Form validation

Method of setting required fields and field types without requiring JavaScript. This includes preventing forms from being submitted when appropriate, the checkValidity() method as well as support for the :invalid, :valid, and :required CSS pseudo-classes.

Spec	https://html.spec.whatwg.org/multipage/forms.html#client-side-form-validation
Status	WHATWG Living Standard

IE	Edge	Firefox	Chrome	Safari	Opera
			98
		95	97
		94	96	TP
11	95	93	95	15	80
10	94	92	94	14.1	79
9	93	91	93	14	78
8	92	90	92	13.1	77
Show all
7	91	89	91	13	76
6	90	88	90	12.1	75
5.5	89	87	89	12	74
	88	86	88	11.1	73
	87	85	87	11	72
	86	84	86	10.1	71
	85	83	85	10 ⁽¹⁾	70
	84	82	84	9.1 ⁽¹⁾	69
	83	81	83	9 ⁽¹⁾	68
	81	80	81	8 ⁽¹⁾	67
	80	79	80	7.1 ⁽¹⁾	66
	79	78	79	7 ⁽¹⁾	65
	18	77	78	6.1 ⁽¹⁾	64
	17	76	77	6 ⁽¹⁾	63
	16	75	76	5.1 ⁽¹⁾	62
	15	74	75	5 ⁽¹⁾	60
	14	73	74	4	58
	13	72	73	3.2	57
	12	71	72	3.1	56
		70	71		55
		69	70		54
		68	69		53
		67	68		52
		66	67		51
		65	66		50
		64	65		49
		63	64		48
		62	63		47
		61	62		46
		60	61		45
		59	60		44
		58	59		43
		57	58		42
		56	57		41
		55	56		40
		54	55		39
		53	54		38
		52	53		37
		51	52		36
		50	51		35
		49	50		34
		48	49		33
		47	48		32
		46	47		31
		45	46		30
		44	45		29
		43	44		28
		42	43		27
		41	42		26
		40	41		25
		39	40		24
		38	39		23
		37	38		22
		36	37		21
		35	36		20
		34	35		19
		33	34		18
		32	33		17
		31	32		16
		30	31		15
		29	30		12.1
		28	29		12
		27	28		11.6
		26	27		11.5
		25	26		11.1
		24	25		11
		23	24		10.6
		22	23		10.5
		21	22		10.0-10.1
		20	21		9.5-9.6
		19	20		9
		18	19
		17	18
		16	17
		15	16
		14	15
		13	14
		12	13
		11	12
		10	11
		9	10
		8	9
		7	8
		6	7
		5	6
		4	5
		3.6	4
		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
15	all ⁽³⁾	94	10	64	94	92	11 ⁽²⁾	12.12	15.0	10.4	7.12	2.5 ⁽¹⁾
14.5-14.8		4.4.3-4.4.4	7 ⁽¹⁾	12.1			10 ⁽²⁾		14.0
14.0-14.4		4.4 ⁽¹⁾		12					13.0
13.4-13.7		4.2-4.3 ⁽¹⁾		11.5					12.0
Show all
13.3		4.1 ⁽¹⁾		11.1					11.1-11.2
13.2		4 ⁽¹⁾		11					10.1
13.0-13.1		3		10					9.2
12.2-12.5		2.3							8.2
12.0-12.1		2.2							7.2-7.4
11.3-11.4		2.1							6.2-6.4
11.0-11.2									5.0-5.4
10.3									4
10.0-10.2 ⁽¹⁾
9.3 ⁽¹⁾
9.0-9.2 ⁽¹⁾
8.1-8.4 ⁽¹⁾
8 ⁽¹⁾
7.0-7.1 ⁽¹⁾
6.0-6.1 ⁽¹⁾
5.0-5.1 ⁽¹⁾
4.2-4.3 ⁽¹⁾
4.0-4.1 ⁽¹⁾
3.2

Notes

Partial support refers to lack of notice when form with required fields is attempted to be submitted.
Partial support in IE10 mobile refers to lack of warning when blocking submission.
Partial support in Opera Mini refers to only supporting the CSS pseudo classes.

Bugs

IE10 and 11 have a problem validating number fields in combination with the step attribute and certain values
In Chrome (tested in 45) inputs marked as disabled or hidden while also marked as required are incorrectly being considered for constraint validation. https://html.spec.whatwg.org/multipage/forms.html#concept-fe-disabled
IE & Edge do not support :valid on form elements. Firefox<51 seemed to only match :valid on forms after child element values have changed from an invalid to valid state; see bug #1285425.

Resources

Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
https://caniuse.com/form-validation