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---
title: ':placeholder-shown'
slug: 'Web/CSS/:placeholder-shown'
translation_of: 'Web/CSS/:placeholder-shown'
---
<div>{{CSSRef}}{{SeeCompatTable}}</div>
<p><strong><code>:placeholder-shown</code></strong> <a href="/en-US/docs/Web/CSS">CSS</a> <a href="/zh-CN/docs/CSS/Pseudo-classes">伪类</a> 在 {{htmlElement("input")}} 或 {{htmlElement("textarea")}} 元素显示 <a href="/en-US/docs/Web/HTML/Element/input#attr-placeholder">placeholder text</a> 时生效.</p>
<pre class="brush: css no-line-numbers">/* 选择所有显示占位符(placeholder)的元素 */
:placeholder-shown {
border: 2px solid silver;
}</pre>
<h2 id="参数">参数</h2>
<pre class="syntaxbox">:placeholder-shown</pre>
<h2 id="样例">样例</h2>
<h3 id="基础样例">基础样例</h3>
<h4 id="HTML">HTML</h4>
<pre class="brush: html"><input placeholder="Type something here!"></pre>
<h4 id="CSS">CSS</h4>
<pre class="brush: css; highlight[6]">input {
border: 2px solid black;
padding: 3px;
}
input:placeholder-shown {
border-color: silver;
}</pre>
<h4 id="结果">结果</h4>
<p>{{EmbedLiveSample('Basic_example', 200, 60)}}</p>
<h3 id="超出文本">超出文本</h3>
<p>在分辨率较小的设备上, 输入框或者其他表单控件可能会变的很窄. 这个选择器可以使得占位符文本缩短. 这个选择器经常和 {{cssxref("text-overflow")}} 一起使用.</p>
<h4 id="HTML_2">HTML</h4>
<pre class="brush: html"><input placeholder="Enter something into this field, if you please!"></pre>
<h4 id="CSS_2">CSS</h4>
<pre class="brush: css">input:placeholder-shown {
text-overflow: ellipsis;
}</pre>
<h4 id="结果_2">结果</h4>
<p>{{EmbedLiveSample("Overflowing_text", 200, 60)}}</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", "#placeholder", ":placeholder-shown")}}</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.placeholder-shown")}}</p>
<h2 id="参见">参见</h2>
<ul>
<li>The {{cssxref("::placeholder")}} pseudo-element styles the placeholder <em>itself</em>.</li>
<li>Related HTML elements: {{HTMLElement("input")}}, {{HTMLElement("textarea")}}</li>
<li>{{cssxref(":-moz-placeholder")}}, {{cssxref("::-moz-placeholder")}}</li>
<li><a href="/en-US/docs/Learn/HTML/Forms">HTML forms</a></li>
</ul>
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