---
title: Microsoft JavaScript extensions
slug: Archive/Web/JavaScript/Microsoft_Extensions
tags:
  - JavaScript
  - 'JavaScript:Microsoft Extensions'
  - NeedsTranslation
  - Non-standard
  - Reference
  - TopicStub
translation_of: Archive/Web/JavaScript/Microsoft_Extensions
---
<div>{{JSSidebar("Microsoft Extensions")}}{{Non-standard_Header}}
<div class="blockIndicator warning">
<p><strong>Warning:</strong> These APIs will only work in Microsoft applications, and are not on a standards track.</p>
</div>
</div>

<p>Microsoft browsers (Internet Explorer, and in a few cases, Microsoft Edge) support a number of special Microsoft extensions to the otherwise standard <a href="/en-US/docs/Web/JavaScript">JavaScript APIs</a>.</p>

<h2 id="Objects">Objects</h2>

<div class="index">
<ul>
 <li>{{jsxref("ActiveXObject")}} {{obsolete_inline}}</li>
 <li>{{jsxref("Debug")}} {{deprecated_inline}}</li>
 <li>{{jsxref("Enumerator")}} {{obsolete_inline}}</li>
 <li>{{jsxref("VBArray")}} {{obsolete_inline}}</li>
</ul>
</div>

<h2 id="Functions">Functions</h2>

<div class="index">
<ul>
 <li>{{jsxref("GetObject")}} {{obsolete_inline}}</li>
 <li>{{jsxref("ScriptEngine")}} {{deprecated_inline}}</li>
 <li>{{jsxref("ScriptEngineBuildVersion")}} {{deprecated_inline}}</li>
 <li>{{jsxref("ScriptEngineMajorVersion")}} {{deprecated_inline}}</li>
 <li>{{jsxref("ScriptEngineMinorVersion")}} {{deprecated_inline}}</li>
</ul>
</div>

<h2 id="Statements">Statements</h2>

<div class="index">
<ul>
 <li><a href="/en-US/docs/Web/JavaScript/Microsoft_JavaScript_extensions/at-cc-on">@cc-on</a> {{obsolete_inline}}</li>
 <li><a href="/en-US/docs/Web/JavaScript/Microsoft_JavaScript_extensions/at-if">@if</a> {{obsolete_inline}}</li>
 <li><a href="/en-US/docs/Web/JavaScript/Microsoft_JavaScript_extensions/at-set">@set</a> {{obsolete_inline}}</li>
</ul>
</div>

<h2 id="Other">Other</h2>

<div class="index">
<ul>
 <li><code><a href="/en-US/docs/Web/JavaScript/Microsoft_JavaScript_extensions/Date.getVarDate">Date.getVarDate()</a></code> {{obsolete_inline}}</li>
 <li><code><a href="/en-US/docs/Web/JavaScript/Microsoft_JavaScript_extensions/Error.description">Error.description</a></code> {{deprecated_inline}}</li>
 <li><code><a href="/en-US/docs/Web/JavaScript/Microsoft_JavaScript_extensions/Error.number">Error.number</a></code> {{deprecated_inline}}</li>
 <li><code><a href="/en-US/docs/Web/JavaScript/Microsoft_JavaScript_extensions/Error.stackTraceLimit">Error.stackTraceLimit</a></code> {{deprecated_inline}}</li>
</ul>
</div>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/CSS/Microsoft_Extensions">Microsoft CSS Extensions</a></li>
 <li><a href="/en-US/docs/Web/API/Microsoft_API_extensions">Microsoft DOM Extensions</a></li>
</ul>