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+---
+title: orientation
+slug: Web/CSS/@viewport/orientation
+tags:
+  - CSS
+  - CSS Description
+translation_of: Web/CSS/@viewport
+translation_of_original: Web/CSS/@viewport/orientation
+---
+<div>{{CSSRef}}</div>
+
+<h2 id="摘要">摘要</h2>
+
+<p>此 <strong><code>orientation</code></strong> <a href="https://developer.mozilla.org/en-US/docs/Web/CSS">CSS</a> 描述符控制由{{cssxref("@viewport")}}定义文档的方向。</p>
+
+<p><span style="line-height: 1.5;">通过设备的倾斜摆动情况来决定文档显示的方向，作者可以通过设置这个描述符来抑制方向的变化{{cssinfo}}</span></p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush:css">/* Keyword values */
+orientation: auto;
+orientation: portrait;/*锁定为纵向*/
+orientation: landscape;/* 锁定为横向*/
+</pre>
+
+<h3 id="取值">取值</h3>
+
+<dl>
+ <dt><code>auto</code></dt>
+ <dd>用户代理将文档的方向设置为自动，通常基于设备的定位由加速度传感器 （如果设备具有这种硬件传感器），但是用户控制，OS 级别的"锁方向"往往会优先于加速度传感器的设置。</dd>
+ <dt><code>portrait</code></dt>
+ <dd>文档被锁定为纵向。</dd>
+ <dt><code>landscape</code></dt>
+ <dd>文档被锁定为横向。</dd>
+</dl>
+
+<h3 id="标准语法">标准语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">标准</th>
+   <th scope="col">注释</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('CSS3 Device', '#the-lsquoorientationrsquo-descriptor', '"orientation" descriptor')}}</td>
+   <td>{{Spec2('CSS3 Device')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">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</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>10 {{property_prefix("-ms")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>8 {{property_prefix("-o")}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>