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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>