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+---
+title: ':root'
+slug: 'Web/CSS/:root'
+tags:
+  - CSS
+  - Layout
+  - NeedsMobileBrowserCompatibility
+  - Pseudo-class
+  - Reference
+  - Web
+translation_of: 'Web/CSS/:root'
+---
+<div>{{CSSRef}}</div>
+
+<p>La <a href="/en-US/docs/Web/CSS/Pseudo-classes"> pseudo-class</a> <a href="/en-US/docs/Web/CSS">CSS</a> <strong><code>:root</code></strong> coincideix amb l'element arrel de l'arbre que representa el document. En HTML, <code>:root</code> representa l'element {{HTMLElement("html")}} i és idèntic al selector <code>html</code>, excepte que la seva <a href="/en-US/docs/Web/CSS/specificity">Especificitat</a> és més alta.</p>
+
+<pre class="brush: css no-line-numbers">/*  <span id="result_box" lang="ca"><span>Selecciona l'element arrel del document: &lt;html&gt; en el cas de l'HTML</span></span> */
+:root {
+  background: yellow;
+}</pre>
+
+<h2 id="Sintaxi">Sintaxi</h2>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="Exemple">Exemple</h2>
+
+<p>El ùs de <code>:root</code> pot ser útil per declarar <a href="/en-US/docs/Web/CSS/Using_CSS_variables">Variables CSS</a> globals:</p>
+
+<pre class="brush: css">:root {
+  --main-color: hotpink;
+  --pane-padding: 5px 42px;
+}
+</pre>
+
+<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('CSS4 Selectors', '#root-pseudo', ':root')}}</td>
+   <td>{{Spec2('CSS4 Selectors')}}</td>
+   <td>Sense canvis.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS3 Selectors', '#root-pseudo', ':root')}}</td>
+   <td>{{Spec2('CSS3 Selectors')}}</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>1</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("1.7")}}</td>
+   <td>9</td>
+   <td>9.5</td>
+   <td>1.0</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>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>