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

<p><span class="seoSummary">The <strong><code>WindowOrWorkerGlobalScope</code></strong> mixin describes several features common to the {{domxref("Window")}} and {{domxref("WorkerGlobalScope")}} interfaces.</span> 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.crossOriginIsolated")}} {{readOnlyinline}}</dt>
 <dd>Returns a boolean value that indicates whether a {{jsxref("SharedArrayBuffer")}} can be sent via a {{domxref("Window.postMessage()")}} call.</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 methods 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>(</em><code>sx</code>, <code>sy</code><em>)</em> with width <code>sw</code>, and height <code>sh</code>.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.fetch()")}}</dt>
 <dd>Starts the process of fetching a resource from the network.</dd>
 <dt>{{domxref("WindowOrWorkerGlobalScope.queueMicrotask()")}}</dt>
 <dd>Enqueues a microtask—a short function to be executed after execution of the JavaScript code completes and control isn't being returned to a JavaScript caller, but before handling callbacks and other tasks. This lets your code run without interfering with other, possibly higher priority, code, but <em>before</em> the browser runtime regains control, potentially depending upon the work you need to complete.</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>
 </tbody>
</table>

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



<p>{{Compat("api.WindowOrWorkerGlobalScope")}}</p>

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

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