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.
Syntax
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).
Example
dump(navigator.doNotTrack); // prints "1" if DNT is enabled; "0" if the user opted-in for tracking; otherwise this is "unspecified"
Specifications
| 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] 11[3] |
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.
