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authorFlorian Merz <me@fiji-flo.de>2021-02-11 14:51:05 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 14:51:05 +0100
commitc058fa0fb22dc40ef0225b21a97578cddd0aaffa (patch)
treedf20f8b4c724b61cb9c34cdb450a7ac77d690bd0 /files/ru/web/api/windowbase64
parent8260a606c143e6b55a467edf017a56bdcd6cba7e (diff)
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----
-title: Кодирование и декодирование в формате Base64
-slug: Web/API/WindowBase64/Base64_encoding_and_decoding
-translation_of: Glossary/Base64
----
-<p><strong>Base64</strong> - это группа cхожих <a href="https://en.wikipedia.org/wiki/Binary-to-text_encoding">binary-to-text encoding</a> схем, которые представляют двоичные данные в ASCII-формате методом перевода в radix-64 представление. Термин <em>Base64</em> происходит от a specific <a href="https://en.wikipedia.org/wiki/MIME#Content-Transfer-Encoding">MIME content transfer encoding</a>.</p>
-
-<p>Кодирование Base64 широко используется в случаях, когда требуется перекодировать двоичные данные для передачи по каналу приспособленному для передачи текстовых данных. Это делается с целью защиты двоичных данных от любых возможных повреждений при передаче. Base64 широко используется во многих приложениях, включая электронную почту (<a href="https://en.wikipedia.org/wiki/MIME">MIME</a>), и при сохранении больших объёмов данных в <a href="/en-US/docs/XML">XML</a>.</p>
-
-<p>В языке JavaScript существуют две функции, для кодирования и декодирования данных в/из формат Base64 соответственно:</p>
-
-<ul>
- <li>{{domxref("WindowBase64.btoa","btoa()")}}</li>
- <li>{{domxref("WindowBase64.atob","atob()")}}</li>
-</ul>
-
-<p><code><font face="Arial, x-locale-body, sans-serif"><span style="background-color: #ffffff;">Функция </span></font>atob()</code> декодирует Base64-кодированную строку. В противоположность ей, функция <code>btoa()</code> создаёт Base64 кодированную ASCII строку из "строки" бинарных данных.</p>
-
-<p>Обе функции <code>atob()</code> и <code>btoa()</code> работают со строками. Если вам необходимо работать с <a href="/en-US/docs/Web/API/ArrayBuffer"><code>ArrayBuffers</code></a>, обратитесь к <a href="#">этому параграфу</a>.</p>
-
-<table class="topicpage-table">
- <tbody>
- <tr>
- <td>
- <h2 class="Documentation" id="Documentation" name="Documentation">Документация</h2>
-
- <dl>
- <dt><a href="https://developer.mozilla.org/en-US/docs/data_URIs" title="https://developer.mozilla.org/en-US/docs/data_URIs"><code>data</code> URIs</a></dt>
- <dd><small><code>data</code> URIs, описанные в <a class="external" href="http://tools.ietf.org/html/rfc2397" title="http://tools.ietf.org/html/rfc2397">RFC 2397</a>, позволяют создателям контента встроить в документ маленькие файлы в виде строки (инлайном).</small></dd>
- <dt><a href="https://en.wikipedia.org/wiki/Base64" title="https://en.wikipedia.org/wiki/Base64">Base64</a></dt>
- <dd><small>Wikipedia article about Base64 encoding.</small></dd>
- <dt>{{domxref("WindowBase64.atob","atob()")}}</dt>
- <dd><small>Decodes a string of data which has been encoded using base-64 encoding.</small></dd>
- <dt>{{domxref("WindowBase64.btoa","btoa()")}}</dt>
- <dd><small>Creates a base-64 encoded ASCII string from a "string" of binary data.</small></dd>
- <dt><a href="#The_Unicode_Problem">The "Unicode Problem"</a></dt>
- <dd><small>In most browsers, calling <code>btoa()</code> on a Unicode string will cause a <code>Character Out Of Range</code> exception. This paragraph shows some solutions.</small></dd>
- <dt><a href="/en-US/docs/URIScheme" title="/en-US/docs/URIScheme">URIScheme</a></dt>
- <dd><small>List of Mozilla supported URI schemes</small></dd>
- <dt><a href="/en-US/docs/Web/JavaScript/Typed_arrays/StringView" title="/en-US/docs/Web/JavaScript/Typed_arrays/StringView"><code>StringView</code></a></dt>
- <dd>In this article is published a library of ours whose aims are:
- <ul>
