From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: viewport-fit
+slug: Web/CSS/@viewport/viewport-fit
+translation_of: Web/CSS/@viewport
+---
+<div>{{CSSRef}} {{Draft}} {{SeeCompatTable}}</div>
+
+<p><strong><code>viewport-fit</code></strong> CSS {{CSSxRef("@viewport")}}  {{Glossary("Descriptor (CSS)", "descriptor")}} 是为了控制文档是如何填充满屏幕的。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: css; no-line-numbers">/* 关键值*/
+viewport-fit: auto;
+viewport-fit: contain;
+viewport-fit: cover;
+</pre>
+
+<h3 id="属性值">属性值</h3>
+
+<dl>
+ <dt><code>auto</code></dt>
+ <dd>此值不影响初始布局视图端口，并且整个web页面都是可查看的。</dd>
+ <dt><code>contain</code></dt>
+ <dd>视图端口按比例缩放，以适合显示内嵌的最大矩形。</dd>
+ <dt><code>cover</code></dt>
+ <dd>视图端口被缩放以填充设备显示。强烈建议使用 <a href="/en-US/docs/Web/CSS/env">safe area inset 变量</a>，以确保重要内容不会出现在显示之外。</dd>
+</dl>
+
+<h3 id="形式语法">形式语法</h3>
+
+<pre><span style="color: #0000ff;">&lt;</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">name</span><span style="color: #0000ff;">="viewport"</span><span style="color: #ff0000;"> content</span><span style="color: #0000ff;">="width=device-width, initial-scale=1.0, <strong>viewport-fit=cover</strong>"</span><span style="color: #0000ff;">&gt;</span></pre>
+
+<h2 id="注意">注意</h2>
+
+<p>在使用 <code>viewport-fit</code> 描述符时，必须记住并不是所有的设备显示都是矩形的，因此应该使用<a href="/en-US/docs/Web/CSS/env">safe area inset 变量</a>。</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("CSS Round Display", "#viewport-fit-descriptor", '"viewport-fit" descriptor')}}</td>
+   <td>{{Spec2("CSS Round Display")}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">兼容性表是由结构化数据生成的。如果您要为数据做出贡献，请点击连接 <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 向我们发送请求。</div>
+
+<p>{{Compat("css.at-rules.viewport.viewport-fit")}}</p>
+
+<h2 id="另请参见">另请参见</h2>
+
+<ul>
+ <li>{{CSSxRef("env", "env()")}}</li>
+</ul>
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