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+---
+title: ':invalid'
+slug: 'Web/CSS/:invalid'
+translation_of: 'Web/CSS/:invalid'
+---
+<p> </p>
+
+<p>{{CSSRef}}</p>
+
+<p><strong><code>:invalid</code></strong> <a href="https://developer.mozilla.org/en-US/docs/Web/CSS">CSS</a> <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Pseudo-classes">伪类</a> 表示任意内容未通过验证的 {{HTMLElement("input")}} 或其他 {{HTMLElement("form")}} 元素 .</p>
+
+<pre><code>/* 可选定任意无效的&lt;input&gt; */
+input:invalid {
+  background-color: pink;
+}</code></pre>
+
+<p>这个伪类对于突出显示用户的字段错误非常有用。</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre>:invalid
+</pre>
+
+<h2 id="Example">Example</h2>
+
+<p>以下示例是一个简单的表单，当值有效时，元素颜色为绿色，无效时为红色。</p>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;form&gt;
+  &lt;label for="url_input"&gt;Enter a URL:&lt;/label&gt;
+  &lt;input type="url" id="url_input" /&gt;
+  &lt;br /&gt;
+  &lt;br /&gt;
+  &lt;label for="email_input"&gt;Enter an email address:&lt;/label&gt;
+  &lt;input type="email" id="email_input" required/&gt;
+&lt;/form&gt;</pre>
+
+<h3 id="CSS">CSS</h3>
+
+<pre class="brush: css">input:invalid {
+  background-color: #ffdddd;
+}
+
+form:invalid {
+  border: 5px solid #ffdddd;
+}
+
+input:valid {
+  background-color: #ddffdd;
+}
+
+form:valid {
+  border: 5px solid #ddffdd;
+}
+
+input:required {
+  border-color: #800000;
+  border-width: 3px;
+}
+
+input:required:invalid {
+  border-color: #C00000;
+}</pre>
+
+<h3 id="Result">Result</h3>
+
+<p>{{EmbedLiveSample('Example', 600, 120)}}</p>
+
+<h2 id="注意">注意</h2>
+
+<h3 id="单选钮（Radio_buttons）">单选钮（Radio buttons）</h3>
+
+<p>若一组单选钮被设定为必须选定一个，在该组中没有按钮被选中的情况，:invalid伪类被应用到该组中的所有按钮。（单选钮组按照name属性共享相同值。）</p>
+
+<h3 id="Gecko_默认">Gecko 默认</h3>
+
+<p>默认情况下，Gecko不应用:invalid伪类设置的样式。但是，Gecko可以使用{{cssxref(":-moz-ui-invalid")}}伪类的样式（使用{{Cssxref("box-shadow")}} 属性设置红色发光边框）来达到类似的效果，它可以被应用在:invalid伪类的子集中。</p>
+
+<p>你可以使用以下CSS禁用红色发光边框,或完全重写它以改变无效输入域的外观：</p>
+
+<pre><code>:invalid {
+  box-shadow: none;
+}
+
+:-moz-submit-invalid {
+  box-shadow: none;
+}
+
+:-moz-ui-invalid {
+  box-shadow: none;
+}</code></pre>
+
+<h2 id="规范">规范</h2>
+
+<table>
+ <thead>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">备注</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', '#selector-invalid', ':invalid')}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>No change.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5 W3C', '#selector-invalid', ':invalid')}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td>Defines the semantics of HTML and constraint validation.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS4 Selectors', '#validity-pseudos', ':invalid')}}</td>
+   <td>{{Spec2('CSS4 Selectors')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("css.selectors.invalid")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>Other validation-related pseudo-classes: {{ cssxref(":required") }}, {{ cssxref(":optional") }}, {{ cssxref(":valid") }}</li>
+ <li>Related Mozilla pseudo-classes: {{cssxref(":-moz-ui-invalid")}}, {{cssxref(":-moz-submit-invalid")}}</li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Form_validation">Form data validation</a></li>
+</ul>