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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: margin-right
+slug: Web/CSS/margin-right
+tags:
+ - CSS
+ - CSS 属性
+translation_of: Web/CSS/margin-right
+---
+<p>{{CSSRef}}</p>
+
+<h2 id="Summary" name="Summary">摘要</h2>
+
+<p><img alt="The effect of the CSS margin-right property on the element box" src="/files/4041/margin-right.svg" style="border: solid 1px; float: left; height: 200px; margin-bottom: 1em; margin-right: 1em; width: 400px;"><strong><code>margin-right</code></strong>  属性 设置与元素相关联的盒子模型的右外边距。这个值可以为负值。</p>
+
+<p><span class="seoSummary">竖直排列相邻的两个盒子模型的外边距会重叠,称为 <a href="https://developer.mozilla.org/en-US/docs/CSS/margin_collapsing" title="/en-US/docs/CSS/margin_collapsing"><em>margin collapsing</em></a>.</span></p>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="brush:css">/* &lt;length&gt; values */
+margin-right: 20px; /* An absolute length */
+margin-right: 1em; /* A length relative to the text size */
+margin-right: 5%; /* A margin relative to the nearest block container's width */
+
+/* Keyword values */
+margin-right: auto;
+
+/* Global values */
+margin-right: inherit;
+margin-right: initial;
+margin-right: unset;
+</pre>
+
+<h3 id="Values" name="Values">值</h3>
+
+<dl>
+ <dt><code>&lt;length&gt;</code></dt>
+ <dd>一个固定宽度 {{cssxref("&lt;length&gt;")}}值: 可以是一个绝对宽度,e.g. in <code>px</code>, 也可以是一个相对宽度, e.g. in <code>em</code>, 或者相对视窗的大小,e.g. in <code>vh</code>.</dd>
+ <dt><code>&lt;percentage&gt;</code></dt>
+ <dd>以百分比为单位的margin值,计算时是相对于其最近的父级容器的宽度。</dd>
+ <dt><code>auto</code></dt>
+ <dd>auto关键词表示在当前布局模式下,浏览器根据接收的左边距自动计算出外边距。如果有几组margin-left和margin-right 设置为auto,那么最后计算的空间分布,会根据display,float,position属性,自动生成以下几种情况:
+ <table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">Value of {{cssxref("display")}}</th>
+ <th scope="col">Value of {{cssxref("float")}}</th>
+ <th scope="col">Value of {{cssxref("position")}}</th>
+ <th scope="col">Computed value of <code>auto</code></th>
+ <th scope="col">Comment</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <th><code>inline</code>, <code>inline-block</code>, <code>inline-table</code></th>
+ <th><em>any</em></th>
+ <th><code>static</code> or <code>relative</code></th>
+ <td><code>0</code></td>
+ <td>Inline layout mode</td>
+ </tr>
+ <tr>
+ <th><code>block</code>, <code>inline</code>, <code>inline-block</code>, <code>block</code>, <code>table</code>, <code>inline-table</code>, <code>list-item</code>, <code>table-caption</code></th>
+ <th><em>any</em></th>
+ <th><code>static</code> or <code>relative</code></th>
+ <td><code>0</code>, except if both <code>margin-left</code> and <code>margin-right</code> are set to <code>auto</code>. In this case, it is set to the value centering the element inside its parent.</td>
+ <td>Block layout mode</td>
+ </tr>
+ <tr>
+ <th><code>block</code>, <code>inline</code>, <code>inline-block</code>, <code>block</code>, <code>table</code>, <code>inline-table</code>, <code>list-item</code>, <code>table-caption</code></th>
+ <th><code>left</code> or <code>right</code></th>
+ <th><code>static</code> or <code>relative</code></th>
+ <td><code>0</code></td>
+ <td>Block layout mode (floating element)</td>
+ </tr>
+ <tr>
+ <th><em>any </em><code>table-*</code><em>, except </em><code>table-caption</code></th>
+ <th><em>any</em></th>
+ <th><em>any</em></th>
+ <td><code>0</code></td>
+ <td>Internal <code>table-*</code> elements don't have margins, use {{ cssxref("border-spacing") }} instead</td>
+ </tr>
+ <tr>
+ <th><em>any, except <code>flex</code>,</em> <code>inline-flex</code><em>, or </em><code>table-*</code></th>
+ <th><em>any</em></th>
+ <th><em><code>fixed</code></em> or <code>absolute</code></th>
+ <td><code>0</code>, except if both <code>margin-left</code> and <code>margin-right</code> are set to <code>auto</code>. In this case, it is set to the value centering the border area inside the available <code>width</code>, if fixed.</td>
+ <td>Absolutely positioned layout mode</td>
+ </tr>
+ <tr>
+ <th><code>flex</code>, <code>inline-flex</code></th>
+ <th><em>any</em></th>
+ <th><em>any</em></th>
+ <td><code>0</code>, except if there is any positive horizontal free space. In this case, it is evenly distributed to all horizontal <code>auto</code> margins.</td>
+ <td>Flexbox layout mode</td>
+ </tr>
+ </tbody>
+ </table>
+ </dd>
+</dl>
+
+<h3 id="形式语法">形式语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="Examples" name="Examples">实例</h2>
+
+<pre class="eval">.content { margin-right: 5%; }
+.sidebox { margin-right: 10px; }
+.logo { margin-right: -5px; }
+</pre>
+
+<h2 id="Specifications" name="Specifications">说明</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('CSS3 Box', '#the-margin', 'margin-right') }}</td>
+ <td>{{ Spec2('CSS3 Box') }}</td>
+ <td>No significant change</td>
+ </tr>
+ <tr>
+ <td>{{ SpecName('CSS3 Transitions', '#animatable-css', 'margin-right') }}</td>
+ <td>{{ Spec2('CSS3 Transitions') }}</td>
+ <td>Defines <code>margin-right</code> as animatable.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('CSS3 Flexbox', '#item-margins', 'margin-right')}}</td>
+ <td>{{ Spec2('CSS3 Flexbox') }}</td>
+ <td>Defines the behavior of <code>margin-right</code> on flex items.</td>
+ </tr>
+ <tr>
+ <td>{{ SpecName('CSS2.1', 'box.html#margin-properties', 'margin-right') }}</td>
+ <td>{{ Spec2('CSS2.1') }}</td>
+ <td>Removes its effect on inline elements.</td>
+ </tr>
+ <tr>
+ <td>{{ SpecName('CSS1', '#margin-right', 'margin-right') }}</td>
+ <td>{{ Spec2('CSS1') }}</td>
+ <td>Initial definition</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_Compatibility" name="Browser_Compatibility">浏览器兼容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari (WebKit)</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>1.0</td>
+ <td>{{ CompatGeckoDesktop("1") }}</td>
+ <td>3.0</td>
+ <td>3.5</td>
+ <td>1.0 (85)</td>
+ </tr>
+ <tr>
+ <td><code>auto</code> value</td>
+ <td>1.0</td>
+ <td>{{ CompatGeckoDesktop("1") }}</td>
+ <td>6.0 (strict mode)</td>
+ <td>3.5</td>
+ <td>1.0 (85)</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Phone</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>1.0</td>
+ <td>{{ CompatGeckoMobile("1") }}</td>
+ <td>6.0</td>
+ <td>6.0</td>
+ <td>1.0</td>
+ </tr>
+ </tbody>
+</table>
+</div>