- <li>creating a <a class="external" href="http://en.wikipedia.org/wiki/C_%28programming_language%29" title="http://en.wikipedia.org/wiki/C_%28programming_language%29">C</a>-like interface for strings (i.e. array of characters codes —<a href="/en-US/docs/Web/JavaScript/Typed_arrays/ArrayBufferView" title="/en-US/docs/Web/JavaScript/Typed_arrays/ArrayBufferView"> <code>ArrayBufferView</code></a> in JavaScript) based upon the JavaScript <a href="/en-US/docs/Web/JavaScript/Typed_arrays/ArrayBuffer" title="/en-US/docs/Web/JavaScript/Typed_arrays/ArrayBuffer"><code>ArrayBuffer</code></a> interface,</li>
- <li>creating a collection of methods for such string-like objects (since now: <code>stringView</code>s) which work <strong>strictly on array of numbers</strong> rather than on immutable JavaScript strings,</li>
- <li>working with other Unicode encodings, different from default JavaScript's UTF-16 <a href="/en-US/docs/Web/API/DOMString" title="/en-US/docs/Web/API/DOMString"><code>DOMString</code></a>s,</li>
- </ul>
- </dd>
- </dl>
-
- <p><span class="alllinks"><a href="/en-US/docs/tag/Base64">View All...</a></span></p>
- </td>
- <td>
- <h2 class="Tools" id="Tools" name="Tools">Tools</h2>
-
- <ul>
- <li><a href="#Solution_2_–_rewrite_the_DOMs_atob()_and_btoa()_using_JavaScript's_TypedArrays_and_UTF-8">Rewriting <code>atob()</code> and <code>btoa()</code> using <code>TypedArray</code>s and UTF-8</a></li>
- <li><a href="/en-US/docs/Web/JavaScript/Typed_arrays/StringView" title="/en-US/docs/Web/JavaScript/Typed_arrays/StringView"><code>StringView</code> – a C-like representation of strings based on typed arrays</a></li>
- </ul>
-
- <p><span class="alllinks"><a href="/en-US/docs/tag/Base64">View All...</a></span></p>
-
- <h2 class="Related_Topics" id="Related_Topics" name="Related_Topics">Related Topics</h2>
-
- <ul>
- <li><a href="/en-US/docs/Web/JavaScript/Typed_arrays/ArrayBuffer"><code>ArrayBuffer</code></a></li>
- <li><a href="/en-US/docs/Web/JavaScript/Typed_arrays">Typed arrays</a></li>
- <li><code><a href="/en-US/docs/Web/JavaScript/Typed_arrays/ArrayBufferView">ArrayBufferView</a></code></li>
- <li><a href="/en-US/docs/Web/JavaScript/Typed_arrays/Uint8Array"><code>Uint8Array</code></a></li>
- <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays/StringView" title="/en-US/docs/Web/JavaScript/Typed_arrays/StringView"><code>StringView</code> – a C-like representation of strings based on typed arrays</a></li>
- <li><a href="/en-US/docs/Web/API/DOMString" title="/en-US/docs/Web/API/DOMString"><code>DOMString</code></a></li>
- <li><a href="/en-US/docs/URI" title="/en-US/docs/URI"><code>URI</code></a></li>
- <li><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURI" title="/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURI"><code>encodeURI()</code></a></li>
- </ul>
- </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="The_Unicode_Problem">The "Unicode Problem"</h2>
-
-<p>Since <a href="/en-US/docs/Web/API/DOMString" title="/en-US/docs/Web/API/DOMString"><code>DOMString</code></a>s are 16-bit-encoded strings, in most browsers calling <code>window.btoa</code> on a Unicode string will cause a <code>Character Out Of Range</code> exception if a character exceeds the range of a 8-bit byte (0x00~0xFF). There are two possible methods to solve this problem:</p>
-
-<ul>
- <li>the first one is to escape the whole string (with UTF-8, see {{jsxref("encodeURIComponent")}}) and then encode it;</li>
- <li>the second one is to convert the UTF-16 <a href="/en-US/docs/Web/API/DOMString" title="/en-US/docs/Web/API/DOMString"><code>DOMString</code></a> to an UTF-8 array of characters and then encode it.</li>
-</ul>
-
-<p>Here are the two possible methods.</p>
-
-<h3 id="Solution_1_–_escaping_the_string_before_encoding_it">Solution #1 – escaping the string before encoding it</h3>
-
-<pre class="brush:js">function b64EncodeUnicode(str) {
-  // first we use encodeURIComponent to get percent-encoded UTF-8,
-  // then we convert the percent encodings into raw bytes which
-  // can be fed into btoa.
- return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,
-  function toSolidBytes(match, p1) {
- return String.fromCharCode('0x' + p1);
- }));
-}
-
-b64EncodeUnicode('✓ à la mode'); // "4pyTIMOgIGxhIG1vZGU="
-b64EncodeUnicode('\n'); // "Cg=="
-</pre>
-
-<p>To decode the Base64-encoded value back into a String:</p>
-
-<pre class="brush: js">function b64DecodeUnicode(str) {
-  // Going backwards: from bytestream, to percent-encoding, to original string.
