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+---
+title: width
+slug: Web/CSS/width
+tags:
+  - CSS
+  - 参考
+  - 大小
+  - 宽度
+translation_of: Web/CSS/width
+---
+<div>{{CSSRef}}</div>
+
+<p><strong><code>width</code></strong> 属性用于设置元素的宽度。<code>width</code> 默认设置<a href="/en-US/docs/CSS/CSS_Box_Model/Introduction_to_the_CSS_box_model#content-area">内容区域</a>的宽度，但如果 {{cssxref("box-sizing")}} 属性被设置为 <code>border-box</code>，就转而设置<a href="/en-US/docs/Web/CSS/CSS_Box_Model/Introduction_to_the_CSS_box_model#border-area">边框区域</a>的宽度。</p>
+
+<div>{{EmbedInteractiveExample("pages/css/width.html")}}</div>
+
+<p class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>
+
+<p>{{ cssxref("min-width") }} 和 {{ cssxref("max-width") }} 属性的优先级高于 {{ cssxref("width") }}。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush:css no-line-numbers">/* &lt;length&gt; values */
+width: 300px;
+width: 25em;
+
+/* &lt;percentage&gt; value */
+width: 75%;
+
+/* Keyword values */
+width: max-content;
+width: min-content;
+width: fit-content(20em);
+width: auto;
+
+/* Global values */
+width: inherit;
+width: initial;
+width: unset;
+</pre>
+
+<p><code>width</code> 属性也指定为：</p>
+
+<ul>
+ <li>下面关键字值之一：<code><a href="https://wiki.developer.mozilla.org/zh-CN/docs/Web/CSS/width$edit#min-content">min-content</a></code>，<code><a href="https://wiki.developer.mozilla.org/zh-CN/docs/Web/CSS/width$edit#max-content">max-content</a></code>，<code><a href="https://wiki.developer.mozilla.org/zh-CN/docs/Web/CSS/width$edit#fit-content">fit-content</a></code>，<code><a href="https://wiki.developer.mozilla.org/zh-CN/docs/Web/CSS/width$edit#auto">auto</a></code>。</li>
+ <li>一个长度值 <code><a href="https://wiki.developer.mozilla.org/zh-CN/docs/Web/CSS/width$edit#%3Clength%3E">&lt;length&gt;</a></code> 或者百分比值 <code><a href="https://wiki.developer.mozilla.org/zh-CN/docs/Web/CSS/width$edit#%3Cpercentage%3E">&lt;percentage&gt;</a></code>。</li>
+</ul>
+
+<h3 id="值">值</h3>
+
+<dl>
+ <dt>{{cssxref("&lt;length&gt;")}}</dt>
+ <dd>使用绝对值定义宽度。</dd>
+ <dt>{{cssxref("&lt;percentage&gt;")}}</dt>
+ <dd>使用外层元素的容纳区块宽度（the containing block's width）的百分比定义宽度。</dd>
+ <dt><code>auto</code></dt>
+ <dd>浏览器将会为指定的元素计算并选择一个宽度。</dd>
+ <dt><code>max-content</code> {{ experimental_inline }}</dt>
+ <dd>元素内容固有的（intrinsic）合适宽度。</dd>
+ <dt><code>min-content</code> {{ experimental_inline }}</dt>
+ <dd>元素内容固有的最小宽度。</dd>
+ <dt><code>fit-content</code> {{ experimental_inline }}</dt>
+ <dd>取以下两种值中的较大值:
+ <ul>
+  <li>固有的最小宽度</li>
+  <li>固有首选宽度（max-content）和可用宽度（available）两者中的较小值</li>
+ </ul>
+ 可表示为：<code>min(max-content, max(min-content, &lt;length-percentage&gt;))</code></dd>
+</dl>
+
+<h3 id="形式化语法">形式化语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="默认宽度">默认宽度</h3>
+
+<pre class="brush:css">p.goldie {
+  background: gold;
+}</pre>
+
+<pre class="brush:html">&lt;p class="goldie"&gt;The Mozilla community produces a lot of great software.&lt;/p&gt;</pre>
+
+<p>{{EmbedLiveSample('Default_width', '500px', '64px')}}</p>
+
+<h3 id="像素_px_和字高_em">像素 px 和字高 em</h3>
