From 1109132f09d75da9a28b649c7677bb6ce07c40c0 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:41:45 -0500
Subject: initial commit

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+---
+title: WindowBase64
+slug: Web/API/WindowBase64
+tags:
+  - API
+  - HTML-DOM
+  - Helper
+  - NeedsTranslation
+  - TopicStub
+  - WindowBase64
+translation_of: Web/API/WindowOrWorkerGlobalScope
+---
+<p>{{APIRef}}</p>
+<p>The <code><strong>WindowBase64</strong></code> helper contains utility methods to convert data to and from base64, a binary-to-text encoding scheme. For example it is used in <a href="/en-US/docs/data_URIs">data URIs</a>.</p>
+<p>There is no object of this type, though the context object, either the {{domxref("Window")}} for regular browsing scope, or the {{domxref("WorkerGlobalScope")}}  for workers, implements it.</p>
+<h2 id="Properties">Properties</h2>
+<p><em>This helper neither defines nor inherits any properties.</em></p>
+<h2 id="Methods">Methods</h2>
+<p><em>This helper does not inherit any methods.</em></p>
+<dl>
+ <dt>
+  {{domxref("WindowBase64.atob()")}}</dt>
+ <dd>
+  Decodes a string of data which has been encoded using base-64 encoding.</dd>
+ <dt>
+  {{domxref("WindowBase64.btoa()")}}</dt>
+ <dd>
+  Creates a base-64 encoded ASCII string from a string of binary data.</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', '#windowbase64', 'WindowBase64')}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>No change since the latest snapshot, {{SpecName("HTML5.1")}}.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5.1', '#windowbase64', 'WindowBase64')}}</td>
+   <td>{{Spec2('HTML5.1')}}</td>
+   <td>Snapshot of {{SpecName("HTML WHATWG")}}. No change.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML5 W3C", "#windowbase64", "WindowBase64")}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td>Snapshot of {{SpecName("HTML WHATWG")}}. Creation of <code>WindowBase64</code> (properties where on the target before it).</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>Internet Explorer</th>
+    <th>Opera</th>
+    <th>Safari</th>
+   </tr>
+   <tr>
+    <td>Basic support</td>
+    <td>{{CompatGeckoDesktop(1)}} [1]</td>
+    <td>{{CompatVersionUnknown}}</td>
+    <td>10.0</td>
+    <td>{{CompatVersionUnknown}}</td>
+    <td>{{CompatVersionUnknown}}</td>
+   </tr>
+  </tbody>
+ </table>
+</div>
+<div id="compat-mobile">
+ <table class="compat-table">
+  <tbody>
+   <tr>
+    <th>Feature</th>
+    <th>Firefox Mobile (Gecko)</th>
+    <th>Android</th>
+    <th>IE Mobile</th>
+    <th>Opera Mobile</th>
+    <th>Safari Mobile</th>
+   </tr>
+   <tr>
+    <td>Basic support</td>
+    <td>{{CompatGeckoMobile(1)}}</td>
+    <td rowspan="1">{{CompatVersionUnknown}}</td>
+    <td rowspan="1">{{CompatVersionUnknown}}</td>
+    <td rowspan="1">{{CompatVersionUnknown}}</td>
+    <td rowspan="1">{{CompatVersionUnknown}}</td>
+   </tr>
+  </tbody>
+ </table>
+</div>
+<p>[1]  <code>atob()</code> is also available to XPCOM components implemented in JavaScript, even though {{domxref("Window")}} is not the global object in components.</p>
+<h2 id="See_also">See also</h2>
+<ul>
+ <li><a href="/Web/API/WindowBase64/Base64_encoding_and_decoding">Base64 encoding and decoding</a></li>
+ <li>{{domxref("Window")}}, {{domxref("WorkerGlobalScope")}}, {{domxref("DedicatedWorkerGlobalScope")}}, {{domxref("SharedWorkerGlobalScope")}}, and {{domxref("ServiceWorkerGlobalScope")}}</li>
+</ul>
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