Srcset and sizes attributes

The srcset and sizes attributes on img (or source) elements allow authors to define various image resources and "hints" that assist a user agent to determine the most appropriate image source to display (e.g. high-resolution displays, small monitors, etc).

Spec	https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-srcset
Status	WHATWG Living Standard

IE	Edge	Firefox	Chrome	Safari	Opera
			103
		100	102
		99	101	TP
11	99	98	100	15.4	83
10	98	97	99	15.2-15.3	82
9	97	96	98	15.1	81
8	96	95	97	15	80
Show all
7	95	94	96	14.1	79
6	94	93	95	14	78
5.5	93	92	94	13.1	77
	92	91	93	13	76
	91	90	92	12.1	75
	90	89	91	12	74
	89	88	90	11.1	73
	88	87	89	11	72
	87	86	88	10.1	71
	86	85	87	10	70
	85	84	86	9.1	69
	84	83	85	9	68
	83	82	84	8 (2)	67
	81	81	83	7.1 (2)	66
	80	80	81	7	65
	79	79	80	6.1	64
	18	78	79	6	63
	17	77	78	5.1	62
	16	76	77	5	60
	15 (3)	75	76	4	58
	14 (3)	74	75	3.2	57
	13 (3)	73	74	3.1	56
	12 (2)	72	73		55
		71	72		54
		70	71		53
		69	70		52
		68	69		51
		67	68		50
		66	67		49
		65	66		48
		64	65		47
		63	64		46
		62	63		45
		61	62		44
		60	61		43
		59	60		42
		58	59		41
		57	58		40
		56	57		39
		55	56		38
		54	55		37
		53	54		36
		52	53		35
		51	52		34
		50	51		33
		49	50		32
		48	49		31
		47	48		30
		46	47		29
		45	46		28
		44	45		27
		43	44		26
		42	43		25
		41	42		24 (2)
		40	41		23 (2)
		39	40		22 (2)
		38	39		21 (2)
		37 (1)	38		20
		36 (1)	37 (2)		19
		35 (1)	36 (2)		18
		34 (1)	35 (2)		17
		33 (1)	34 (2)		16
		32 (1)	33		15
		31	32		12.1
		30	31		12
		29	30		11.6
		28	29		11.5
		27	28		11.1
		26	27		11
		25	26		10.6
		24	25		10.5
		23	24		10.0-10.1
		22	23		9.5-9.6
		21	22		9
		20	21
		19	20
		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
15.4	all	99	10	64	100	98	11	12.12	16.0	10.4	7.12	2.5
15.2-15.3		4.4.3-4.4.4	7	12.1			10		15.0
15.0-15.1		4.4		12					14.0
14.5-14.8		4.2-4.3		11.5					13.0
Show all
14.0-14.4		4.1		11.1					12.0
13.4-13.7		4		11					11.1-11.2
13.3		3		10					10.1
13.2		2.3							9.2
13.0-13.1		2.2							8.2
12.2-12.5		2.1							7.2-7.4
12.0-12.1									6.2-6.4
11.3-11.4									5.0-5.4
11.0-11.2									4
10.3
10.0-10.2
9.3
9.0-9.2
8.1-8.4 (2)
8 (2)
7.0-7.1
6.0-6.1
5.0-5.1
4.2-4.3
4.0-4.1
3.2

Notes

1. Can be enabled in Firefox by setting the about:config preference dom.image.srcset.enabled to true

2. Supports the subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).

3. Intermittently displays distorted images due to bug present (see known issues)

Bugs

• Edge versions 13, 14 and 15 intermittently display distorted images as soon as they encounter a srcset attribute, seemingly dependent on caching and network timing. see bug

Resources

• Improved support for high-resolution displays with the srcset image attribute
• Blog post on srcset & sizes
• MDN: Responsive images
• MDN: element