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+---
+title: height
+slug: Web/CSS/@viewport/height
+translation_of: Web/CSS/@viewport
+---
+<div>{{CSSRef}}</div>
+
+<h2 id="概要">概要</h2>
+
+<p><font face="Consolas, Liberation Mono, Courier, monospace"><strong>高度 </strong></font>的 CSS 描述符是用於設定兩者的簡易描述符 {{cssxref("@viewport/min-height", "min-height")}} 與 {{cssxref("@viewport/max-height", "max-height")}} 的可視區域(viewport)。提供一個可視區域的長度值，將設定兩者的最小高度與最大高度的值。</p>
+
+<p>如果提供了兩個可視區域(viewport)，第一個值將設定為最小高度，而第二個值將設定為最大高度。</p>
+
+<h2 id="語法">語法</h2>
+
+<pre class="brush: css">/* One value */
+height: auto;
+height: 320px;
+height: 15em;
+
+/* Two values */
+height: 320px 200px;
+</pre>
+
+<h3 id="值">值</h3>
+
+<dl>
+ <dt><code>auto</code></dt>
+ <dd>使用 CSS 描述符來進行值的計算。</dd>
+ <dt><code>&lt;length&gt;</code></dt>
+ <dd>非負絕對值或相對長度。</dd>
+ <dt><code>&lt;percentage&gt;</code></dt>
+ <dd>初始可視區域的相對寬度或相對高度百分比的縮放係數為 1.0，且必須是非負數。</dd>
+</dl>
+
+<h3 id="正式語法">正式語法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}
+</pre>
+
+<h2 id="舉例">舉例</h2>
+
+<pre class="brush: css">@viewport {
+  height: 500px;
+}</pre>
+
+<h2 id="格式">格式</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 Device', '#descdef-viewport-height', '"height" descriptor')}}</td>
+   <td>{{Spec2('CSS3 Device')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器兼容性">瀏覽器兼容性</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>29 (behind a flag)</td>
+   <td>{{CompatNo}}</td>
+   <td>10 {{property_prefix("-ms")}}</td>
+   <td>11.10<br>
+    Removed in 15<br>
+    Reintroduced behind a flag in 16</td>
+   <td>{{CompatNo}}</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>4.4</td>
+   <td>29</td>
+   <td>{{CompatNo}}</td>
+   <td>10{{property_prefix("-ms")}}</td>
+   <td>11.10<br>
+    Removed in 15<br>
+    Reintroduced behind a flag in 16</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
diff --git a/files/zh-tw/web/css/@viewport/index.html b/files/zh-tw/web/css/@viewport/index.html
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+---
+title: '@viewport'
+slug: Web/CSS/@viewport
+tags:
+  - Adaptation
+  - At-rule
+  - CSS
+  - Device
+  - NeedsContent
+  - NeedsTranslation
+  - Reference
+  - TopicStub
+translation_of: Web/CSS/@viewport
+---
+<p>{{CSSRef}}</p>
+
+<h2 id="Summary">Summary</h2>
+
+<p>The<strong> <code>@viewport</code></strong> <a href="/en/CSS" title="CSS">CSS</a> <a href="/en/CSS/At-rule" title="en/CSS/At-rule">at-rule</a> contains a set of nested descriptors in a CSS block that is delimited by curly braces. These descriptors control viewport settings, primarily on mobile devices.</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<p>A <em>zoom factor</em> of <code>1.0</code> or <code>100%</code> corresponds to no zooming. Larger values zoom in. Smaller values zoom out.</p>
+
+<h3 id="Descriptors">Descriptors</h3>
+
+<p>Browsers are supposed to ignore unrecognized descriptors.</p>
+
+<dl>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/min-width"><code>min-width</code></a></dt>
+ <dd>Used in the determination of the width of the viewport when the document is first displayed.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/max-width"><code>max-width</code></a></dt>
+ <dd>Used in the determination of the width of the viewport when the document is first displayed.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/width"><code>width</code></a></dt>
+ <dd>A shorthand descriptor for setting both <code>min-width</code> and <code>max-width</code></dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/min-height"><code>min-height</code></a></dt>
+ <dd>Used in the determination of the height of the viewport when the document is first displayed.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/max-height"><code>max-height</code></a></dt>
