CSS3 Box-sizing

Method of specifying whether or not an element's borders and padding should be included in size units

Spec	https://www.w3.org/TR/css-sizing/#box-sizing
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	75
	88	88	88	9.1	74
	87	87	87	9	73
	86	86	86	8	72
	85	85	85	7.1	71
	84	84	84	7	70
	83	83	83	6.1	69
	81	82	81	6	68
	80	81	80	5.1	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
		52	51		36
		51	50		35
		50	49		34
		49	48		33
		48	47		32
		47	46		31
		46	45		30
		45	44		29
		44	43		28
		43	42		27
		42	41		26
		41	40		25
		40	39		24
		39	38		23
		38	37		22
		37	36		21
		36	35		20
		35	34		19
		34	33		18
		33	32		17
		32	31		16
		31	30		15
		30	29		12.1
		29	28		12
		28 (*)	27		11.6
		27 (*)	26		11.5
		26 (*)	25		11.1
		25 (*)	24		11
		24 (*)	23		10.6
		23 (*)	22		10.5
		22 (*)	21		10.0-10.1
		21 (*)	20		9.5-9.6
		20 (*)	19		9
		19 (*)	18
		18 (*)	17
		17 (*)	16
		16 (*)	15
		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	105	10	64	105	104	11	13.4	18.0	13.1	13.18	2.5
15.6		4.4.3-4.4.4	7 (*)	12.1			10		17.0
15.5		4.4		12					16.0
15.4		4.2-4.3		11.5					15.0
Show all
15.2-15.3		4.1		11.1					14.0
15.0-15.1		4		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
11.0-11.2
10.3
10.0-10.2
9.3
9.0-9.2
8.1-8.4
8
7.0-7.1
6.0-6.1
5.0-5.1
4.2-4.3 (*)
4.0-4.1 (*)
3.2 (*)

Notes

Firefox versions before 57 also supported the padding-box value for box-sizing, though this value was been removed from the specification and later versions of the browser.

^* Partial support with prefix.

Bugs

• Android browsers do not calculate correctly the dimensions (width and height) of the HTML select element.

• Safari 6.0.x does not use box-sizing on elements with display: table;

• IE9 will subtract the width of the scrollbar to the width of the element when set to position: absolute / fixed , overflow: auto / overflow-y: scroll

• IE 8 ignores box-sizing: border-box if min/max-width/height is used.

• Chrome has problems selecting options from the select element when using box-sizing: border-box and browser zoom level is less than 100%.

• In IE8, the min-width property applies to content-box even if box-sizing is set to border-box.

• In Chrome, the inherit value doesn't work on elements inside details, this could lead to unexpected behaviour when box-sizing: inherit is used in an universal selector, see https://bugs.chromium.org/p/chromium/issues/detail?id=589475

Resources

• MDN Web Docs - CSS box-sizing
• Blog post
• Polyfill for IE
• CSS Tricks
• WebPlatform Docs