From daa1a2aff136fa9da1fcc97d7da97a2036fabc77 Mon Sep 17 00:00:00 2001
From: Florian Merz <me@fiji-flo.de>
Date: Thu, 11 Feb 2021 14:51:47 +0100
Subject: unslug uk: move

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 files/uk/web/html/element/script/index.html | 243 ++++++++++++++++++++++++++++
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+---
+title: '<script>: Елементи тега Script'
+slug: Web/HTML/Елемент/script
+translation_of: Web/HTML/Element/script
+---
+<div>{{HTMLRef}}</div>
+
+<p><span class="seoSummary"><strong>HTML <code>&lt;script&gt;</code> </strong>елемент використовується для вбудовування або посилання виконавчого коду; зазвичай використовується для вбудовування або посилання на код JavaScript.</span> Тег <code>&lt;script&gt; може</code> бути використаний для других мов програмування, такі як <a href="/en-US/docs/Web/API/WebGL_API">WebGL</a>'s GLSL та мов для створення шейдерів.</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Категорія вмісту</th>
+   <td><a href="/uk/docs/https://wiki.developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories#Metadata_content">Мета дата</a>, <a href="/uk/docs/https://wiki.developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories#Flow_content">Плаваючий контент</a>, <a href="/uk/docs/https://wiki.developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories#Phrasing_content">Зміст фразування</a>.</td>
+  </tr>
+  <tr>
+   <th scope="row">Дозволений вміст</th>
+   <td>Динамічний сценарій, такий як text/javascript.</td>
+  </tr>
+  <tr>
+   <th scope="row">Опущення тегів</th>
+   <td>{{no_tag_omission}}</td>
+  </tr>
+  <tr>
+   <th scope="row">Дозволені батьки</th>
+   <td>Будь-який елемент, який приймає вміст <a href="/uk/docs/https://wiki.developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories#Metadata_content">метаданих</a>, або будь-який елемент, який приймає <a href="/uk/docs/https://wiki.developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories#Phrasing_content">вміст фраз</a>.</td>
+  </tr>
+  <tr>
+   <th scope="row">Дозволені ролі ARIA</th>
+   <td>Немае</td>
+  </tr>
+  <tr>
+   <th scope="row">DOM-інтерфейс</th>
+   <td>{{domxref("HTMLScriptElement")}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Attributes">Attributes</h2>
+
+<p>Цей елемент включає <a href="/uk/docs/https://wiki.developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes">глобальні атрибути</a>.</p>
+
+<dl>
+ <dt>{{htmlattrdef("async")}}{{HTMLVersionInline(5)}}</dt>
+ <dd>
+ <p>This is a Boolean attribute indicating that the browser should, if possible, load the script asynchronously and then execute it as soon as it’s downloaded.</p>
+
+ <div class="warning">
+ <p>This attribute must not be used if the <code>src</code> attribute is absent (i.e. for inline scripts). If it is included in this case it will have no effect.</p>
+ </div>
+
+ <p>Browsers usually assume the worst case scenario and load scripts synchronously, (i.e. <code>async="false"</code>) during HTML parsing.</p>
+
+ <p>Dynamically inserted scripts (using {{domxref("document.createElement()")}}) load asynchronously by default, so to turn on synchronous loading (i.e. scripts load in the order they were inserted) set <code>async="false"</code>.</p>
+
+ <p>This attribute allows the elimination of <strong>render-blocking JavaScript</strong> where the page would have to load and execute scripts before finishing to render the page. <code>defer</code> has a similar effect in this case.</p>
+
+ <p>See {{anch("Browser compatibility")}} for notes on browser support. See also <a href="/en-US/docs/Games/Techniques/Async_scripts">Async scripts for asm.js</a>.</p>
+ </dd>
+ <dt>{{htmlattrdef("crossorigin")}}</dt>
+ <dd>Normal <code>script</code> elements pass minimal information to the {{domxref('GlobalEventHandlers.onerror', 'window.onerror')}} for scripts which do not pass the standard {{Glossary("CORS")}} checks. To allow error logging for sites which use a separate domain for static media, use this attribute. See <a href="/en-US/docs/Web/HTML/CORS_settings_attributes">CORS settings attributes</a> for a more descriptive explanation of its valid arguments.</dd>
+ <dt>{{htmlattrdef("defer")}}</dt>
+ <dd>
+ <p>This Boolean attribute is set to indicate to a browser that the script is meant to be executed after the document has been parsed, but before firing {{event("DOMContentLoaded")}}.</p>
