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---
title: ':blank'
slug: Web/CSS/:blank
tags:
- CSS
- CSS 选择器
- 伪类
translation_of: Web/CSS/:blank
original_slug: Web/CSS/:blank空白伪类
---
<p>{{CSSRef}}{{Draft}}{{SeeCompatTable}}</p>
<div class="blockIndicator note">
<p><strong>注意：</strong>使用 <code>:blank</code> 选择器被认为尚有一定风险，CSSWG 正在持续改进它。</p>
<p>详见<a href="https://github.com/w3c/csswg-drafts/issues/1967" title="[selectors] decide on :blank"> CSSWG issue #1967</a>。</p>
</div>
<p><strong><code>:blank</code></strong> <a href="/en-US/docs/Web/CSS">CSS</a> <a href="/zh-CN/docs/Web/CSS/Pseudo-classes">伪类</a>选择器选择用户输入为空的输入框，如 {{HTMLElement("input")}} 和 {{HTMLElement("textarea")}})。</p>
<h2 id="语法">语法</h2>
{{CSSSyntax}}
<h2 id="规范">规范</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", "#blank-pseudo", ":blank")}}</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>
<div class="hidden">如果你想得到更多信息，请查看：<a href="https://www.w3.org/TR/selectors-4/#blank-pseudo">https://www.w3.org/TR/selectors-4/#blank-pseudo</a></div>
<p>{{Compat("css.selectors.blank")}}</p>
<h2 id="参见">参见</h2>
<ul>
<li>{{CSSxRef(":empty")}}</li>
<li>{{CSSxRef(":-moz-only-whitespace")}} {{Non-standard_Inline}} - The previous definition of <code>:blank</code>.</li>
</ul>
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