[1] [CITE@en[Web Tracking Protection]]
( ([TIME[2011-02-24 23:18:00 +09:00]] 版))
<http://www.w3.org/Submission/2011/SUBM-web-tracking-protection-20110224/>

[2] [CITE@en[navigator.doNotTrack - MDN]]
( ([TIME[2012-05-18 08:04:01 +09:00]] 版))
<https://developer.mozilla.org/en/DOM/navigator.doNotTrack>

[3] [CITE@en[887703 - Do not track settings results in wrong value for navigator.doNotTrack]]
([TIME[2017-03-26 15:57:49 +09:00]])
<https://bugzilla.mozilla.org/show_bug.cgi?id=887703>

[FIG(quote)[
[FIGCAPTION[
[4] [CITE@en-US[Navigator.doNotTrack - Web APIs | MDN]]
([TIME[2016-10-30 11:48:19 +09:00]])
<https://developer.mozilla.org/en-US/docs/Web/API/Navigator/doNotTrack>
]FIGCAPTION]

> 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"}

]FIG]


[FIG(quote)[
[FIGCAPTION[
[5] [CITE@en-US[Navigator.doNotTrack - Web APIs | MDN]]
([TIME[2016-10-30 11:48:19 +09:00]])
<https://developer.mozilla.org/en-US/docs/Web/API/Navigator/doNotTrack>
]FIGCAPTION]

> '''['''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.

]FIG]