CSS3 Box-shadow

Method of displaying an inner or outer shadow effect to elements

Spec	http://www.w3.org/TR/css3-background/#box-shadow
Status	W3C Candidate Recommendation

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	45
9	13	52	57	9.1	44
8	12	51	56	9	43
Show all
7		50	55	8	42
6		49	54	7.1	41
5.5		48	53	7	40
		47	52	6.1	39
		46	51	6	38
		45	50	5.1	37
		44	49	5 ^(*)	36
		43	48	4 ^(1,*)	35
		42	47	3.2 ^(1,*)	34
		41	46	3.1 ^(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 ^(*)

Notes

Can be partially emulated in older IE versions using the non-standard "shadow" filter.

Partial support in Safari, iOS Safari and Android Browser refers to missing "inset", blur radius value, and multiple shadow support.

^* Partial support with prefix.

Edge and IE up to 11 suppress box-shadow in tables with border-collapse:collapse. test case
Safari 6, iOS 6 and Android 2.3 default browser don't work with a 0px value for "blur-radius".
e.g. -webkit-box-shadow: 5px 1px 0px 1px #f04e29;
doesn't work, but
-webkit-box-shadow: 5px 1px 1px 1px #f04e29
does.
iOS 8 has a bug where the box shadow disappears when zooming in a certain amount. test case

Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
http://caniuse.com/#feat=css-boxshadow