On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 26 on 2013-03-26
In Chrome Android version 26 on 2013-04-03
In Edge version 12 on 2015-07-29
In Firefox version 16 on 2012-10-09 Note: Before Firefox 57, transitions do not work when transitioning from a text-shadow with a color specified to a text-shadow without a color specified (see bug 726550). Before Firefox 57, cancelling a filling animation (for example, with animation-fill-mode: forwards set) can trigger a transition set on the same element, although only once (see bug 1192592 and these test cases for more information). Before Firefox 57, the background-position property can't be transitioned between two values containing different numbers of <position> values, for example background-position: 10px 10px; and background-position: 20px 20px, 30px 30px; (see bug 1390446).
In Firefox for Android version 16 on 2012-10-09 Note: Before Firefox for Android 57, transitions do not work when transitioning from a text-shadow with a color specified to a text-shadow without a color specified (see bug 726550). Before Firefox for Android 57, cancelling a filling animation (for example, with animation-fill-mode: forwards set) can trigger a transition set on the same element, although only once (see bug 1192592 and these test cases for more information). Before Firefox for Android 57, the background-position property can't be transitioned between two values containing different numbers of <position> values, for example background-position: 10px 10px; and background-position: 20px 20px, 30px 30px; (see bug 1390446).
In Internet Explorer version 10 on 2012-10-26
In Quest Browser version 5.0 on undefined
In Opera version 12.1 on 2012-11-20
In Opera Android version 12.1 on 2012-10-09
In Safari version 9 on 2015-09-30
In Safari on iOS version 9 on 2015-09-16
In Samsung Internet version 1.5 on 2013-09-25
In WebView Android version 4.4 on 2013-12-09
In WebView on iOS version 9 on 2015-09-16