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+---
+title: 虛擬類別
+slug: Web/CSS/Pseudo-classes
+translation_of: Web/CSS/Pseudo-classes
+---
+<p>{{ CSSRef() }}</p>
+
+<p>CSS <strong><em><dfn>虛擬類別（pseudo-class）</dfn></em></strong>的元素，在特殊狀態下被選取的話，會作為關鍵字被加到選擇器裡面。例如 {{ Cssxref(":hover") }} 會讓用戶的滑鼠停在某個元素的時候，套用指定選擇器的樣式。</p>
+
+<p>虛擬類別與 {{ Cssxref("pseudo-elements") }} 能讓你不只能給文件樹（document tree）本身的相關內容套用樣式，還能給諸如瀏覽歷史（{{ cssxref(":visited") }}）、內容的狀態（{{ cssxref(":checked") }}）、還有滑鼠的位置（像 {{ cssxref(":hover") }} 就能讓偵測滑鼠是否在元件上）之類的外部相關因素套用樣式。</p>
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox">selector:pseudo-class {
+  property: value;
+}
+</pre>
+
+<h2 id="基本虛擬類別的目錄">基本虛擬類別的目錄</h2>
+
+<div class="index">
+<ul>
+ <li>{{ Cssxref(":active") }}</li>
+ <li>{{ cssxref(':any')}}</li>
+ <li>{{ Cssxref(":checked") }}</li>
+ <li>{{ Cssxref(":default") }}</li>
+ <li>{{ Cssxref(":dir", ":dir()")}}</li>
+ <li>{{ Cssxref(":disabled") }}</li>
+ <li>{{ Cssxref(":empty") }}</li>
+ <li>{{ Cssxref(":enabled") }}</li>
+ <li>{{ Cssxref(":first") }}</li>
+ <li>{{ Cssxref(":first-child") }}</li>
+ <li>{{ Cssxref(":first-of-type") }}</li>
+ <li>{{ Cssxref(":fullscreen") }}</li>
+ <li>{{ Cssxref(":focus") }}</li>
+ <li>{{ Cssxref(":hover") }}</li>
+ <li>{{ Cssxref(":indeterminate") }}</li>
+ <li>{{ Cssxref(":in-range") }}</li>
+ <li>{{ Cssxref(":invalid") }}</li>
+ <li>{{ Cssxref(":lang", ":lang()") }}</li>
+ <li>{{ Cssxref(":last-child") }}</li>
+ <li>{{ Cssxref(":last-of-type") }}</li>
+ <li>{{ Cssxref(":left") }}</li>
+ <li>{{ Cssxref(":link") }}</li>
+ <li>{{ Cssxref(":not", ":not()") }}</li>
+ <li>{{ Cssxref(":nth-child", ":nth-child()") }}</li>
+ <li>{{ Cssxref(":nth-last-child", ":nth-last-child()") }}</li>
+ <li>{{ Cssxref(":nth-last-of-type", ":nth-last-of-type()") }}</li>
+ <li>{{ Cssxref(":nth-of-type", ":nth-of-type()") }}</li>
+ <li>{{ Cssxref(":only-child") }}</li>
+ <li>{{ Cssxref(":only-of-type") }}</li>
+ <li>{{ Cssxref(":optional") }}</li>
+ <li>{{ Cssxref(":out-of-range") }}</li>
+ <li>{{ Cssxref(":read-only") }}</li>
+ <li>{{ Cssxref(":read-write") }}</li>
+ <li>{{ Cssxref(":required") }}</li>
+ <li>{{ Cssxref(":right") }}</li>
+ <li>{{ Cssxref(":root") }}</li>
+ <li>{{ Cssxref(":scope") }}</li>
+ <li>{{ Cssxref(":target") }}</li>
+ <li>{{ Cssxref(":valid") }}</li>
+ <li>{{ Cssxref(":visited") }}</li>
+</ul>
+</div>
+
+<h2 id="規範"><span>規範</span></h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">規範</th>
+   <th scope="col">狀態</th>
+   <th scope="col">註解</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{ SpecName('Fullscreen') }}</td>
+   <td>{{ Spec2('Fullscreen') }}</td>
+   <td>定義 <code>:fullscreen</code>。</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('HTML WHATWG') }}</td>
+   <td>{{ Spec2('HTML WHATWG') }}</td>
