#rrggbbaa hex color notation

The CSS Color Module Level 4 defines new 4 & 8 character hex notation for color to include the opacity level.

Spec	https://drafts.csswg.org/css-color/#hex-notation
Status	Unofficial / Note

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	70
	84	82	84	9.1	69
	83	81	83	9	68
	81	80	81	8	67
	80	79	80	7.1	66
	79	78	79	7	65
	18	77	78	6.1	64
	17	76	77	6	63
	16	75	76	5.1	62
	15	74	75	5	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 ⁽¹⁾
		65	66		50 ⁽¹⁾
		64	65		49 ⁽¹⁾
		63	64		48 ⁽¹⁾
		62	63		47 ⁽¹⁾
		61	62		46 ⁽¹⁾
		60	61 ⁽¹⁾		45 ⁽¹⁾
		59	60 ⁽¹⁾		44 ⁽¹⁾
		58	59 ⁽¹⁾		43 ⁽¹⁾
		57	58 ⁽¹⁾		42 ⁽¹⁾
		56	57 ⁽¹⁾		41 ⁽¹⁾
		55	56 ⁽¹⁾		40 ⁽¹⁾
		54	55 ⁽¹⁾		39 ⁽¹⁾
		53	54 ⁽¹⁾		38
		52	53 ⁽¹⁾		37
		51	52 ⁽¹⁾		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

Notes

Only supported in Android WebViews in apps that target Android Pie, due to this issue

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