+ <dd>Used in the determination of the height of the viewport when the document is first displayed.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/height"><code>height</code></a></dt>
+ <dd>A shorthand descriptor for setting both <code>min-height</code> and <code>max-height</code></dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/zoom"><code>zoom</code></a></dt>
+ <dd>Sets the initial zoom factor.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/min-zoom"><code>min-zoom</code></a></dt>
+ <dd>Sets the minimum zoom factor.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/max-zoom"><code>max-zoom</code></a></dt>
+ <dd>Sets the maximum zoom factor.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/user-zoom"><code>user-zoom</code></a></dt>
+ <dd>Controls whether or not the user should be able to change the zoom factor.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/@viewport/orientation"><code>orientation</code></a></dt>
+ <dd>Controls the document's orientation.</dd>
+</dl>
+
+<h3 id="Formal_syntax">Formal syntax</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="Examples">Examples</h2>
+
+<pre class="eval" style="font-size: 14px;">@viewport {
+  min-width: 640px;
+  max-width: 800px;
+}
+@viewport {
+  zoom: 0.75;
+  min-zoom: 0.5;
+  max-zoom: 0.9;
+}
+@viewport {
+  orientation: landscape;
+}</pre>
+
+<h2 id="Specifications" name="Specifications">Specifications</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 Device', '#the-atviewport-rule', '@viewport')}}</td>
+   <td>{{Spec2('CSS3 Device')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</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>29 (behind a flag) [4]</td>
+   <td>{{CompatNo()}} [2]</td>
+   <td>10 {{property_prefix("-ms")}}</td>
+   <td>11.10<br>
+    Removed in 15<br>
+    Reintroduced behind a flag in 16</td>
+   <td>{{CompatNo}} [3]</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>4.4</td>
+   <td>29</td>
+   <td>{{CompatNo}} [2]</td>
+   <td>10{{property_prefix("-ms")}}[1]</td>
+   <td>11.10<br>
+    Removed in 15<br>
+    Reintroduced behind a flag in 16</td>
+   <td>{{CompatNo}} [3]</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] There is a bug in IE Mobile 10 on older versions of Windows Phone 8, where <code>device-width</code>, when used within <code>@-ms-viewport</code>, evaluates to the screen width in physical pixels rather than normalized CSS pixels, which is wrong according to the specification. However, when used within a <code>viewport</code> {{HTMLElement("meta")}} tag, <code>device-width</code> evaluates correctly. According to Microsoft, this bug was fixed in <a href="http://blogs.windows.com/windows_phone/b/wpdev/archive/2013/10/14/introducing-windows-phone-preview-for-developers.aspx">Windows Phone 8 Update 3 (a.k.a. GDR3)</a>, although there are some reports that the <a href="http://www.nokia.com/us-en/windows-phone-black-update/">Lumia Black</a> GDR3 update did not fix the bug (at least on the Lumia 920). For more details and a workaround, <a href="http://timkadlec.com/2013/01/windows-phone-8-and-device-width/">see Tim Kadlec's blog post "Windows Phone 8 and Device-Width"</a>.</p>
+
+<p>[2]: See {{bug(747754, 'summary')}}</p>
+
+<p>[3]: See {{webkitbug(95959)}}</p>
+<p>[4]: See <a href="https://bugs.chromium.org/p/chromium/issues/detail?id=235457">Chromium issue #235457: Enable @viewport on all platforms</a></p>
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{HTMLElement("meta")}}, specifically <code>&lt;meta name="viewport"&gt;</code></li>
+ <li><a href="/en-US/docs/Mobile/Viewport_meta_tag">Using the viewport meta tag to control layout on mobile browsers</a></li>
+</ul>