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+---
+title: padding-top
+slug: Web/CSS/padding-top
+tags:
+  - CSS
+  - CSS 内边距
+  - CSS 属性
+translation_of: Web/CSS/padding-top
+---
+<div>{{CSSRef}}</div>
+
+<p>CSS属性 <strong>padding-top </strong>是指一个元素在内边距区域（padding area）中上方的高度。内边距（padding）是指一个元素的内容和边框之间的区域。和外边距（margin）不同，内边距（padding）是不允许有负值的。内边距（padding）可以用四个值声明一个元素的四个方向的内边距（paddings），这是一种CSS缩写属性。</p>
+
+<p><img alt="The effect of the CSS padding-top property on the element box" src="/files/4105/padding-top.svg" style="border-style: solid; border-width: 1px; display: block; margin: 0px auto;"></p>
+
+<pre class="brush:css no-line-numbers">/* &lt;length&gt; values */
+padding-top: 0.5em;
+padding-top: 0;
+padding-top: 2cm;
+
+/* &lt;percentage&gt; value */
+padding-top: 10%;
+
+/* Global values */
+padding-top: inherit;
+padding-top: initial;
+padding-top: unset;
+</pre>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="Syntax" name="Syntax">语法规则</h2>
+
+<h3 id="Values" name="Values">取值</h3>
+
+<dl>
+ <dt>{{cssxref("length")}}</dt>
+ <dd>当内边距（padding）大小是一个固定单位数值的时候，一定不能为负数。</dd>
+ <dt>{{cssxref("percentage")}}</dt>
+ <dd>当内边距（padding）是一个百分比的时候， 百分比是和<strong>包含块（containing block）的宽度</strong>有关的，同样一定不能为负数。</dd>
+</dl>
+
+<h3 id="正式语法">正式语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="Examples" name="Examples">实例</h2>
+
+<pre class="brush: css">.content { padding-top: 5%; }
+.sidebox { padding-top: 10px; }
+</pre>
+
+<h2 id="详细说明">详细说明</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 Box', '#the-padding', 'padding-top') }}</td>
+   <td>{{ Spec2('CSS3 Box') }}</td>
+   <td>No change from {{ SpecName('CSS2.1', 'box.html#padding-properties', 'padding-top') }}.</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('CSS3 Transitions', '#animatable-css', 'padding-top') }}</td>
+   <td>{{ Spec2('CSS3 Transitions') }}</td>
+   <td>Defines <code>padding-top</code> as animatable.</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('CSS2.1', 'box.html#padding-properties', 'padding-top') }}</td>
+   <td>{{ Spec2('CSS2.1') }}</td>
+   <td>No change from {{ Specname('CSS1', '#padding-top', 'padding-top') }}.</td>
+  </tr>
+  <tr>
+   <td>{{ Specname('CSS1', '#padding-top', 'padding-top') }}</td>
+   <td>{{ Spec2('CSS1') }}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_Compatibility" name="Browser_Compatibility">浏览器的兼容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>1.0</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>1.0 (1.0)</td>
+   <td>4.0</td>
+   <td>3.5</td>
+   <td>1.0 (85)</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="更多浏览"> 更多浏览</h2>
+
+<ul>
+ <li><a class="internal" href="/en/CSS/box_model" title="en/CSS/box model">CSS Box Model</a></li>
+ <li>The {{cssxref("padding")}} shorthand property can be used to set paddings on all four sides of an element with a single declaration: <code>padding-top</code>, {{cssxref("padding-right")}}, {{cssxref("padding-bottom")}}, and {{cssxref("padding-left")}}.</li>
+</ul>
+
+<p>
+ <audio style="display: none;"> </audio>
+</p>