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+---
+title: HTMLElement.offsetTop
+slug: Web/API/HTMLElement/offsetTop
+translation_of: Web/API/HTMLElement/offsetTop
+---
+<div>{{ APIRef("HTML DOM") }}</div>
+
+<p><strong><code>HTMLElement.offsetTop</code></strong> 为只读属性，它返回当前元素相对于其 {{domxref("HTMLElement.offsetParent","offsetParent")}} 元素的顶部内边距的距离。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><var>topPos</var> = element.offsetTop;
+</pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<ul>
+ <li><code>topPos</code> 为返回的像素数。</li>
+</ul>
+
+<h2 id="Example" name="Example">示例</h2>
+
+<pre class="brush:js">var d = document.getElementById("div1");
+var topPos = d.offsetTop;
+
+if (topPos &gt; 10) {
+  // div1 距离它的 offsetParent 元素的顶部的距离大于 10 px
+}</pre>
+
+<h2 id="Specification" name="Specification">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">规范名称</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">备注</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('CSSOM View', '#dom-htmlelement-offsettop', 'offsetTop')}}</td>
+   <td>{{Spec2('CSSOM View')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibility" name="Compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("api.HTMLElement.offsetTop")}}</p>
+
+<p>In compliance with the specification, this property will return <code>null</code> on Webkit if the element is hidden (the <code>style.display</code> of this element or any ancestor is <code>"none"</code>) or if the <code>style.position</code> of the element itself is set to <code>"fixed"</code>.</p>
+
+<p>This property will return <code>null</code> on Internet Explorer (9) if the <code>style.position</code> of the element itself is set to <code>"fixed"</code>. (Having <code>display:none</code> does not affect this browser.)</p>