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+---
+title: ':first-child'
+slug: 'Web/CSS/:first-child'
+translation_of: 'Web/CSS/:first-child'
+---
+<div>{{CSSRef}}</div>
+
+<p><strong><code>:first-child</code></strong> <a href="/en-US/docs/Web/CSS">CSS</a> <a href="/en-US/docs/Web/CSS/Pseudo-classes">pseudo-class</a> 表示在一组兄弟元素中的第一个元素。</p>
+
+<pre class="brush: css no-line-numbers">/* Selects any &lt;p&gt; that is the first element
+   among its siblings */
+p:first-child {
+  color: lime;
+}</pre>
+
+<div class="note">
+<p><strong>Note</strong>: 最初定义时，所选元素必须有一个parent。而从选择器 Level 4 开始，parent不再是必须的。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">{{csssyntax}}
+</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Basic_example">Basic example</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;div&gt;
+  &lt;p&gt;This text is selected!&lt;/p&gt;
+  &lt;p&gt;This text isn't selected.&lt;/p&gt;
+&lt;/div&gt;
+
+&lt;div&gt;
+  &lt;h2&gt;This text isn't selected: it's not a `p`.&lt;/h2&gt;
+  &lt;p&gt;This text isn't selected.&lt;/p&gt;
+&lt;/div&gt;
+</pre>
+
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css">p:first-child {
+  color: lime;
+  background-color: black;
+  padding: 5px;
+}
+</pre>
+
+<h4 id="Result">Result</h4>
+
+<p><span>{{EmbedLiveSample('Basic_example', 500, 200)}}</span></p>
+
+<h3 id="Styling_a_list">Styling a list</h3>
+
+<h4 id="HTML_2">HTML</h4>
+
+<pre class="brush: html">&lt;ul&gt;
+  &lt;li&gt;Item 1&lt;/li&gt;
+  &lt;li&gt;Item 2&lt;/li&gt;
+  &lt;li&gt;Item 3
+    &lt;ul&gt;
+      &lt;li&gt;Item 3.1&lt;/li&gt;
+      &lt;li&gt;Item 3.2&lt;/li&gt;
+      &lt;li&gt;Item 3.3&lt;/li&gt;
+    &lt;/ul&gt;
+  &lt;/li&gt;
+&lt;/ul&gt;</pre>
+
+<h4 id="CSS_2">CSS</h4>
+
+<pre class="brush: css">ul li {
+  color: blue;
+}
+
+ul li:first-child {
+  color: red;
+  font-weight: bold;
+}</pre>
+
+<h4 id="Result_2">Result</h4>
+
+<p><span>{{EmbedLiveSample('Styling_a_list')}}</span></p>
+
+<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('CSS4 Selectors', '#first-child-pseudo', ':first-child')}}</td>
+   <td>{{Spec2('CSS4 Selectors')}}</td>
+   <td>Matching elements are not required to have a parent.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS3 Selectors', '#first-child-pseudo', ':first-child')}}</td>
+   <td>{{Spec2('CSS3 Selectors')}}</td>
+   <td>No change.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS2.1', 'selector.html#first-child', ':first-child')}}</td>
+   <td>{{Spec2('CSS2.1')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+
+
+<p>{{Compat("css.selectors.first-child")}}</p>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{cssxref(":first-of-type")}}, {{cssxref(":last-child")}}, {{cssxref(":nth-child")}}</li>
+</ul>