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---
title: VisualViewport.offsetTop
slug: Web/API/VisualViewport/offsetTop
tags:
- API
- offsetTop
translation_of: Web/API/VisualViewport/offsetTop
---
<p>{{SeeCompatTable}}{{APIRef("Visual Viewport")}}</p>
<p>{{domxref("VisualViewport")}} 接口的只读属性 <strong><code>offsetTop</code></strong> 返回视觉视口的顶部相对于布局视口的顶部的偏移量，以CSS像素为单位。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">var <em>offsetTop</em> = VisualViewport.offsetTop</pre>
<h3 id="值">值</h3>
<p>一个双精度值。</p>
<h2 id="定义">定义</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('Visual Viewport','#dom-visualviewport-offsettop','offsetTop')}}</td>
<td>{{Spec2('Visual Viewport')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{Compat("api.VisualViewport.offsetTop")}}</p>
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