From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:42:52 -0500
Subject: initial commit

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+---
+title: ':fullscreen'
+slug: 'Web/CSS/:fullscreen'
+translation_of: 'Web/CSS/:fullscreen'
+---
+<div>{{CSSRef}}</div>
+
+<p><span class="seoSummary">A pseudo-classe <strong><code>:fullscreen</code></strong> do CSS representa os elementos que estão atualmente no modo tela-cheia. Se vários elementos estiverem em tela-cheia, isto seleciona todos.</span></p>
+
+<h2 id="Sintaxe">Sintaxe</h2>
+
+<pre class="syntaxbox notranslate">{{csssyntax}}</pre>
+
+<h2 id="Usage_notes">Usage notes</h2>
+
+<p>The <code>:fullscreen</code> pseudo-class lets you configure your stylesheets to automatically adjust the size, style, or layout of content when elements switch back and forth between full-screen and traditional presentations.</p>
+
+<h2 id="Examples">Examples</h2>
+
+<p>In this example, the color of a button is changed depending on whether or not the document is in full-screen mode. This is done without needing to specifically apply style changes using JavaScript.</p>
+
+<h3 id="HTML">HTML</h3>
+
+<p>The page's HTML looks like this:</p>
+
+<pre class="brush: html notranslate">&lt;h1&gt;MDN Web Docs Demo: :fullscreen pseudo-class&lt;/h1&gt;
+
+&lt;p&gt;This demo uses the &lt;code&gt;:fullscreen&lt;/code&gt; pseudo-class to automatically
+  change the style of a button used to toggle full-screen mode on and off,
+  entirely using CSS.&lt;/p&gt;
+
+&lt;button id="fs-toggle"&gt;Toggle Fullscreen&lt;/button&gt;</pre>
+
+<p>The {{HTMLElement("button")}} with the ID <code>"fs-toggle"</code> will change between pale red and pale green depending on whether or not the document is in full-screen mode.</p>
+
+<h3 id="CSS">CSS</h3>
+
+<p>The magic happens in the CSS. There are two rules here. The first establishes the background color of the "Toggle Full-screen Mode" button when the element is not in a full-screen state. The key is the use of the <code>:not(:fullscreen)</code>, which looks for the element to not have the <code>:fullscreen</code> pseudo-class applied to it.</p>
+
+<pre class="brush: css notranslate">#fs-toggle:not(:fullscreen) {
+  background-color: #afa;
+}
+</pre>
+
+<p>When the document <em>is</em> in full-screen mode, the following CSS applies instead, setting the background color to a pale shade of red.</p>
+
+<pre class="brush: css notranslate">#fs-toggle:fullscreen {
+  background-color: #faa;
+}</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">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('Fullscreen', '#:fullscreen-pseudo-class', ':fullscreen')}}</td>
+   <td>{{Spec2('Fullscreen')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+
+
+<p>{{Compat("css.selectors.fullscreen")}}</p>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/Fullscreen_API">Fullscreen API </a></li>
+ <li><a href="/en-US/docs/Web/API/Fullscreen_API/Guide">Guide to the Fullscreen API</a></li>
+ <li>{{cssxref(":not")}}</li>
+ <li>{{cssxref("::backdrop")}}</li>
+ <li>DOM API: {{ domxref("Element.requestFullscreen()") }}, {{ domxref("Document.exitFullscreen()") }}, {{ domxref("Document.fullscreenElement") }}</li>
+ <li>{{HTMLAttrXRef("allowfullscreen", "iframe")}} attribute</li>
+</ul>
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