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CSS3 Border-radius (rounded corners)

Method of making the border corners round. Covers support for the shorthand border-radius as well as the long-hand properties (e.g. border-top-left-radius)

Spec	http://www.w3.org/TR/css3-background/#the-border-radius
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
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7		50	55	8	42
6		49 ⁽²⁾	54	7.1	41
5.5		48 ⁽²⁾	53	7	40
		47 ⁽²⁾	52	6.1 ⁽¹⁾	39
		46 ⁽²⁾	51	6 ⁽¹⁾	38
		45 ⁽²⁾	50	5.1 ⁽¹⁾	37
		44 ⁽²⁾	49	5	36
		43 ⁽²⁾	48	4 ^(*)	35
		42 ⁽²⁾	47	3.2 ^(*)	34
		41 ⁽²⁾	46	3.1 ^(*)	33
		40 ⁽²⁾	45		32
		39 ⁽²⁾	44		31
		38 ⁽²⁾	43		30
		37 ⁽²⁾	42		29
		36 ⁽²⁾	41		28
		35 ⁽²⁾	40		27
		34 ⁽²⁾	39		26
		33 ⁽²⁾	38		25
		32 ⁽²⁾	37		24
		31 ⁽²⁾	36		23
		30 ⁽²⁾	35		22
		29 ⁽²⁾	34		21
		28 ⁽²⁾	33		20
		27 ⁽²⁾	32		19
		26 ⁽²⁾	31		18
		25 ⁽²⁾	30		17
		24 ⁽²⁾	29		16
		23 ⁽²⁾	28		15
		22 ⁽²⁾	27		12.1
		21 ⁽²⁾	26		12
		20 ⁽²⁾	25		11.6
		19 ⁽²⁾	24		11.5
		18 ⁽²⁾	23		11.1
		17 ⁽²⁾	22		11
		16 ⁽²⁾	21		10.6
		15 ⁽²⁾	20		10.5
		14 ⁽²⁾	19		10.0-10.1
		13 ⁽²⁾	18		9.5-9.6
		12 ⁽²⁾	17		9
		11 ⁽²⁾	16
		10 ⁽²⁾	15
		9 ⁽²⁾	14
		8 ⁽²⁾	13
		7 ⁽²⁾	12
		6 ⁽²⁾	11
		5 ⁽²⁾	10
		4 ⁽²⁾	9
		3.6 ^(2,*)	8
		3.5 ^(2,*)	7
		3 ^(2,*)	6
		2 ^(2,*)	5
			4 ^(*)

iOS Safari	Opera Mini	Android Browser	Blackberry Browser	Opera Mobile	Android Chrome	Android Firefox	IE Mobile	Android UC Browser	Samsung Internet	QQ Browser	Baidu Browser
11
10.3	all	56	10	37	59	54	11	11.4	5	1.2	7.12
10.0-10.2		4.4.3-4.4.4	7	12.1			10		4
9.3		4.4		12
9.0-9.2		4.2-4.3		11.5
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8.1-8.4		4.1		11.1
8		4		11
7.0-7.1		3		10
6.0-6.1		2.3
5.0-5.1		2.2
4.2-4.3		2.1 ^(*)
4.0-4.1
3.2 ^(*)

Notes

Safari 6.1 and earlier did not apply border-radius correctly to image borders: http://stackoverflow.com/q/17202128
Dotted and dashed rounded border corners are rendered as solid in Firefox. see bug

^* Partial support with prefix.

Bugs

Safari does not apply border-radius correctly to image borders: http://stackoverflow.com/q/17202128
Android Browser 2.3 does not support % value for border-radius.
Border-radius does not work on fieldset elements in IE9.
The stock browser on the Samsung Galaxy S4 with Android 4.2 does not support the border-radius shorthand property but does support the long-hand properties for each corner like border-top-left-radius.
Older versions of Safari had a bug where background images would bleed out of the border-radius.
Dotted and dashed rounded border corners are rendered as solid in Firefox. Fixed since Firefox 50. see bug

Resources

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