+
+ <p>Scripts with the <code>defer</code> attribute will prevent the <code>DOMContentLoaded</code> event from firing until the script has loaded and finished evaluating.</p>
+
+ <div class="warning">
+ <p>This attribute must not be used if the <code>src</code> attribute is absent (i.e. for inline scripts), in this case it would have no effect.</p>
+ </div>
+
+ <p>To achieve a similar effect for dynamically inserted scripts use <code>async="false"</code> instead. Scripts with the <code>defer</code> attribute will execute in the order in which they appear in the document.</p>
+
+ <p>This attribute allows the elimination of <strong>render-blocking JavaScript</strong> where the page would have to load and execute scripts before finishing to render the page. <code>async</code> has a similar effect in this case.</p>
+ </dd>
+ <dt>{{htmlattrdef("integrity")}}</dt>
+ <dd>This attribute contains inline metadata that a user agent can use to verify that a fetched resource has been delivered free of unexpected manipulation. See <a href="/en-US/docs/Web/Security/Subresource_Integrity">Subresource Integrity</a>.</dd>
+ <dt>{{htmlattrdef("nomodule")}}</dt>
+ <dd>This Boolean attribute is set to indicate that the script should not be executed in browsers that support<a href="https://hacks.mozilla.org/2015/08/es6-in-depth-modules/"> ES2015 modules</a> — in effect, this can be used to serve fallback scripts to older browsers that do not support modular JavaScript code.</dd>
+ <dt>{{htmlattrdef("nonce")}}</dt>
+ <dd>A cryptographic nonce (number used once) to whitelist inline scripts in a <a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src">script-src Content-Security-Policy</a>. The server must generate a unique nonce value each time it transmits a policy. It is critical to provide a nonce that cannot be guessed as bypassing a resource's policy is otherwise trivial.</dd>
+ <dt id="attr-referrer">{{htmlattrdef("referrerpolicy")}}</dt>
+ <dd>Indicates which <a href="/en-US/docs/Web/API/Document/referrer">referrer</a> to send when fetching the script, or resources fetched by the script:
+ <ul>
+  <li><code>no-referrer</code>: The {{HTTPHeader("Referer")}} header will not be sent.</li>
+  <li><code>no-referrer-when-downgrade</code> (default): The {{HTTPHeader("Referer")}} header will not be sent to {{Glossary("origin")}}s without {{Glossary("TLS")}} ({{Glossary("HTTPS")}}).</li>
+  <li><code>origin</code>: The sent referrer will be limited to the origin of the referring page: its <a href="/en-US/docs/Archive/Mozilla/URIScheme">scheme</a>, {{Glossary("host")}}, and {{Glossary("port")}}.</li>
+  <li><code>origin-when-cross-origin</code>: The referrer sent to other origins will be limited to the scheme, the host, and the port. Navigations on the same origin will still include the path.</li>
+  <li><code>same-origin</code>: A referrer will be sent for {{Glossary("Same-origin policy", "same origin")}}, but cross-origin requests will contain no referrer information.</li>
+  <li><code>strict-origin</code>: Only send the origin of the document as the referrer when the protocol security level stays the same (e.g. HTTPS→HTTPS), but don't send it to a less secure destination (e.g. HTTPS→HTTP).</li>
+  <li><code>strict-origin-when-cross-origin</code>: Send a full URL when performing a same-origin request, but only send the origin when the protocol security level stays the same (e.g.HTTPS→HTTPS), and send no header to a less secure destination (e.g. HTTPS→HTTP).</li>
+  <li><code>unsafe-url</code>: The referrer will include the origin <em>and</em> the path (but not the <a href="/en-US/docs/Web/API/HTMLHyperlinkElementUtils/hash">fragment</a>, <a href="/en-US/docs/Web/API/HTMLHyperlinkElementUtils/password">password</a>, or <a href="/en-US/docs/Web/API/HTMLHyperlinkElementUtils/username">username</a>). <strong>This value is unsafe</strong>, because it leaks origins and paths from TLS-protected resources to insecure origins.</li>
+ </ul>
+
+ <div class="blockIndicator note">
