---
title: WindowOrWorkerGlobalScope
slug: Web/API/WindowOrWorkerGlobalScope
tags:
  - API
  - DOM
  - DOM API
  - NeedsTranslation
  - Service Worker
  - TopicStub
  - Window
  - WindowOrWorkerGlobalScope
  - Worker
  - WorkerGlobalScope
translation_of: Web/API/WindowOrWorkerGlobalScope
---
<div>{{ApiRef()}}</div>

<p>The <strong><code>WindowOrWorkerGlobalScope</code></strong> mixin describes several features common to the {{domxref("Window")}} and {{domxref("WorkerGlobalScope")}} interfaces. Each of these interfaces can, of course, add more features in addition to the ones listed below.</p>

<div class="note">
<p><strong>Note</strong>: <code>WindowOrWorkerGlobalScope</code> is a mixin and not an interface; you can't actually create an object of type <code>WindowOrWorkerGlobalScope</code>.</p>
</div>

<h2 id="Properties_2">Properties</h2>

<p>These properties are defined on the {{domxref("WindowOrWorkerGlobalScope")}} mixin, and implemented by {{domxref("Window")}} and {{domxref("WorkerGlobalScope")}}.</p>

<div id="Properties">
<dl>
 <dt>{{domxref("WindowOrWorkerGlobalScope.caches")}} {{readOnlyinline}}</dt>
 <dd>Returns the {{domxref("CacheStorage")}} object associated with the current context. This object enables functionality such as storing assets for offline use, and generating custom responses to requests.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.indexedDB")}} {{readonlyInline}}</dt>
 <dd>Provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an {{domxref("IDBFactory")}} object.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.isSecureContext")}} {{readOnlyinline}}</dt>
 <dd>Returns a boolean indicating whether the current context is secure (<code>true</code>) or not (<code>false</code>).</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.origin")}} {{readOnlyinline}}</dt>
 <dd>Returns the origin of the global scope, serialized as a string.</dd>
</dl>
</div>

<h2 id="Methods">Methods</h2>

<p>These properties are defined on the {{domxref("WindowOrWorkerGlobalScope")}} mixin, and implemented by {{domxref("Window")}} and {{domxref("WorkerGlobalScope")}}.</p>

<dl>
 <dt>{{domxref("WindowOrWorkerGlobalScope.atob()")}}</dt>
 <dd>Decodes a string of data which has been encoded using base-64 encoding.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.btoa()")}}</dt>
 <dd>Creates a base-64 encoded ASCII string from a string of binary data.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.clearInterval()")}}</dt>
 <dd>Cancels the repeated execution set using {{domxref("WindowOrWorkerGlobalScope.setInterval()")}}.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.clearTimeout()")}}</dt>
 <dd>Cancels the delayed execution set using {{domxref("WindowOrWorkerGlobalScope.setTimeout()")}}.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.createImageBitmap()")}}</dt>
 <dd>Accepts a variety of different image sources, and returns a {{domxref("Promise")}} which resolves to an {{domxref("ImageBitmap")}}. Optionally the source is cropped to the rectangle of pixels originating at <em>(sx, sy)</em> with width sw, and height sh.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.fetch()")}}</dt>
 <dd>Starts the process of fetching a resource from the network.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.setInterval()")}}</dt>
 <dd>Schedules a function to execute every time a given number of milliseconds elapses.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.setTimeout()")}}</dt>
 <dd>Schedules a function to execute in a given amount of time.</dd>
</dl>

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

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName("HTML WHATWG",'webappapis.html#windoworworkerglobalscope-mixin', '<code>WindowOrWorkerGlobalScope</code> mixin')}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>This is where the main mixin is defined.</td>
  </tr>
  <tr>
   <td>{{SpecName('Fetch','#fetch-method','fetch()')}}</td>
   <td>{{Spec2('Fetch')}}</td>
   <td>Definition of the <code>fetch()</code> method.</td>
  </tr>
  <tr>
   <td>{{SpecName('Service Workers', '#self-caches', 'caches')}}</td>
   <td>{{Spec2('Service Workers')}}</td>
   <td>Definition of the <code>caches</code> property.</td>
  </tr>
  <tr>
   <td>{{SpecName('IndexedDB 2', '#dom-windoworworkerglobalscope-indexeddb', 'indexedDB')}}</td>
   <td>{{Spec2('IndexedDB 2')}}</td>
   <td>Definition of the <code>indexedDB</code> property.</td>
  </tr>
  <tr>
   <td>{{SpecName('Secure Contexts', 'webappapis.html#dom-origin', 'isSecureContext')}}</td>
   <td>{{Spec2('Secure Contexts')}}</td>
   <td>Definition of the <code>isSecureContext</code> property.</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>Firefox (Gecko)</th>
   <th>Chrome</th>
   <th>Edge</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatGeckoDesktop(52)}}</td>
   <td>54</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
  <tr>
   <td><code>origin</code></td>
   <td>{{CompatGeckoDesktop(54)}}</td>
   <td>59</td>
   <td>{{CompatUnknown}}</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 Webview</th>
   <th>Edge</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Android</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
   <th>Chrome for Android</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatGeckoMobile(52)}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>54</td>
  </tr>
  <tr>
   <td><code>origin</code></td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatGeckoMobile(54)}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>59</td>
  </tr>
 </tbody>
</table>
</div>

<p> </p>

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

<ul>
 <li>{{domxref("Window")}}</li>
 <li>{{domxref("WorkerGlobalScope")}}</li>
</ul>