On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 50 on 2016-04-13 Note: Before Chrome 50, this property was part of the deprecated child DOMSettableTokenList interface.
In Chrome Android version 50 on 2016-04-13 Note: Before Chrome Android 50, this property was part of the deprecated child DOMSettableTokenList interface.
In Edge version 17 on 2018-04-30
In Firefox version 47 on 2016-06-07
In Firefox for Android version 47 on 2016-06-07
Not in Internet Explorer
In Quest Browser version 5.0 on undefined Note: Before Quest Browser 5.0, this property was part of the deprecated child DOMSettableTokenList interface.
In Opera version 37 on 2016-05-04 Note: Before Opera 37, this property was part of the deprecated child DOMSettableTokenList interface.
In Opera Android version 37 on 2016-06-16 Note: Before Opera Android 37, this property was part of the deprecated child DOMSettableTokenList interface.
In Safari version 10 on 2016-09-20
In Safari on iOS version 10 on 2016-09-13
In Samsung Internet version 5.0 on 2016-12-15 Note: Before Samsung Internet 5.0, this property was part of the deprecated child DOMSettableTokenList interface.
In WebView Android version 50 on 2016-04-13 Note: Before WebView Android 50, this property was part of the deprecated child DOMSettableTokenList interface.
In WebView on iOS version 10 on 2016-09-13