- return decodeURIComponent(atob(str).split('').map(function(c) {
- return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
- }).join(''));
-}
-
-b64DecodeUnicode('4pyTIMOgIGxhIG1vZGU='); // "✓ à la mode"
-b64DecodeUnicode('Cg=='); // "\n"
-</pre>
-
-<p><a href="https://github.com/coolaj86/unibabel-js">Unibabel</a> implements common conversions using this strategy.</p>
-
-<h3 id="Solution_2_–_rewrite_the_DOMs_atob_and_btoa_using_JavaScripts_TypedArrays_and_UTF-8">Solution #2 – rewrite the DOMs <code>atob()</code> and <code>btoa()</code> using JavaScript's <code>TypedArray</code>s and UTF-8</h3>
-
-<p>Use a <a href="/en-US/docs/Web/API/TextEncoder">TextEncoder</a> polyfill such as <a href="https://github.com/inexorabletash/text-encoding">TextEncoding</a> (also includes legacy windows, mac, and ISO encodings), <a href="https://github.com/coolaj86/TextEncoderLite">TextEncoderLite</a>, combined with a <a href="https://github.com/feross/buffer">Buffer</a> and a Base64 implementation such as <a href="https://github.com/beatgammit/base64-js">base64-js</a>.</p>
-
-<p>When a native <code>TextEncoder</code> implementation is not available, the most light-weight solution would be to use <a href="https://github.com/coolaj86/TextEncoderLite">TextEncoderLite</a> with <a href="https://github.com/beatgammit/base64-js">base64-js</a>. Use the browser implementation when you can.</p>
-
-<p>The following function implements such a strategy. It assumes base64-js imported as <code>&lt;script type="text/javascript" src="base64js.min.js"/&gt;</code>. Note that TextEncoderLite only works with UTF-8.</p>
-
-<pre class="brush: js">function Base64Encode(str, encoding = 'utf-8') {
- var bytes = new (TextEncoder || TextEncoderLite)(encoding).encode(str);
- return base64js.fromByteArray(bytes);
-}
-
-function Base64Decode(str, encoding = 'utf-8') {
- var bytes = base64js.toByteArray(str);
- return new (TextDecoder || TextDecoderLite)(encoding).decode(bytes);
-}
-</pre>
diff --git a/files/ru/web/api/windowbase64/btoa/index.html b/files/ru/web/api/windowbase64/btoa/index.html
deleted file mode 100644
index 06b76a6304..0000000000
--- a/files/ru/web/api/windowbase64/btoa/index.html
+++ /dev/null
@@ -1,141 +0,0 @@
----
-title: WindowBase64.btoa()
-slug: Web/API/WindowBase64/btoa
-translation_of: Web/API/WindowOrWorkerGlobalScope/btoa
----
-<div>{{APIRef("HTML DOM")}}</div>
-
-<p>Создает ASCII строку закодированную в base-64 из "строки" бинарных данных.</p>
-
-<p>Будьте внимательней этот способ не подходит для <a href="http://www.unicode.org/standard/WhatIsUnicode.html">Unicode</a> строк! Описание работы с Unicode в секции ниже.</p>
-
-<h2 id="Синтаксис">Синтаксис</h2>
-
-<pre class="syntaxbox">var encodedData = window.btoa(<em>stringToEncode</em>);</pre>
-
-<h2 id="Пример">Пример</h2>
-
-<pre class="brush:js">var encodedData = window.btoa("Hello, world"); // encode a string
-var decodedData = window.atob(encodedData); // decode the string
-</pre>
-
-<h2 id="Замечания">Замечания</h2>
-
-<p>Вы можете воспользоваться этим способом, чтобы избежать проблем при передаче данных через сетевое соединение. Для этого нужно перекодировать данные в base64 и отправить их, и на другой стороне с помощью метода <code>{{domxref("WindowBase64.atob","window.atob()")}}</code> декодировать полученные данные в исходный вид. Например, вы можете перекодировать управляющие символы ASCII с 0 до 31.</p>
-
-<p><code>btoa()</code> также доступна для XPCOM компонентов реализованных в JavaScript, даже если <a href="/en-US/docs/DOM/window" title="DOM/window"><code>window</code></a> не является глобальным объектом в компонентах.</p>
-
-<h2 id="Строки_Юникод">Строки Юникод</h2>
-
-<p>В большинстве браузеров, вызов <code>window.btoa()</code> на Unicode строке выбросит исключение Character Out Of Range (Символ вне допустимого диапазона).</p>
-
-<p>Чтобы избежать этого, воспользуйтесь патерном, предложеным <a class="external" href="http://ecmanaut.blogspot.com/2006/07/encoding-decoding-utf8-in-javascript.html" title="http://ecmanaut.blogspot.com/2006/07/encoding-decoding-utf8-in-javascript.html">Johan Sundström</a>:</p>
-
-<pre class="brush:js">function utf8_to_b64(str) {
- return window.btoa(unescape(encodeURIComponent(str)));
-}
-
-function b64_to_utf8(str) {
- return decodeURIComponent(escape(window.atob(str)));
-}
-
-// Usage:
-utf8_to_b64('✓ à la mode'); // JTI1dTI3MTMlMjUyMCUyNUUwJTI1MjBsYSUyNTIwbW9kZQ==
-b64_to_utf8('JTI1dTI3MTMlMjUyMCUyNUUwJTI1MjBsYSUyNTIwbW9kZQ=='); // "✓ à la mode"
-
-utf8_to_b64('I \u2661 Unicode!'); // SSUyNTIwJTI1dTI2NjElMjUyMFVuaWNvZGUlMjUyMQ==
-b64_to_utf8('SSUyNTIwJTI1dTI2NjElMjUyMFVuaWNvZGUlMjUyMQ=='); // "I ♡ Unicode!"
