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
			108
		107	107	TP
		106	106	16.1
11	105	105	105	16.0	91
10	104	104	104	15.6	90
9	103	103	103	15.5	89
8 (2)	102	102	102	15.4	88
Show all
7	101	101	101	15.2-15.3	87
6	100	100	100	15.1	86
5.5	99	99	99	15	85
	98	98	98	14.1	84
	97	97	97	14	83
	96	96	96	13.1	82
	95	95	95	13	81
	94	94	94	12.1	80
	93	93	93	12	79
	92	92	92	11.1	78
	91	91	91	11	77
	90	90	90	10.1	76
	89	89	89	10	75
	88	88	88	9.1	74
	87	87	87	9	73
	86	86	86	8	72
	85	85	85	7.1	71
	84	84	84	7	70
	83	83	83	6.1	69
	81	82	81	6	68
	80	81	80	5.1	67
	79	80	79	5	66
	18	79	78	4	65
	17	78	77	3.2	64
	16	77	76	3.1	63
	15	76	75		62
	14	75	74		60
	13	74	73		58
	12	73	72		57
		72	71		56
		71	70		55
		70	69		54
		69	68		53
		68	67		52
		67	66		51
		66	65		50
		65	64		49
		64	63		48
		63	62		47
		62	61		46
		61	60		45
		60	59		44
		59	58		43
		58	57		42
		57	56		41
		56	55		40
		55	54		39
		54	53		38
		53	52		37
		52	51		36
		51	50		35
		50	49		34
		49	48		33
		48	47		32
		47	46		31
		46	45		30
		45	44		29
		44	43		28
		43	42		27
		42	41		26
		41	40		25
		40 (3)	39		24
		39 (3)	38		23
		38 (3)	37		22
		37 (3)	36		21
		36 (3)	35		20
		35 (3)	34		19
		34 (3)	33		18
		33 (3)	32		17
		32 (3)	31		16
		31 (3)	30		15
		30 (3)	29		12.1
		29 (3)	28		12
		28 (3)	27		11.6
		27 (3)	26		11.5
		26 (3)	25		11.1
		25 (3)	24		11
		24 (3)	23		10.6
		23 (3)	22		10.5
		22 (3)	21		10.0-10.1
		21 (3)	20		9.5-9.6
		20 (3)	19		9
		19 (3)	18
		18 (3)	17
		17 (3)	16
		16 (3)	15
		15 (3)	14
		14 (3)	13
		13 (3)	12
		12 (3)	11
		11 (3)	10
		10 (3)	9
		9 (3)	8
		8 (3)	7
		7 (3)	6
		6 (3)	5
		5 (3)	4
		4 (3)
		3.6
		3.5
		3
		2

Safari on iOS	Opera Mini	Android Browser	Blackberry Browser	Opera Mobile	Android Chrome	Android Firefox	IE Mobile	Android UC Browser	Samsung Internet	QQ Browser	Baidu Browser	KaiOS Browser
16.1
16.0	all	105	10	64	105	104	11	13.4	18.0	13.1	13.18	2.5
15.6		4.4.3-4.4.4	7 (1)	12.1			10		17.0
15.5		4.4		12					16.0
15.4		4.2-4.3		11.5					15.0
Show all
15.2-15.3		4.1		11.1					14.0
15.0-15.1		4		11					13.0
14.5-14.8		3		10					12.0
14.0-14.4		2.3							11.1-11.2
13.4-13.7		2.2							10.1
13.3		2.1							9.2
13.2									8.2
13.0-13.1									7.2-7.4
12.2-12.5									6.2-6.4
12.0-12.1									5.0-5.4
11.3-11.4									4
11.0-11.2
10.3
10.0-10.2
9.3
9.0-9.2
8.1-8.4
8
7.0-7.1
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

• MDN Web Docs - NavigatorOnLine.onLine