+ <p><strong>Note</strong>: An empty string value (<code>""</code>) is both the default value, and a fallback value if <code>referrerpolicy</code> is not supported. If <code>referrerpolicy</code> is not explicitly specified on the <code>&lt;script&gt;</code> element, it will adopt a higher-level referrer policy, i.e. one set on the whole document or domain. If a higher-level policy is not available, the empty string is treated as being equivalent to <code>no-referrer-when-downgrade</code>.</p>
+ </div>
+ </dd>
+ <dt>{{htmlattrdef("src")}}</dt>
+ <dd>
+ <p>This attribute specifies the <abbr>URI</abbr> of an external script; this can be used as an alternative to embedding a script directly within a document.</p>
+
+ <div class="warning">
+ <p>If a <code>script</code> element has a <code>src</code> attribute specified, it should not have a script embedded inside its tags since it can lead to unexpected behavior. The unexpected behavior is because it is only the JavaScript in the file referenced in the <code>src</code> attribute that will be added to the HTML page.</p>
+ </div>
+ </dd>
+ <dt>{{htmlattrdef("type")}}</dt>
+ <dd>
+ <p>This attribute indicates the type of script represented. The value of this attribute will be in one of the following categories:</p>
+
+ <ul>
+  <li><strong>Omitted or a JavaScript MIME type:</strong> This indicates the script is JavaScript. The HTML5 specification urges authors to omit the attribute rather than provide a redundant MIME type. In earlier browsers, this identified the scripting language of the embedded or imported (via the <code>src</code> attribute) code. JavaScript MIME types are <a href="/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types#JavaScript_types">listed in the specification</a>.</li>
+  <li><strong><code>module</code>:</strong> Causes the code to be treated as a JavaScript module. The processing of the script contents is not affected by the <code>charset</code> and <code>defer</code> attributes. For information on using <code>module</code>, see our <a href="/en-US/docs/Web/JavaScript/Guide/Modules">JavaScript modules</a> guide.</li>
+  <li><strong>Any other value:</strong> The embedded content is treated as a data block which won't be processed by the browser. Developers must use a valid MIME type that is not a JavaScript MIME type to denote data blocks. The <code>src</code> attribute will be ignored.</li>
+ </ul>
+
+ <div class="note">
+ <p><strong>Note: </strong>in Firefox you could specify the version of JavaScript contained in a <code>&lt;script&gt;</code> element by including a non-standard <code>version</code> parameter inside the <code>type</code> attribute — for example <code>type="text/javascript;version=1.8"</code>. This has been removed in Firefox 59 (see {{bug(1428745)}}).</p>
+ </div>
+ </dd>
+</dl>
+
+<h3 id="Deprecated_attributes">Deprecated attributes</h3>
+
+<dl>
+ <dt>{{htmlattrdef("charset")}} {{Deprecated_inline}}</dt>
+ <dd>If present, its value must be an ASCII case-insensitive match for "<code>utf-8</code>". It’s unnecessary to specify the <code>charset</code> attribute, because documents must use UTF-8, and the <code>script</code> element inherits its character encoding from the document.</dd>
+ <dt>{{htmlattrdef("language")}} {{Deprecated_inline}}</dt>
+ <dd>Like the <code>type</code> attribute, this attribute identifies the scripting language in use. Unlike the <code>type</code> attribute, however, this attribute’s possible values were never standardized. The <code>type</code> attribute should be used instead.</dd>
+</dl>
+
+<h2 id="Notes">Notes</h2>
+
+<p>Scripts without {{HTMLAttrxRef("async", "script")}} , {{HTMLAttrxRef("defer", "script")}} or <code>type="module"</code> attributes, as well as inline scripts, are fetched and executed immediately, before the browser continues to parse the page.</p>
+
+<p>The script should be served with the <code>text/javascript</code> MIME type, but browsers are lenient and only block them if the script is served with an image type (<code>image/*</code>); a video type (<code>video/*</code>); an audio (<code>audio/*</code>) type; or <code>text/csv</code>. If the script is blocked, an {{event("error")}} is sent to the element, if not a {{event("load")}} event is sent.</p>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Basic_usage">Basic usage</h3>
+
+<p>These examples show how to import (an external) script using the <code>&lt;script&gt;</code> element in both HTML4 and HTML5:</p>
+
+<pre class="brush: html">&lt;!-- HTML4 --&gt;