-
-</pre>
-
-<p>Более правильный и производительный способ - это конвертировать <a href="/en-US/docs/Web/API/DOMString" title="/en-US/docs/Web/API/DOMString"><code>DOMString</code></a> в UTF-8 строку передав <a href="/en-US/docs/Web/JavaScript/Typed_arrays" title="/en-US/docs/Web/JavaScript/Typed_arrays">typed arrays</a>. Как это сделать узнать можно здесь<strong> <a href="/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding#Solution_.232_.E2.80.93_rewriting_atob()_and_btoa()_using_TypedArrays_and_UTF-8" title="/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding#Solution_.232_.E2.80.93_rewriting_atob()_and_btoa()_using_TypedArrays_and_UTF-8">в этом параграфе</a></strong>.</p>
-
-<h2 id="Спецификации">Спецификации</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', '#dom-windowbase64-btoa', 'WindowBase64.btoa()')}}</td>
- <td>{{Spec2('HTML WHATWG')}}</td>
- <td>No change since the latest snapshot, {{SpecName("HTML5.1")}}.</td>
- </tr>
- <tr>
- <td>{{SpecName('HTML5.1', '#dom-windowbase64-btoa', 'WindowBase64.btoa()')}}</td>
- <td>{{Spec2('HTML5.1')}}</td>
- <td>Snapshot of {{SpecName("HTML WHATWG")}}. No change.</td>
- </tr>
- <tr>
- <td>{{SpecName("HTML5 W3C", "#dom-windowbase64-btoa", "WindowBase64.btoa()")}}</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="Совместимость_браузеров">Совместимость браузеров</h2>
-
-<div>{{CompatibilityTable}}</div>
-
-<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 (WebKit)</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatGeckoDesktop(1)}}[1]</td>
- <td>10</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>Android</th>
- <th>Firefox Mobile (Gecko)</th>
- <th>IE Mobile</th>
- <th>Opera Mobile</th>
- <th>Safari Mobile</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatVersionUnknown}}</td>
- <td>{{CompatGeckoMobile(1)}}</td>
- <td>{{CompatNo}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatVersionUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<p>[1] <code>btoa()</code> также доступна для XPCOM компонентов реализованных в JavaScript, даже если <a href="/en-US/docs/DOM/window" title="DOM/window"><code>window</code></a> не является глобальным объектом в компонентах.</p>
-
-<h2 id="Смотрите_также">Смотрите также</h2>
-
-<ul>
- <li><a href="/Web/API/WindowBase64/Base64_encoding_and_decoding">Base64 encoding and decoding</a></li>
- <li><a href="/en-US/docs/data_URIs"><code>data</code> URIs</a></li>
- <li>{{domxref("WindowBase64.atob","window.atob()")}}</li>
- <li><a href="/en-US/docs/Components.utils.importGlobalProperties">Components.utils.importGlobalProperties</a></li>
-</ul>
diff --git a/files/ru/web/api/windowbase64/index.html b/files/ru/web/api/windowbase64/index.html
deleted file mode 100644
index f51b72c102..0000000000
--- a/files/ru/web/api/windowbase64/index.html
+++ /dev/null
@@ -1,121 +0,0 @@
----
-title: WindowBase64
-slug: Web/API/WindowBase64
-tags:
- - API
- - HTML-DOM
- - Helper
- - NeedsTranslation
- - TopicStub
- - WindowBase64
-translation_of: Web/API/WindowOrWorkerGlobalScope
-translation_of_original: Web/API/WindowBase64
----
-<p>{{APIRef("HTML DOM")}}</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>