seamless attribute for iframes

The seamless attribute makes an iframe's contents actually part of a page, and adopts the styles from its hosting page. The attribute has been removed from both the WHATWG and the W3C HTML5 specifications.

Unofficial / Note: https://www.w3.org/TR/2011/WD-html5-20110525/the-iframe-element.html#attr-iframe-seamless

Usage: 0% + 0% = 0%

Support summary

IE: Not supported
Edge: Not supported
Firefox: Not supported
Chrome: available but disabled by default since 20
Safari: Not supported, notes for version 7₁
Opera: Not supported
Safari on iOS: Not supported, notes for version 7.0-7.1₁
Opera Mini: Not supported
Android Browser: Not supported
Blackberry Browser: Not supported
Opera Mobile: Not supported
Chrome for Android: Not supported
Firefox for Android: Not supported
IE Mobile: Not supported
UC Browser for Android: Not supported
Samsung Internet: Not supported
QQ Browser: Not supported
Baidu Browser: Not supported
KaiOS Browser: Not supported

Notes

Chrome 20-26 had partial support behind a flag, though this was later removed.

Hides the border of seamless iframes and recognizes the 'seamless' DOM property, but does not provide actual support. ↑

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	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

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	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

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,d	n,d	n,d	n,d	n,d	n,d	n,d	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	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

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	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

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	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

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	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

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	n

Blackberry Browser

7	10
n	n

Opera Mobile

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

Chrome for Android

124
n

Firefox for Android

125
n

IE Mobile

10	11
n	n

UC Browser for Android

15.5
n

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	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n	n

QQ Browser

14.9
n

Baidu Browser

13.52
n

KaiOS Browser

2.5	3.0-3.1
n	n

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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