8 7.2 1.2 7.12
11.3-11.4   4.4.3-4.4.4 7 (1) 12.1     10   6.2    
11.0-11.2   4.4   12         5    
10.3   4.2-4.3   11.5         4    
Show all
10.0-10.2   4.1   11.1              
9.3   4   11              
9.0-9.2   3   10              
8.1-8.4   2.3                  
8   2.2                  
7.0-7.1   2.1                  
6.0-6.1                      
5.0-5.1                      
4.2-4.3                      
4.0-4.1                      
3.2                      

Notes

"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

  1. Safari 7.0 supports only the event listener on window, and not on document.body

  2. Seems to support navigator.onLine but not online/offline events.

  3. IE8 only supports the online/offline events on document.body, rather than window.

  4. Desktop Firefox responds to the status of its "Work Offline" mode. If not in that mode, navigator.onLine is always true, regardless of the actual network connectivity status. See bug for details.

Resources

Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
http://caniuse.com/#feat=online-status