CSS Containment

The CSS contain property lets developers limit the scope of the browser's styles, layout and paint work for faster and more efficient rendering.

Spec	https://www.w3.org/TR/css-contain-1/#contain-property
Status	W3C Recommendation

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	67
	81	81	83	7.1	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	75	76	4	58
	14	74	75	3.2	57
	13	73	74	3.1	56
	12	72	73		55
		71	72		54
		70	71		53
		69	70		52
		68 ⁽¹⁾	69		51
		67 ⁽¹⁾	68		50
		66 ⁽¹⁾	67		49
		65 ⁽¹⁾	66		48
		64 ⁽¹⁾	65		47
		63 ⁽¹⁾	64		46
		62 ⁽¹⁾	63		45
		61 ⁽¹⁾	62		44
		60 ⁽¹⁾	61		43
		59 ⁽¹⁾	60		42
		58 ⁽¹⁾	59		41
		57 ⁽¹⁾	58		40
		56 ⁽¹⁾	57		39
		55 ⁽¹⁾	56		38
		54 ⁽¹⁾	55		37
		53 ⁽¹⁾	54		36
		52 ⁽¹⁾	53		35
		51 ⁽¹⁾	52		34
		50 ⁽¹⁾	51		33
		49 ⁽¹⁾	50		32
		48 ⁽¹⁾	49		31
		47 ⁽¹⁾	48		30
		46 ⁽¹⁾	47		29
		45 ⁽¹⁾	46		28
		44 ⁽¹⁾	45		27
		43 ⁽¹⁾	44		26
		42 ⁽¹⁾	43		25
		41 ⁽¹⁾	42		24
		40	41		23
		39	40		22
		38	39		21
		37	38		20
		36	37		19
		35	36		18
		34	35		17
		33	34		16
		32	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

Notes

Can be enabled in older Gecko engines with the layout.css.contain.enabled flag in about:config
Partially supported in Firefox by enabling "layout.css.contain.enabled" in about:config
Supported in Safari TP by enabling "CSS Containment" under the "Experimental Features" menu

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