On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 5 on 2010-05-25 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 12 on 2015-07-29
In Firefox version 17 on 2012-11-20 Note: Previously, the type of sandbox was a DOMString instead of a DOMSettableTokenList. This has been fixed with Firefox 29. Other browsers may still implement the property as DOMString since it was a late change in the specification.
In Firefox for Android version 17 on 2012-11-20 Note: Previously, the type of sandbox was a DOMString instead of a DOMSettableTokenList. This has been fixed with Firefox for Android 29. Other browsers may still implement the property as DOMString since it was a late change in the specification.
In Internet Explorer version 10 on 2012-10-26
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 5 on 2010-06-07
In Safari on iOS version 4 on 2010-06-21
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 Android 50, this property returned the deprecated child DOMSettableTokenList instead of DOMTokenList.
In WebView on iOS version 4 on 2010-06-21