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:default CSS pseudo-class

The :default pseudo-class matches checkboxes and radio buttons which are checked by default, <option>s with the selected attribute, and the default submit button (if any) of a form.

Spec	https://w3c.github.io/csswg-drafts/selectors-4/#the-default-pseudo
Status	W3C Working Draft

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	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 ⁽¹⁾	75
	88	88	88	9.1 ⁽¹⁾	74
	87	87	87	9 ⁽¹⁾	73
	86	86	86	8 ⁽¹⁾	72
	85	85	85	7.1 ⁽¹⁾	71
	84	84	84	7 ⁽¹⁾	70
	83	83	83	6.1 ⁽¹⁾	69
	81	82	81	6 ⁽¹⁾	68
	80	81	80	5.1 ⁽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 ⁽¹⁾
		52	51		36 ⁽¹⁾
		51	50 ⁽¹⁾		35 ⁽¹⁾
		50	49 ⁽¹⁾		34 ⁽¹⁾
		49	48 ⁽¹⁾		33 ⁽¹⁾
		48	47 ⁽¹⁾		32 ⁽¹⁾
		47	46 ⁽¹⁾		31 ⁽¹⁾
		46	45 ⁽¹⁾		30 ⁽¹⁾
		45	44 ⁽¹⁾		29 ⁽¹⁾
		44	43 ⁽¹⁾		28 ⁽¹⁾
		43	42 ⁽¹⁾		27 ⁽¹⁾
		42	41 ⁽¹⁾		26 ⁽¹⁾
		41	40 ⁽¹⁾		25 ⁽¹⁾
		40	39 ⁽¹⁾		24 ⁽¹⁾
		39	38 ⁽¹⁾		23 ⁽¹⁾
		38	37 ⁽¹⁾		22 ⁽¹⁾
		37	36 ⁽¹⁾		21 ⁽¹⁾
		36	35 ⁽¹⁾		20 ⁽¹⁾
		35	34 ⁽¹⁾		19 ⁽¹⁾
		34	33 ⁽¹⁾		18 ⁽¹⁾
		33	32 ⁽¹⁾		17 ⁽¹⁾
		32	31 ⁽¹⁾		16 ⁽¹⁾
		31	30 ⁽¹⁾		15 ⁽¹⁾
		30	29 ⁽¹⁾		12.1 ⁽²⁾
		29	28 ⁽¹⁾		12 ⁽²⁾
		28	27 ⁽¹⁾		11.6 ⁽²⁾
		27	26 ⁽¹⁾		11.5
		26	25 ⁽¹⁾		11.1
		25	24 ⁽¹⁾		11
		24	23 ⁽¹⁾		10.6
		23	22 ⁽¹⁾		10.5
		22	21 ⁽¹⁾		10.0-10.1
		21	20 ⁽¹⁾		9.5-9.6
		20	19 ⁽¹⁾		9
		19	18 ⁽¹⁾
		18	17 ⁽¹⁾
		17	16 ⁽¹⁾
		16	15 ⁽¹⁾
		15	14
		14	13
		13	12
		12	11
		11	10
		10	9
		9	8
		8	7
		7	6
		6	5
		5	4
		4
		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 ⁽²⁾	105	10 ⁽¹⁾	64	105	104	11	13.4	18.0	13.1	13.18	2.5
15.6		4.4.3-4.4.4 ⁽¹⁾	7	12.1 ⁽²⁾			10		17.0
15.5		4.4 ⁽¹⁾		12					16.0
15.4		4.2-4.3 ⁽¹⁾		11.5					15.0
Show all
15.2-15.3		4.1 ⁽¹⁾		11.1					14.0
15.0-15.1		4 ⁽¹⁾		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 ⁽¹⁾
11.0-11.2
10.3
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
5.0-5.1
4.2-4.3
4.0-4.1
3.2

Notes

Whether <option selected> matches :default (per the spec) was not tested since <select>s and <option>s are generally not styleable, which makes it hard to formulate a test for this.

Does not match <input type="checkbox" checked> or <input type="radio" checked>
Does not match the default submit button of a form

Resources

Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
https://caniuse.com/css-default-pseudo