---
title: letter-spacing
slug: Web/CSS/letter-spacing
tags:
  - CSS
  - SVG
  - 参考文档
translation_of: Web/CSS/letter-spacing
---
<div>{{CSSRef}}</div>

<p><code>CSS</code> 的 <code>letter-spacing</code> 属性用于设置文本字符的间距表现。</p>

<div>{{EmbedInteractiveExample("pages/css/letter-spacing.html")}}</div>



<h2 id="语法">语法</h2>

<pre class="brush:css">/* Keyword value */
letter-spacing: normal;

/* &lt;length&gt; values */
letter-spacing: 0.3em;
letter-spacing: 3px;
letter-spacing: .3px;

/* Global values */
letter-spacing: inherit;
letter-spacing: initial;
letter-spacing: unset;
</pre>

<h3 id="值">值</h3>

<dl>
 <dt><code>normal</code></dt>
 <dd>此间距是按照当前字体的正常间距确定的。和 <code>0</code> 不同的是，{{glossary("user agent", "用户代理")}}根据此属性来确定文字的默认对齐方式。</dd>
 <dt>{{cssxref("&lt;length&gt;")}}</dt>
 <dd>指定文字间的间距以替代默认间距。可以是负值，但有可能会出现 implementation 限制。用户代理不会在此基础上进一步增加或缩减间距来对齐文字。</dd>
</dl>

<h3 id="形式语法">形式语法</h3>

{{csssyntax}}

<h2 id="示例">示例</h2>

<h3 id="HTML">HTML</h3>

<pre class="brush: html">&lt;p class="normal"&gt;letter spacing&lt;/p&gt;
&lt;p class="em-wide"&gt;letter spacing&lt;/p&gt;
&lt;p class="em-wider"&gt;letter spacing&lt;/p&gt;
&lt;p class="em-tight"&gt;letter spacing&lt;/p&gt;
&lt;p class="px-wide"&gt;letter spacing&lt;/p&gt;
</pre>

<h3 id="CSS">CSS</h3>

<pre class="brush: css">.normal   { letter-spacing: normal; }
.em-wide  { letter-spacing: 0.4em; }
.em-wider { letter-spacing: 1em; }
.em-tight { letter-spacing: -0.05em; }
.px-wide  { letter-spacing: 6px; }
</pre>

<h3 id="结果">结果</h3>

<p>{{ EmbedLiveSample('Examples', 440, 185) }}</p>

<h2 id="可解决的问题">可解决的问题</h2>

<p>一个很大的正或负的 <code>letter-spacing</code>值会将应用这个样式的单词变为不可读的。给文本 <code>letter-spacing</code> 属性应用了一个很大的正值，字母之间的距离会很远，以至于文本中的单词将显示为一系列单独的，无有任何关联的字母。给文本 <code>letter-spacing</code> 属性应用了一个很大的负值，字母将会互相重叠到一个点，在这个点上单词可能无法识别了。</p>

<p>最佳的易辨认的字母间距（letter-spacing）必须根据具体情况来确定，因为不同的字体系列具有不同的字符宽度。没有任何一个值可以确保所有字体系列自动保持它们的可读性。</p>

<h2 id="可访问性考量">可访问性考量</h2>

<p>A large positive or negative <code>letter-spacing</code> value will make the word(s) the styling is applied to unreadable. For text styled with a very large positive value, the letters will be so far apart that the word(s) will appear like a series of individual, unconnected letters. For text styled with a very large negative value, the letters will overlap each other to the point where the word(s) may be unrecognizable.</p>

<p>Legible letter-spacing must be determined on a case-by-case basis, as different font families have different character widths. There is no one value that can ensure all font families automatically maintain their legibility.</p>

<ul>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/Accessibility/Understanding_WCAG/Perceivable#Guideline_1.4_Make_it_easier_for_users_to_see_and_hear_content_including_separating_foreground_from_background">MDN Understanding WCAG, Guideline 1.4 explanations</a></li>
 <li><a href="https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-visual-presentation.html" rel="noopener">Understanding Success Criterion 1.4.8 | W3C Understanding WCAG 2.0</a></li>
</ul>

<h2 id="规范">规范</h2>

<table class="standard-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('CSS3 Text', '#letter-spacing-property', 'letter-spacing')}}</td>
   <td>{{Spec2('CSS3 Text')}}</td>
   <td>没有变化</td>
  </tr>
  <tr>
   <td>{{SpecName('CSS3 Transitions', '#animatable-css', 'letter-spacing')}}</td>
   <td>{{Spec2('CSS3 Transitions')}}</td>
   <td>定义可动的间距</td>
  </tr>
  <tr>
   <td>{{SpecName('CSS2.1', 'text.html#propdef-letter-spacing', 'letter-spacing')}}</td>
   <td>{{Spec2('CSS2.1')}}</td>
   <td>没有变化</td>
  </tr>
  <tr>
   <td>{{SpecName('SVG1.1', 'text.html#LetterSpacingProperty', 'letter-spacing')}}</td>
   <td>{{Spec2('SVG1.1')}}</td>
   <td>初始化 SVG</td>
  </tr>
  <tr>
   <td>{{SpecName('CSS1', '#letter-spacing', 'letter-spacing')}}</td>
   <td>{{Spec2('CSS1')}}</td>
   <td>Initial specification</td>
  </tr>
 </tbody>
</table>

<p>{{cssinfo}}</p>

<h2 id="浏览器兼容性">浏览器兼容性</h2>



<p>{{Compat("css.properties.letter-spacing")}}</p>

<h2 id="参见">参见</h2>

<ul>
 <li>{{cssxref("font-kerning")}}</li>
</ul>