+
+<pre class="brush: css">.px_length {
+  width: 200px;
+  background-color: red;
+  color: white;
+  border: 1px solid black;
+}
+
+.em_length {
+  width: 20em;
+  background-color: white;
+  color: red;
+  border: 1px solid black;
+}
+</pre>
+
+<pre class="brush: html">&lt;div class="px_length"&gt;以 px 度量的宽度&lt;/div&gt;
+&lt;div class="em_length"&gt;以 em 度量的宽度&lt;/div&gt;</pre>
+
+<p>{{EmbedLiveSample('Pixels_and_ems', '500px', '64px')}}</p>
+
+<h3 id="百分比">百分比</h3>
+
+<pre class="brush: css">.percent {
+  width: 20%;
+  background-color: silver;
+  border: 1px solid red;
+}</pre>
+
+<pre class="brush: html">&lt;div class="percent"&gt;按照百分比度量的宽度&lt;/div&gt;</pre>
+
+<p>{{EmbedLiveSample('百分比', '500px', '64px')}}</p>
+
+<h3 id="max-content"><code>max-content</code></h3>
+
+<pre class="brush:css;">p.maxgreen {
+  background: lightgreen;
+  width: intrinsic;           /* Safari/WebKit 使用了非标准的名称 */
+  width: -moz-max-content;    /* Firefox/Gecko */
+  width: -webkit-max-content; /* Chrome */
+}</pre>
+
+<pre class="brush:html">&lt;p class="maxgreen"&gt;The Mozilla community produces a lot of great software.&lt;/p&gt;</pre>
+
+<p>{{EmbedLiveSample('max-content', '500px', '64px')}}</p>
+
+<h3 id="min-content"><code>min-content</code></h3>
+
+<pre class="brush:css">p.minblue {
+  background: lightblue;
+  width: -moz-min-content;    /* Firefox */
+  width: -webkit-min-content; /* Chrome */
+}</pre>
+
+<pre class="brush:html">&lt;p class="minblue"&gt;The Mozilla community produces a lot of great software.&lt;/p&gt;</pre>
+
+<p>{{EmbedLiveSample('min-content', '500px', '155px')}}</p>
+
+<h2 id="无障碍考虑">无障碍考虑</h2>
+
+<p>当页面放大以增加文本大小时，请确保 <code>width</code> 设置的元素不会被截断并且不会遮挡其他内容。</p>
+
+<ul>
+ <li><a href="https://wiki.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-scale.html" rel="noopener">Understanding Success Criterion 1.4.4  | 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">注释</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{ SpecName('CSS3 Box', '#the-width-and-height-properties', 'width') }}</td>
+   <td>{{Spec2('CSS3 Box')}}</td>
+   <td>增加 <code>max-content</code>, <code>min-content</code>, <code>available</code>, <code>fit-content</code>, <code>border-box</code>, <code>content-box</code> 关键字。</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('CSS2.1', 'visudet.html#the-width-property', 'width') }}</td>
+   <td>{{Spec2('CSS2.1')}}</td>
+   <td>明确了此属性对哪些元素有效。</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('CSS1', '#width', 'width') }}</td>
+   <td>{{Spec2('CSS1')}}</td>
+   <td>初始定义。</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.width")}}</p>
+
+<div class="hidden">
+<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>
+</div>
+
+<h2 id="另请参见">另请参见</h2>
+
+<ul>
+ <li><a href="/zh-CN/docs/Web/CSS/CSS_Box_Model/Introduction_to_the_CSS_box_model">框盒模型</a></li>
+ <li>{{cssxref("height")}}</li>
+ <li>{{cssxref("box-sizing")}}</li>
+ <li>{{cssxref("min-width")}}</li>
+ <li>{{cssxref("max-width")}}</li>
+</ul>