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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: left
+slug: Web/CSS/left
+tags:
+ - CSS
+ - CSS Positioning
+ - CSS Property
+ - Reference
+translation_of: Web/CSS/left
+---
+<div>{{CSSRef}}</div>
+
+<p><a href="/zh-CN/docs/Web/CSS">CSS</a> <strong><code>left</code></strong>属性定义了定位元素的左外边距边界与其包含块左边界之间的偏移,非定位元素设置此属性无效。</p>
+
+<pre class="brush: css">/* &lt;length&gt; values */
+left: 3px;
+left: 2.4em;
+
+/* &lt;percentage&gt;s of the width of the containing block */
+left: 10%;
+
+/* Keyword value */
+left: auto;
+
+/* Global values */
+left: inherit;
+left: initial;
+left: unset;
+</pre>
+
+<p><code>left</code>的效果取决于元素的<code>position</code>属性:</p>
+
+<ul>
+ <li>当<code>position</code>设置为<code>absolute</code>或<code>fixed</code>时,<code>left</code>属性指定了定位元素左外边距边界与其包含块左边界之间的偏移。</li>
+ <li>当<code>position</code>设置为<code>relative</code>时,<code>left</code>属性指定了元素的左边界离开其正常位置的偏移。</li>
+ <li>当<code>position</code>设置为<code>sticky</code>时,如果元素在viewport里面,<code>left</code>属性的效果和position为<code>relative</code>等同;如果元素在viewport外面,<code>left</code>属性的效果和position为<code>fixed</code>等同。</li>
+ <li>当<code>position</code>设置为<code>static</code>时,<code>left</code>属性无效。</li>
+</ul>
+
+<p>当<font face="consolas, Liberation Mono, courier, monospace"><code>left</code>和</font>{{cssxref("right")}}​​​​​​同时指定时,元素的位置会被重复指定。当容器是从左到右时,<code>left</code>的值会被优先设定;当容器是从右到左时,<code>right</code>的值会被优先设定。</p>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="语法">语法</h2>
+
+<h3 id="值">值</h3>
+
+<dl>
+ <dt>{{cssxref("&lt;length&gt;")}}</dt>
+ <dd>可以是负的,正的 或者 null {{cssxref("&lt;length&gt;")}} 表示:
+ <ul>
+ <li>对于绝对定位的元素,元素左外边距边界与其包含块左边界之间的偏移。</li>
+ <li>对于相对定位定位的元素,元素的左边界离开其正常位置的偏移。</li>
+ </ul>
+ </dd>
+ <dt>{{cssxref("&lt;percentage&gt;")}}</dt>
+ <dd>代表元素包含块的宽度的百分比 {{cssxref("&lt;percentage&gt;")}}。</dd>
+ <dt><code>auto</code></dt>
+ <dd>这个关键字表示:
+ <ul>
+ <li>对于绝对定位元素,元素将忽略此属性而以{{ Cssxref("right") }}属性为准,如果此时设置<code>width: auto</code>,将基于内容需要的宽度设置宽度;如果<code>right</code>也为<code>auto</code>的话,元素的水平位置就是它假如作为静态(即static)元素时该在的位置。</li>
+ <li>对于相对定位元素,元素相对正常位置的偏移量将基于{{ Cssxref("right") }}属性;如果<code>right</code>也为<code>auto</code>的话,元素将不会有偏移。</li>
+ </ul>
+ </dd>
+ <dt><code>inherit</code></dt>
+ <dd>这个关键字表示该值与其父元素 (可能不是它的包含块) 的计算值相同。对这个计算值的处理将和它原本为 {{cssxref("&lt;length&gt;")}}, {{cssxref("&lt;percentage&gt;")}} 或 <code>auto</code> 一样。</dd>
+</dl>
+
+<h3 id="常用语法">常用语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="CSS">CSS</h3>
+
+<pre class="brush: css">#wrap {
+ width: 700px;
+ margin: 0 auto;
+ background: #5C5C5C;
+}
+
+pre {
+ white-space: pre;
+ white-space: pre-wrap;
+ white-space: pre-line;
+ word-wrap: break-word;
+}
+
+#example_1 {
+ width: 200px;
+ height: 200px;
+ position: absolute;
+ left: 20px;
+ top: 20px;
+ background-color: #D8F5FF;
+}
+
+#example_2 {
+ width: 200px;
+ height: 200px;
+ position: relative;
+ top: 0;
+ right: 0;
+ background-color: #C1FFDB;
+
+}
+#example_3 {
+ width: 600px;
+ height: 400px;
+ position: relative;
+ top: 20px;
+ left: 20px;
+ background-color: #FFD7C2;
+}
+
+#example_4 {
+ width:200px;
+ height:200px;
+ position:absolute;
+ bottom:10px;
+ right:20px;
+ background-color:#FFC7E4;
+}</pre>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;div id="wrap"&gt;
+ &lt;div id="example_1"&gt;
+ &lt;pre&gt;
+ position: absolute;
+ left: 20px;
+ top: 20px;
+ &lt;/pre&gt;
+ &lt;p&gt;The only containing element for this div is the main window, so it positions itself in relation to it.&lt;/p&gt;
+ &lt;/div&gt;
+
+ &lt;div id="example_2"&gt;
+ &lt;pre&gt;
+ position: relative;
+ top: 0;
+ right: 0;
+ &lt;/pre&gt;
+ &lt;p&gt;Relative position in relation to its siblings.&lt;/p&gt;
+ &lt;/div&gt;
+
+ &lt;div id="example_3"&gt;
+ &lt;pre&gt;
+ float: right;
+ position: relative;
+ top: 20px;
+ left: 20px;
+ &lt;/pre&gt;
+ &lt;p&gt;Relative to its sibling div above, but removed from flow of content.&lt;/p&gt;
+
+ &lt;div id="example_4"&gt;
+ &lt;pre&gt;
+ position: absolute;
+ bottom: 10px;
+ right: 20px;
+ &lt;/pre&gt;
+ &lt;p&gt;Absolute position inside of a parent with relative position&lt;/p&gt;
+ &lt;/div&gt;
+ &lt;/div&gt;
+&lt;/div&gt;</pre>
+
+<h3 id="案例">案例</h3>
+
+<p>{{EmbedLiveSample('示例',1200,650)}}</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('CSS3 Transitions', '#animatable-css', 'left')}}</td>
+ <td>{{Spec2('CSS3 Transitions')}}</td>
+ <td>Defines <code>left</code> as animatable.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('CSS3 Positioning', '#propdef-left', 'left')}}</td>
+ <td>{{Spec2('CSS3 Positioning')}}</td>
+ <td>Adds behavior for sticky positioning.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('CSS2.1', 'visuren.html#propdef-left', 'left')}}</td>
+ <td>{{Spec2('CSS2.1')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+<div class="hidden">The compatibility table in 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.</div>
+
+<p>{{Compat("css.properties.left")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{cssxref("position")}}, {{cssxref("right")}}, {{cssxref("top")}}, {{cssxref("bottom")}}</li>
+</ul>