+   <td>在 {{ SpecName('HTML5 W3C') }} 並沒有改變。</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS4 Selectors')}}</td>
+   <td>{{Spec2('CSS4 Selectors')}}</td>
+   <td>定義 <code>:any-link</code>, <code>:local-link</code>, <code>:scope</code>, <code>:active-drop-target</code>, <code>:valid-drop-target</code>, <code>:invalid-drop-target</code>, <code>:current</code>, <code>:past</code>, <code>:future</code>, <code>:placeholder-shown</code>, <code>:user-error</code>, <code>:blank</code>, <code>:nth-match()</code>, <code>:nth-last-match()</code>, <code>:nth-column()</code>, <code>:nth-last-column()</code>, and <code>:matches()</code>.<br>
+    沒有針對 {{SpecName('CSS3 Selectors')}} 與 {{SpecName('HTML5 W3C')}} 虛擬類別的重大更改（though semantic meaning not taken over）</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('HTML5 W3C') }}</td>
+   <td>{{ Spec2('HTML5 W3C') }}</td>
+   <td>定義以下 HTML context 的語意含義： <code>:link</code>, <code>:visited</code>, <code>:active</code>, <code>:enabled</code>, <code>:disabled</code>, <code>:checked</code>, and <code>:indeterminate</code>.<br>
+    <code>定義 :default</code>, <code>:valid</code>, <code>:invalid</code>, <code>:in-range</code>, <code>:out-of-range</code>, <code>:required</code>, <code>:optional</code>, <code>:read-only</code>, <code>:read-write</code>, and <code>:dir()</code>.</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('CSS3 Basic UI') }}</td>
+   <td>{{ Spec2('CSS3 Basic UI') }}</td>
+   <td>定義 <code>:default</code>, <code>:valid</code>, <code>:invalid</code>, <code>:in-range</code>, <code>:out-of-range</code>, <code>:required</code>, <code>:optional</code>, <code>:read-only</code>, <code>:read-write</code>，但沒有語意含義的定義。</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS3 Selectors')}}</td>
+   <td>{{Spec2('CSS3 Selectors')}}</td>
+   <td>定義 <code>:target</code>, <code>:root</code>, <code>:nth-child()</code>, <code>:nth-last-of-child()</code>, <code>:nth-of-type()</code>, <code>:nth-last-of-type()</code>, <code>:last-child</code>, <code>:first-of-type</code>, <code>:last-of-type</code>, <code>:only-child</code>, <code>:only-of-type</code>, <code>:empty</code>, <code>:not()</code>.<br>
+    定義 <code>:enabled</code>, <code>:disabled</code>, <code>:checked</code>, <code>:indeterminate</code> 的語法，但沒有語意含義的定義。<br>
+    在 {{SpecName('CSS2.1')}} 並沒有明顯改變。</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS2.1')}}</td>
+   <td>{{Spec2('CSS2.1')}}</td>
+   <td>定義 <code>:lang()</code>, <code>:first-child</code>, <code>:hover</code>, <code>:focus</code>.<br>
+    在 {{SpecName('CSS1')}} 並沒有明顯改變。</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS1')}}</td>
+   <td>{{Spec2('CSS1')}}</td>
+   <td>定義 <code>:link</code>, <code>:visited</code>, <code>:active</code>，但沒有語意含義的定義。</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="參閱">參閱</h2>
+
+<ul>
+ <li>{{ Cssxref("pseudo-elements") }}</li>
+</ul>