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+---
+title: 初始值
+slug: Web/CSS/initial_value
+tags:
+  - CSS
+  - Reference
+translation_of: Web/CSS/initial_value
+---
+<div>{{cssref}}</div>
+
+<p><a href="/zh-CN/docs/Web/CSS">CSS</a>属性的<strong>初始值</strong>是其默认值，如其定义表中所列。 初始值的使用取决于属性是否被继承：</p>
+
+<ul>
+ <li>对于<a href="/en-US/docs/CSS/inheritance#Inherited_properties" title="en/CSS/inheritance#Inherited_properties">继承属性</a>，初始值只能被用于没有指定值的<strong>根元素</strong>上。</li>
+ <li>对于<a href="/en-US/docs/CSS/inheritance#Non-inherited_properties" title="en/CSS/inheritance#Non-inherited_properties">非继承属性</a>，初始值可以被用于<strong>任意</strong>没有指定值的元素上。</li>
+</ul>
+
+<div class="note">
+<p><strong>注意：</strong>你可以使用 <code><a href="/en-US/docs/CSS/initial" title="en/CSS/initial">initial</a></code> 关键词明确指定初始值。</p>
+</div>
+
+<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><a href="https://drafts.csswg.org/css-cascade-4/#initial-values">CSS Cascade 4</a></td>
+   <td></td>
+   <td>Formal definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("CSS2.1", "cascade.html#specified-value", "initial value")}}</td>
+   <td>{{Spec2("CSS2.1")}}</td>
+   <td>Implicit definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{cssxref("initial")}}</li>
+ <li>{{CSS_key_concepts}}</li>
+</ul>