Revision 1136331 of DNT

<div>{{HTTPSidebar}}</div>

<p>The <strong><code>DNT</code></strong> (<strong>D</strong>o <strong>N</strong>ot <strong>T</strong>rack) request header indicates the user's tracking preference. It lets users indicate whether would prefer privacy rather than personalized content.</p>

<table class="properties">
 <tbody>
  <tr>
   <th scope="row">Header type</th>
   <td>{{Glossary("Request header")}}</td>
  </tr>
  <tr>
   <th scope="row">{{Glossary("Forbidden header name")}}</th>
   <td>yes</td>
  </tr>
 </tbody>
</table>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox">
DNT: 0
DNT: 1
</pre>

<h2 id="Directives">Directives</h2>

<dl>
 <dt>0</dt>
 <dd>The user prefers to allow tracking on the target site.</dd>
 <dt>1</dt>
 <dd>The user prefers not to be tracked on the target site.</dd>
</dl>

<h2 id="Examples">Examples</h2>

<h3>Reading Do Not Track status from JavaScript</h3>

<p>The user's DNT preference can also be read from JavaScript using the {{domxref("Navigator.doNotTrack")}} property:</p>

<pre class="brush: js">
navigator.doNotTrack; // "0" or "1"</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('Tracking','#dnt-header-field', 'DNT Header Field for HTTP Requests')}}</td>
   <td>{{Spec2("Tracking")}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>

<p>{{Compat}}</p>

<h2 id="See_also">See also</h2>

<ul>
 <li>{{domxref("Navigator.doNotTrack")}}</li>
 <li>{{HTTPHeader("Tk")}}</li>
</ul>