Feature Policy

This specification defines a mechanism that allows developers to selectively enable and disable use of various browser features and APIs. Feature Policy is deprecated and has been replaced with Permissions Policy and Document Policy.

Unofficial / Note: https://www.w3.org/TR/2019/WD-feature-policy-1-20190416/

Usage: 76.2% + 20.6% = 96.8%

Support summary

IE: Not supported
Edge: 79, notes for version 88₄
Firefox: partial since 74, notes for version 74₂
Chrome: 74, partial since 60, notes for version 60₁, notes for version 88₄
Safari: partial since 11.1, notes for version 11.1₂
Opera: 62, partial since 47, notes for version 47₁, notes for version 75₄
Safari on iOS: partial since 11.3-11.4, notes for version 11.3-11.4₂
Opera Mini: Not supported
Android Browser: 124
Blackberry Browser: Not supported
Opera Mobile: Not supported, notes for version 80₄
Chrome for Android: Not supported, notes for version 124₄
Firefox for Android: partial since 125, notes for version 125₂
IE Mobile: Not supported
UC Browser for Android: 15.5
Samsung Internet: 11.1-11.2, partial since 8.2, notes for version 8.2₁
QQ Browser: partial since 14.9, notes for version 14.9₁
Baidu Browser: Not supported, notes for version 13.52₄
KaiOS Browser: partial since 3.0-3.1, notes for version 3.0-3.1₂

Notes

Standard support includes the HTTP `Feature-Policy` header, `allow` attribute on iframes and the `document.featurePolicy` JS API.

Older Chromium browsers did not support the JS API. ↑
Safari and Firefox only supports the `allow` attribute on iframes. ↑
Safari doesn't support a list of origins or a wildcard. ↑
At least partially supports Permissions Policy, the main replacement for this spec. ↑

Full support table

IE

5.5	6	7	8	9	10	11
n	n	n	n	n	n	n

Edge

12	13	14	15	16	17	18	79	80	81	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	98	99	100	101	102	103	104	105	106	107	108	109	110	111	112	113	114	115	116	117	118	119	120	121	122	123	124
n	n	n	n	n	n	n	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y

Firefox

2	3	3.5	3.6	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	98	99	100	101	102	103	104	105	106	107	108	109	110	111	112	113	114	115	116	117	118	119	120	121	122	123	124	125	126	127	128
n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a

Chrome

4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80	81	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	98	99	100	101	102	103	104	105	106	107	108	109	110	111	112	113	114	115	116	117	118	119	120	121	122	123	124	125	126	127
n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	a	a	a	a	a	a	a	a	a	a	a	a	a	a	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y

Safari

3.1	3.2	4	5	5.1	6	6.1	7	7.1	8	9	9.1	10	10.1	11	11.1	12	12.1	13	13.1	14	14.1	15	15.1	15.2-15.3	15.4	15.5	15.6	16.0	16.1	16.2	16.3	16.4	16.5	16.6	17.0	17.1	17.2	17.3	17.4	17.5	TP
n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a

Opera

9	9.5-9.6	10.0-10.1	10.5	10.6	11	11.1	11.5	11.6	12	12.1	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	60	62	63	64	65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	98	99	100	101	102	103	104	105	106	107	108	109
n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	a	a	a	a	a	a	a	a	a	a	a	a	a	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y	y

Safari on iOS

3.2	4.0-4.1	4.2-4.3	5.0-5.1	6.0-6.1	7.0-7.1	8	8.1-8.4	9.0-9.2	9.3	10.0-10.2	10.3	11.0-11.2	11.3-11.4	12.0-12.1	12.2-12.5	13.0-13.1	13.2	13.3	13.4-13.7	14.0-14.4	14.5-14.8	15.0-15.1	15.2-15.3	15.4	15.5	15.6-15.8	16.0	16.1	16.2	16.3	16.4	16.5	16.6-16.7	17.0	17.1	17.2	17.3	17.4	17.5
n	n	n	n	n	n	n	n	n	n	n	n	n	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a	a

Opera Mini

all
n

Android Browser

2.1	2.2	2.3	3	4	4.1	4.2-4.3	4.4	4.4.3-4.4.4	124
n	n	n	n	n	n	n	n	n	y

Blackberry Browser

7	10
n	n

Opera Mobile

10	11	11.1	11.5	12	12.1	80
n	n	n	n	n	n	y

Chrome for Android

124
y

Firefox for Android

125
a

IE Mobile

10	11
n	n

UC Browser for Android

15.5
y

Samsung Internet

4	5.0-5.4	6.2-6.4	7.2-7.4	8.2	9.2	10.1	11.1-11.2	12.0	13.0	14.0	15.0	16.0	17.0	18.0	19.0	20	21	22	23	24
n	n	n	n	a	a	a	y	y	y	y	y	y	y	y	y	y	y	y	y	y

QQ Browser

14.9
a

Baidu Browser

13.52
y

KaiOS Browser

2.5	3.0-3.1
n	a

y = supported
a = partially supported, see notes
x = supported with a prefix, e.g. moz, webkit
p = supported with a polyfill
d = available but disabled by default; the feature need to be enabled in about:config, chrome://flags, etc.
n = not supported
u = unknown/untested

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