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+---
+title: SharedWorker
+slug: Web/API/SharedWorker
+tags:
+  - API
+  - Interface
+  - NeedsTranslation
+  - Reference
+  - SharedWorker
+  - TopicStub
+  - Web Workers
+  - Workers
+translation_of: Web/API/SharedWorker
+---
+<div>{{APIRef("Web Workers API")}}</div>
+
+<p>The <code><strong>SharedWorker</strong></code> interface represents a specific kind of worker that can be <em>accessed</em> from several browsing contexts, such as several windows, iframes or even workers. They implement an interface different than dedicated workers and have a different global scope, {{domxref("SharedWorkerGlobalScope")}}.</p>
+
+<div class="note">
+<p><strong>Note:</strong> If SharedWorker can be accessed from several browsing contexts, all those browsing contexts must share the exact same origin (same protocol, host and port).</p>
+</div>
+
+<div class="note">
+<p><strong>Note</strong>: In Firefox, shared workers cannot be shared between private (i.e. browsing in a private window) and non-private documents (see {{bug(1177621)}}.)</p>
+</div>
+
+<h2 id="Constructors">Constructors</h2>
+
+<dl>
+ <dt>{{domxref("SharedWorker.SharedWorker", "SharedWorker()")}}</dt>
+ <dd>Creates a shared web worker that executes the script at the specified URL.</dd>
+</dl>
+
+<h2 id="Properties">Properties</h2>
+
+<p><em>Inherits properties from its parent, {{domxref("EventTarget")}}, and implements properties from {{domxref("AbstractWorker")}}.</em></p>
+
+<dl>
+ <dt>{{domxref("AbstractWorker.onerror")}}</dt>
+ <dd>Is an {{domxref("EventListener")}} that is called whenever an {{domxref("ErrorEvent")}} of type <code>error</code> bubbles through the worker.</dd>
+ <dt>{{domxref("SharedWorker.port")}} {{readonlyInline}}</dt>
+ <dd>Returns a {{domxref("MessagePort")}} object used to communicate and control the shared worker.</dd>
+</dl>
+
+<dl>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<p><em>Inherits methods from its parent, {{domxref("EventTarget")}}, and implements methods from {{domxref("AbstractWorker")}}.</em></p>
+
+<h2 id="Example">Example</h2>
+
+<p>In our <a class="external external-icon" href="https://github.com/mdn/simple-shared-worker">Basic shared worker example</a> (<a class="external external-icon" href="http://mdn.github.io/simple-shared-worker/">run shared worker</a>), we have two HTML pages, each of which uses some JavaScript to perform a simple calculation. The different scripts are using the same worker file to perform the calculation — they can both access it, even if their pages are running inside different windows.</p>
+
+<p>The following code snippet shows creation of a <code>SharedWorker</code> object using the {{domxref("SharedWorker.SharedWorker", "SharedWorker()")}} constructor. Both scripts contain this:</p>
+
+<pre class="brush: js">var myWorker = new SharedWorker('worker.js');
+</pre>
+
+<p>Both scripts then access the worker through a {{domxref("MessagePort")}} object created using the {{domxref("SharedWorker.port")}} property. If the onmessage event is attached using addEventListener, the port is manually started using its <code>start()</code> method:</p>
+
+<pre class="brush: js">myWorker.port.start();</pre>
+
+<p>When the port is started, both scripts post messages to the worker and handle messages sent from it using <code>port.postMessage()</code> and <code>port.onmessage</code>, respectively:</p>
+
+<pre class="brush: js">first.onchange = function() {
+  myWorker.port.postMessage([first.value,second.value]);
+  console.log('Message posted to worker');
+}
+
+second.onchange = function() {
+  myWorker.port.postMessage([first.value,second.value]);
+  console.log('Message posted to worker');
+}
+
+myWorker.port.onmessage = function(e) {
+  result1.textContent = e.data;
+  console.log('Message received from worker');
+}</pre>
+
+<p>Inside the worker we use the {{domxref("SharedWorkerGlobalScope.onconnect")}} handler to connect to the same port discussed above. The ports associated with that worker are accessible in the {{event("connect")}} event's <code>ports</code> property — we then use {{domxref("MessagePort")}} <code>start()</code> method to start the port, and the <code>onmessage</code> handler to deal with messages sent from the main threads.</p>
+
+<pre class="brush: js">onconnect = function(e) {
+  var port = e.ports[0];
+
+  port.addEventListener('message', function(e) {
+    var workerResult = 'Result: ' + (e.data[0] * e.data[1]);
+    port.postMessage(workerResult);
+  });
+
+  port.start(); // Required when using addEventListener. Otherwise called implicitly by onmessage setter.
+}</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('HTML WHATWG', "#sharedworker", "SharedWorker")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>No change from {{SpecName("Web Workers")}}.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Support</td>
+   <td>{{CompatChrome(4)}}</td>
+   <td>{{CompatGeckoDesktop(29.0)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatOpera(10.60)}}</td>
+   <td>5<br>
+    {{CompatNo}} 6.1</td>
+  </tr>
+  <tr>
+   <td>Constructor <code>name</code> option</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop(55)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile("33.0")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>11.5</td>
+   <td>5.1<br>
+    {{CompatNo}} 7.1</td>
+  </tr>
+  <tr>
+   <td>Constructor <code>name</code> option</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile(55)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("Worker")}}</li>
+ <li><a class="internal" href="/en-US/docs/Web/Guide/Performance/Using_web_workers">Using web workers</a></li>
+</ul>