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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
		57	62
		56	61	TP	48
	16	55	60	11	47
11	15	54	59	10.1	46
10	14	53	58	10 ⁽¹⁾	45
9	13	52	57	9.1 ⁽¹⁾	44
8	12	51	56	9 ⁽¹⁾	43
Show all
7		50	55	8 ⁽¹⁾	42
6		49	54	7.1 ⁽¹⁾	41
5.5		48	53	7 ⁽¹⁾	40
		47	52	6.1 ⁽¹⁾	39
		46	51	6 ⁽¹⁾	38
		45	50	5.1 ⁽¹⁾	37
		44	49	5 ⁽¹⁾	36
		43	48	4	35
		42	47	3.2	34
		41	46	3.1	33
		40	45		32
		39	44		31
		38	43		30
		37	42		29
		36	41		28
		35	40		27
		34	39		26
		33	38		25
		32	37		24
		31	36		23
		30	35		22
		29	34		21
		28	33		20
		27	32		19
		26	31		18
		25	30		17
		24	29		16
		23	28		15
		22	27		12.1
		21	26		12
		20	25		11.6
		19	24		11.5
		18	23		11.1
		17	22		11
		16	21		10.6
		15	20		10.5
		14	19		10.0-10.1
		13	18		9.5-9.6
		12	17		9
		11	16
		10	15
		9	14
		8	13
		7	12
		6	11
		5	10
		4	9
		3.6	8
		3.5	7
		3	6
		2	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
11
10.3	all ⁽³⁾	56	10	37	59	54	11 ⁽²⁾	11.4	5	1.2	7.12
10.0-10.2 ⁽¹⁾		4.4.3-4.4.4	7 ⁽¹⁾	12.1			10 ⁽²⁾		4
9.3 ⁽¹⁾		4.4 ⁽¹⁾		12
9.0-9.2 ⁽¹⁾		4.2-4.3 ⁽¹⁾		11.5
Show all
8.1-8.4 ⁽¹⁾		4.1 ⁽¹⁾		11.1
8 ⁽¹⁾		4 ⁽¹⁾		11
7.0-7.1 ⁽¹⁾		3		10
6.0-6.1 ⁽¹⁾		2.3
5.0-5.1 ⁽¹⁾		2.2
4.2-4.3 ⁽¹⁾		2.1
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. See WebKit bug.
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.
http://caniuse.com/#feat=form-validation