On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 15 on 2011-10-25 Note: Before Chrome 50, this property returned the deprecated child DOMSettableTokenList instead of DOMTokenList.
In Chrome Android version 18 on 2012-06-27 Note: Before Chrome Android 50, this property returned the deprecated child DOMSettableTokenList instead of DOMTokenList.
In Edge version 79 on 2020-01-15
In Firefox version 31 on 2014-07-22
In Firefox for Android version 31 on 2014-07-22
Not in Internet Explorer
In Quest Browser version 5.0 on undefined Note: Before Quest Browser 5.0, this property returned the deprecated child DOMSettableTokenList instead of DOMTokenList.
In Opera version 15 on 2013-07-02 Note: Before Opera 37, this property returned the deprecated child DOMSettableTokenList instead of DOMTokenList.
In Opera Android version 14 on 2013-05-21 Note: Before Opera Android 37, this property returned the deprecated child DOMSettableTokenList instead of DOMTokenList.
In Safari version 6 on 2012-07-25
In Safari on iOS version 6 on 2012-09-10
In Samsung Internet version 1.0 on 2013-04-27 Note: Before Samsung Internet 5.0, this property returned the deprecated child DOMSettableTokenList instead of DOMTokenList.
In WebView Android version 4.4 on 2013-12-09 Note: Before WebView 50, this property returned the deprecated child DOMSettableTokenList instead of DOMTokenList.
In WebView on iOS version 6 on 2012-09-10