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+---
+title: '::backdrop'
+slug: 'Web/CSS/::backdrop'
+tags:
+  - CSS
+  - Full-screen
+  - Layout
+  - NeedsContent
+  - Pseudo-element
+  - Reference
+translation_of: 'Web/CSS/::backdrop'
+---
+<div>{{CSSRef}} {{SeeCompatTable}}</div>
+
+<p>El {{Cssxref("pseudo-elements", "pseudo-element")}} <a href="https://developer.mozilla.org/en-US/docs/Web/CSS">CSS</a>  <strong><code>::backdrop</code></strong> és una caixa situada immediatament per sota d'un element visualitzat en mode de <a href="/en-US/docs/Web/API/Fullscreen_API">pantalla completa</a>  (i per sobre de qualsevol element inferior de la pila). Els elements de pantalla completa formen part de la pila de la <a href="https://fullscreen.spec.whatwg.org/#top-layer">capa superior</a>, és a dir, es representen davant de qualsevol altre contingut.</p>
+
+<pre class="brush: css no-line-numbers">dialog::backdrop {
+  background: rgba(255,0,0,.25);
+}</pre>
+
+<p>El pseudo-element <code>::backdrop</code> es pot utilitzar per donar estil o ocultar el document subjacent d'un element que es mostra a pantalla completa.</p>
+
+<p><code>::backdrop</code> no hereta de cap element i no és hereditari. No es fa cap restricció sobre quines propietats s'apliquen a aquest pseudo-element.</p>
+
+<h2 id="Especificacions">Especificacions</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Especificació</th>
+   <th scope="col">Estat</th>
+   <th scope="col">Comentari</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('Fullscreen', '#::backdrop-pseudo-element', '::backdrop')}}</td>
+   <td>{{Spec2('Fullscreen')}}</td>
+   <td>Definició inicial.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Navegadors_compatibles">Navegadors compatibles</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Descripció</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</td>
+   <td>32.0 {{property_prefix("webkit")}}<br>
+    37.0</td>
+   <td>{{CompatVersionUnknown}}{{property_prefix("ms")}}</td>
+   <td>{{CompatGeckoDesktop("47")}} <sup>[1]</sup></td>
+   <td>11 {{property_prefix("ms")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td>en <code>&lt;dialog&gt;</code></td>
+   <td>32.0 {{property_prefix("webkit")}}<br>
+    37.0</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td>en fullscreen</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}{{property_prefix("ms")}}</td>
+   <td>{{CompatGeckoDesktop("47")}} <sup>[1]</sup></td>
+   <td>11 {{property_prefix("ms")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Descripció</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}{{property_prefix("ms")}}</td>
+   <td>{{CompatGeckoMobile("47")}} <sup>[1]</sup></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td>en <code>&lt;dialog&gt;</code></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td>en fullscreen</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}{{property_prefix("ms")}}</td>
+   <td>{{CompatGeckoMobile("47")}} <sup>[1]</sup></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] See {{bug(1064843)}}</p>
+
+<h2 id="Vegeu_també">Vegeu també</h2>
+
+<ul>
+ <li>{{cssxref(":fullscreen")}}</li>
+ <li>{{HTMLElement("dialog")}}</li>
+</ul>