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---
title: ':blank'
slug: 'Web/CSS/:-moz-only-whitespace'
translation_of: 'Web/CSS/:-moz-only-whitespace'
---
<div>{{CSSRef}}{{SeeCompatTable}}</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">伪类选择器</a> 用于匹配如下节点</p>
<p>1. 没有子节点;</p>
<p>2. 仅有空的文本节点;</p>
<p>3. 仅有空白符的文本节点.</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">{{CSSSyntax}}</pre>
<h2 id="样例">样例</h2>
<h3 id="HTML">HTML</h3>
<pre class="brush: html;"><div> </div>
</pre>
<h3 id="CSS">CSS</h3>
<div class="hidden">
<pre class="brush: css;">:root {
overflow: hidden;
max-width: 100vw;
max-height: 100vh;
}
div {
background-color: #ccc;
box-sizing: border-box;
height: 100vh;
min-height: 16px;
min-height: 1rem;
}
:-moz-only-whitespace {
border-color: lime;
}</pre>
</div>
<pre class="brush: css;">div {
border: 4px solid red;
}
:blank {
border-color: lime;
}</pre>
<h3 id="结果">结果</h3>
<p>{{EmbedLiveSample("Example", "100%", "50")}}</p>
<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>
<p>{{Compat("css.selectors.blank")}}</p>
<h2 id="参考">参考</h2>
<ul>
<li>{{CSSxRef(":empty")}}</li>
</ul>
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