---
title: ':only-child'
slug: 'Web/CSS/:only-child'
tags:
  - CSS
  - Layout
  - Pseudo-class
  - Reference
  - Web
translation_of: 'Web/CSS/:only-child'
---
<div>{{CSSRef}}</div>

<p>La <a href="/en-US/docs/CSS/Pseudo-classes" title="Pseudo classes">pseudo-class </a><a href="https://developer.mozilla.org/en-US/docs/Web/CSS">CSS</a> <strong><code>:only-child</code></strong> representa un element sense germans. És el mateix que <code>:first-child:last-child</code> o <code>:nth-child(1):nth-last-child(1)</code>, però amb una menor especificitat.</p>

<pre class="brush: css no-line-numbers">/* <span id="result_box" lang="ca"><span>Selecciona cada &lt;p&gt;, però només si és l'únic fill del seu pare</span></span> */
p:only-child {
  background-color: lime;
}</pre>

<div class="note">
<p><strong>Nota</strong>: Com es va definir originalment, l'element seleccionat havia de tenir un pare. A partir dels Selectores Nivell 4, això ja no és necessari.</p>
</div>

<h2 id="Sintaxi">Sintaxi</h2>

<pre class="syntaxbox">{{csssyntax}}
</pre>

<h2 id="Exemples">Exemples</h2>

<h3 id="Exemple_bàsic">Exemple bàsic</h3>

<h4 id="HTML">HTML</h4>

<pre class="brush: html">&lt;main&gt;
  &lt;div&gt;
    &lt;i&gt;I am a lonely only child.&lt;/i&gt;
  &lt;/div&gt;

  &lt;div&gt;
    &lt;i&gt;I have siblings.&lt;/i&gt;&lt;br&gt;
    &lt;b&gt;So do I!&lt;/b&gt;&lt;br&gt;
    &lt;span&gt;I also have siblings, &lt;span&gt;but this is an only child.&lt;/span&gt;&lt;/span&gt;
  &lt;/div&gt;
&lt;/main&gt;</pre>

<h4 id="CSS">CSS</h4>

<pre class="brush: css">main :only-child {
  color: red;
}
</pre>

<h4 id="Resultat">Resultat</h4>

<p>{{EmbedLiveSample('Basic_example','100%',180)}}</p>

<h3 id="Un_exemple_de_llista"><span class="short_text" id="result_box" lang="ca"><span>Un exemple de llista</span></span></h3>

<h4 id="HTML_2">HTML</h4>

<pre class="brush: html">&lt;ol&gt;
  &lt;li&gt;First
    &lt;ul&gt;
      &lt;li&gt;This list has just one element.
    &lt;/ul&gt;
  &lt;/li&gt;
  &lt;li&gt;Second
    &lt;ul&gt;
      &lt;li&gt;This list has three elements.
      &lt;li&gt;This list has three elements.
      &lt;li&gt;This list has three elements.
    &lt;/ul&gt;
  &lt;/li&gt;
&lt;ol&gt;
</pre>

<h4 id="CSS_2">CSS</h4>

<pre class="brush: css">li li {
  list-style-type: disc;
}
li:only-child {
  color: red;
  list-style-type: square;
}</pre>

<h4 id="Resultat_2">Resultat</h4>

<p>{{EmbedLiveSample('A_list_example', '100%', 210)}}</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('CSS4 Selectors', '#only-child-pseudo', ':only-child')}}</td>
   <td>{{Spec2('CSS4 Selectors')}}</td>
   <td><span id="result_box" lang="ca"><span>No es requereix que els elements coincidents tinguin un pare.</span></span></td>
  </tr>
  <tr>
   <td>{{SpecName('CSS3 Selectors', '#only-child-pseudo', ':only-child')}}</td>
   <td>{{Spec2('CSS3 Selectors')}}</td>
   <td>Definició inicial.</td>
  </tr>
 </tbody>
</table>

<h2 id="Navegadors_compatibles">Navegadors compatibles</h2>

<div>{{CompatibilityTable}}</div>

<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>2</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop(1.8)}}</td>
   <td>9</td>
   <td>{{CompatOpera(9.5)}}</td>
   <td>3.1</td>
  </tr>
  <tr>
   <td>No es requereix cap pare</td>
   <td>{{CompatChrome(57)}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatOpera(44)}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Descripció</th>
   <th>Android Webview</th>
   <th>Chrome for 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>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoMobile(1.8)}}</td>
   <td>9</td>
   <td>{{CompatOperaMobile(10)}}</td>
   <td>3.1</td>
  </tr>
  <tr>
   <td>No es requereix cap pare</td>
   <td>{{CompatChrome(57)}}</td>
   <td>{{CompatChrome(57)}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatOperaMobile(44)}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="Vegeu_també">Vegeu també</h2>

<ul>
 <li>{{Cssxref(":only-of-type")}}</li>
 <li>{{Cssxref(":first-child")}}</li>
 <li>{{Cssxref(":last-child")}}</li>
 <li>{{Cssxref(":nth-child")}}</li>
</ul>