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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:52 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:52 -0500
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parentda78a9e329e272dedb2400b79a3bdeebff387d47 (diff)
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+---
+title: ':root'
+slug: 'Web/CSS/:root'
+translation_of: 'Web/CSS/:root'
+---
+<div>{{CSSRef}}</div>
+
+<h2 id="Sumário">Sumário</h2>
+
+<p>A <a href="/en-US/docs/Web/CSS/Pseudo-classes">pseudo-classe CSS</a>  <strong><code>:root</code></strong> se equipara à raíz de uma árvore, que por sua vez representa o documento. Aplicado ao HTML, <code>:root</code> representa o elemento {{HTMLElement("html")}}  e é identico ao seletor html, exceto que sua <a href="https://wiki.developer.mozilla.org/pt-BR/docs/Web/CSS/Specificity">especificidade</a> é mais alta.</p>
+
+<h2 id="Sintaxe">Sintaxe</h2>
+
+<pre class="syntaxbox notranslate">{{csssyntax}}</pre>
+
+<h2 id="Exemplo">Exemplo</h2>
+
+<p>Usar <code>:root</code> pode ser útil para declarar uma <a href="/en-US/docs/Web/CSS/Using_CSS_variables">variável CSS</a> global:</p>
+
+<pre class="brush: css notranslate">:root {
+ --main-color: hotpink;
+ --pane-padding: 5px 42px;
+}
+</pre>
+
+<h2 id="Especificações">Especificações</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">Especificação</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comentário</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('CSS4 Selectors', '#root-pseudo', ':root')}}</td>
+ <td>{{Spec2('CSS4 Selectors')}}</td>
+ <td>Sem mudança</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('CSS3 Selectors', '#root-pseudo', ':root')}}</td>
+ <td>{{Spec2('CSS3 Selectors')}}</td>
+ <td>Definição inicial</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilidade_dos_Navegadores">Compatibilidade dos Navegadores</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<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</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>1</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>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>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>