seamless attribute for iframes
- UNOFFThe 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.
Chrome
- 4 - 19: Not supported
- 20 - 26: Disabled by default
- 27 - 122: Not supported
- 123: Not supported
- 124 - 126: Not supported
Edge
- 12 - 122: Not supported
- 123: Not supported
Safari
- 3.1 - 6.1: Not supported
- 7 - 7.1: Not supported
- 8 - 17.3: Not supported
- 17.4: Not supported
- TP: Not supported
Firefox
- 2 - 123: Not supported
- 124: Not supported
- 125 - 127: Not supported
Opera
- 9 - 107: Not supported
- 108: Not supported
IE
- 5.5 - 10: Not supported
- 11: Not supported
Chrome for Android
- 122: Not supported
Safari on iOS
- 3.2 - 6.1: Not supported
- 7: Not supported
- 8 - 17.3: Not supported
- 17.4: Not supported
Samsung Internet
- 4 - 22: Not supported
- 23: Not supported
Opera Mini
- all: Not supported
Opera Mobile
- 10 - 12.1: Not supported
- 80: Not supported
UC Browser for Android
- 15.5: Not supported
Android Browser
- 2.1 - 4.4.4: Not supported
- 122: Not supported
Firefox for Android
- 123: Not supported
QQ Browser
- 14.9: Not supported
Baidu Browser
- 13.52: Not supported
KaiOS Browser
- 2.5: Not supported
- 3: Not supported
Chrome 20-26 had partial support behind a flag, though this was later removed.