+&lt;script type="text/javascript" src="javascript.js"&gt;&lt;/script&gt;
+
+&lt;!-- HTML5 --&gt;
+&lt;script src="javascript.js"&gt;&lt;/script&gt;
+</pre>
+
+<p>And the following examples show how to put (an inline) script inside the <code>&lt;script&gt;</code> element in both HTML4 and HTML5:</p>
+
+<pre class="brush: html">&lt;!-- HTML4 --&gt;
+&lt;script type="text/javascript"&gt;
+  alert("Hello World!");
+&lt;/script&gt;
+
+&lt;!-- HTML5 --&gt;
+&lt;script&gt;
+  alert("Hello World!");
+&lt;/script&gt;</pre>
+
+<h3 id="Module_fallback">Module fallback</h3>
+
+<p>Browsers that support the <code>module</code> value for the <code>type</code> attribute ignore any script with a <code>nomodule</code> attribute. That enables you to use module scripts while also providing <code>nomodule</code>-marked fallback scripts for non-supporting browsers.</p>
+
+<pre class="brush: html">&lt;script type="module" src="main.js"&gt;&lt;/script&gt;
+&lt;script nomodule src="fallback.js"&gt;&lt;/script&gt;</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comments</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName("HTML WHATWG", "scripting.html#the-script-element", "&lt;script&gt;")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td>Removed the {{HTMLAttrxRef("charset", "script")}} attribute</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML5.3", "semantics-scripting.html#the-script-element", "&lt;script&gt;")}}</td>
+   <td>{{Spec2("HTML5.3")}}</td>
+   <td>Removed the {{HTMLAttrxRef("charset", "script")}} attribute</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML5.2", "semantics-scripting.html#the-script-element", "&lt;script&gt;")}}</td>
+   <td>{{Spec2("HTML5.2")}}</td>
+   <td>Adds the <code>module</code> {{HTMLAttrxRef("type", "script")}}</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML5.1", "semantics-scripting.html#the-script-element", "&lt;script&gt;")}}</td>
+   <td>{{Spec2("HTML5.1")}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML5 W3C", "scripting-1.html#script", "&lt;script&gt;")}}</td>
+   <td>{{Spec2("HTML5 W3C")}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML4.01", "interact/scripts.html#h-18.2.1", "&lt;script&gt;")}}</td>
+   <td>{{Spec2("HTML4.01")}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName("Subresource Integrity", "#htmlscriptelement", "&lt;script&gt;")}}</td>
+   <td>{{Spec2("Subresource Integrity")}}</td>
+   <td>Adds the {{HTMLAttrxRef("integrity", "script")}} attribute.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<div>{{Compat("html.elements.script", 2)}}</div>
+
+<h3 id="Compatibility_notes">Compatibility notes</h3>
+
+<p>In older browsers that don't support the <code>async</code> attribute, parser-inserted scripts block the parser; script-inserted scripts execute asynchronously in IE and WebKit, but synchronously in Opera and pre-4 Firefox. In Firefox 4, the <code>async</code> DOM property defaults to <code>true</code> for script-created scripts, so the default behaviour matches the behaviour of IE and WebKit.</p>
+
+<p>To request script-inserted external scripts be executed in the insertion order in browsers where the <code>document.createElement("script").async</code> evaluates to <code>true</code> (such as Firefox 4), set <code>async="false"</code> on the scripts you want to maintain order.</p>
+
+<div class="warning">
+<p>Never call <code>document.write()</code> from an async script. In Firefox 3.6, calling <code>document.write()</code> has an unpredictable effect. In Firefox 4, calling <code>document.write()</code> from an async script has no effect (other than printing a warning to the error console).</p>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("document.currentScript")}}</li>
+ <li><a href="https://pie.gd/test/script-link-events/">Ryan Grove's &lt;script&gt; and &lt;link&gt; node event compatibility chart</a></li>
+ <li><a href="https://flaviocopes.com/javascript-async-defer/">Flavio Copes' article on loading JavaScript efficiently and explaining the differences between <code>async</code> and <code>defer</code></a></li>
+ <li><code><a href="https://bytutorial.com/tutorials/javascript">Javascript tips and tricks</a>.</code></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/Modules">JavaScript modules</a> guide</li>
+</ul>
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