On the standards track: No
Is Experimental: No
Is Deprecated: Yes
In Chrome version 23 on 2012-11-06
In Chrome Android version 25 on 2013-02-27
In Edge version 17 on 2018-04-30 Note: Before version 17, Edge implemented window.doNotTrack.
In Firefox version 9 on 2011-12-20 Note: In Firefox, navigator.doNotTrack returns "unspecified" instead of null. Before Firefox 32, navigator.doNotTrack would report values of "yes" and "no" rather than "1" and "0".
In Firefox for Android version 9 on 2011-12-21 Note: In Firefox for Android, navigator.doNotTrack returns "unspecified" instead of null. Before Firefox for Android 32, navigator.doNotTrack would report values of "yes" and "no" rather than "1" and "0".
In Internet Explorer version 9 on 2011-03-14 Note: For IE11 and subsequent versions, use window.doNotTrack
Removed from Internet Explorer version 11 on 2013-10-17
Not in Node.js
In Quest Browser version 5.0 on undefined
In Opera version 12 on 2012-06-14
In Opera Android version 12 on 2012-02-25
In Safari version 5.1 on 2011-07-20 Removed from Safari version 7 on 2013-10-22
In Safari on iOS version 5 on 2011-10-12 Removed from Safari on iOS version 7 on 2013-09-18
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 5 on 2011-10-12 Removed from WebView on iOS version 7 on 2013-09-18