This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

Returns the user's do-not-track setting. This is "1" if the user has requested not to be tracked by web sites, content, or advertising.


dnt = navigator.doNotTrack;

The value reflects that of the do-not-track header, i.e. values of {"1", "0", "unspecified" }. Note: Prior to Gecko 32, Gecko used the values { "yes", "no", "unspecified"} (bug 887703).


// prints "1" if DNT is enabled; "0" if the user opted-in for tracking; otherwise this is "unspecified"


Specification Status Comment
Tracking Preference Expression (DNT)
The definition of 'Navigator.doNotTrack' in that specification.
Working Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 23 9.0 (9.0)[1] 9[2]
12 5.1[4]
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? 9.0 (9.0)[1] ?[2] ? ?

[1] Prior to Gecko 32 Firefox would report navigator.doNotTrack with values of yes and no rather than 1 and 0.

[2] Internet Explorer 9 and 10 use a vendor prefix, i.e. navigator.msDoNotTrack.

[3] Internet Explorer 11 uses window.doNotTrack rather than navigator.doNotTrack.

[4] Safari 7.1.3+ uses window.doNotTrack rather than navigator.doNotTrack.

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API DOM Experimental Expérimental Property Reference Référence