On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 48 on 2016-01-20
In Chrome Android version 48 on 2016-01-26
In Edge version 15 on 2017-04-05
In Firefox version 34 on 2014-12-01 Note: The ISO/IEC CD 14496-22 3rd edition suggests using the ssty feature to provide glyph variants more suitable for use in scripts (for example primes used as superscripts). Starting with Firefox 29, this is done automatically by the MathML rendering engine. The ISO/IEC CD 14496-22 3rd edition also suggests applying the dtls feature to letters when placing mathematical accents to get dotless forms (for example dotless i, j with a hat). Starting with Firefox 35, this is done automatically by the MathML rendering engine. You can override the default values determined by the MathML rendering engine with CSS. From Firefox 129 the -webkit-font-feature-settings alias has been added to support sites that are still supporting the vendor prefix. From Firefox 4 to Firefox 14 (inclusive), Firefox supported an older, slightly different syntax. See OpenType Font Feature support in Firefox 4.
In Firefox for Android version 34 on 2014-12-01 Note: The ISO/IEC CD 14496-22 3rd edition suggests using the ssty feature to provide glyph variants more suitable for use in scripts (for example primes used as superscripts). Starting with Firefox for Android 29, this is done automatically by the MathML rendering engine. The ISO/IEC CD 14496-22 3rd edition also suggests applying the dtls feature to letters when placing mathematical accents to get dotless forms (for example dotless i, j with a hat). Starting with Firefox for Android 35, this is done automatically by the MathML rendering engine. You can override the default values determined by the MathML rendering engine with CSS. From Firefox for Android 129 the -webkit-font-feature-settings alias has been added to support sites that are still supporting the vendor prefix. From Firefox for Android 4 to Firefox for Android 14 (inclusive), Firefox for Android supported an older, slightly different syntax. See OpenType Font Feature support in Firefox for Android 4.
In Internet Explorer version 10 on 2012-10-26
In Quest Browser version 5.0 on undefined
In Opera version 35 on 2016-02-02
In Opera Android version 35 on 2016-02-04
In Safari version 9.1 on 2016-03-21
In Safari on iOS version 9.3 on 2016-03-21
In Samsung Internet version 5.0 on 2016-12-15
In WebView Android version 4.4 on 2013-12-09
In WebView on iOS version 9.3 on 2016-03-21