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---
title: Gecko
slug: Mozilla/Gecko
tags:
- Gecko
- Mozilla
- NeedsTranslation
- TopicStub
translation_of: Mozilla/Gecko
---
<div class="summary">
<p><span class="seoSummary"><strong>Gecko</strong> is the name of the layout engine developed by the Mozilla Project. It was originally named NGLayout. Gecko's function is to read web content, such as <a href="/en-US/docs/HTML" title="HTML">HTML</a>, <a href="/en-US/docs/CSS" title="CSS">CSS</a>, <a href="/en-US/docs/XUL" title="XUL">XUL</a>, <a href="/en-US/docs/JavaScript" title="JavaScript">JavaScript</a>, and render it on the user's screen or print it. In XUL-based applications Gecko is used to render the application's user interface as well.</span></p>
</div>
<p>Gecko is used in many applications, including a few browsers, such as Firefox, SeaMonkey, etc. (for a complete list, please refer to <a class="external" href="http://en.wikipedia.org/wiki/Gecko_%28layout_engine%29#Web_browsers" rel="external" title="http://en.wikipedia.org/wiki/Gecko_(layout_engine)#Web_browsers">Wikipedia's article on Gecko</a>.) Products using the same version of Gecko have identical support for standards.</p>
<table class="topicpage-table">
<tbody>
<tr>
<td>
<h2 class="Documentation" id="Documentation">Documentation</h2>
<dl>
<dt><a href="/en-US/docs/Mozilla/Gecko/Chrome">Chrome</a></dt>
<dd>
<p>This page contains information specific to Chrome code running in Gecko.</p>
</dd>
<dt><a href="/en-US/docs/Gecko_FAQ" title="Gecko_FAQ">Gecko FAQ</a></dt>
<dd>Frequently asked questions about Gecko.</dd>
<dt><a href="/en-US/docs/Gecko_DOM_Reference" title="https://developer.mozilla.org/en-US/docs/Gecko_DOM_Reference">Gecko DOM reference</a></dt>
<dd>Reference to the DOM.</dd>
<dt><a href="/en-US/docs/Gecko-Specific_DOM_Events" title="Gecko/Gecko event reference">Gecko event reference</a></dt>
<dd>Reference to events used within Gecko and Mozilla applications; for web-standard DOM events, see the <a href="/en-US/docs/DOM/DOM_event_reference" title="DOM/DOM event reference">DOM event reference</a>.</dd>
<dt><a href="/en-US/docs/Gecko/Versions" title="Gecko/Versions">Gecko versions and application versions</a></dt>
<dd>Versions of Gecko and the applications they're used in.</dd>
<dt><a class="external" href="/en-US/docs/Introduction_to_Layout_in_Mozilla" title="https://developer.mozilla.org/en-US/docs/Introduction_to_Layout_in_Mozilla">Introduction to Layout in Mozilla</a></dt>
<dd>Tech Talk on layout.</dd>
<dt><a href="/en-US/docs/Embedding_Mozilla" title="Embedding_Mozilla">Embedding Mozilla</a></dt>
<dd>Using Gecko in your own application.</dd>
<dt><a href="/en-US/docs/Character_Sets_Supported_by_Gecko" title="Character Sets Supported by Gecko">Character sets supported by Gecko</a></dt>
<dd>A list of the character sets supported by Gecko.</dd>
<dt><a href="/en-US/docs/Gecko/HTML_parser_threading" title="Gecko/HTML_parser_threading">HTML parser threading</a></dt>
<dd>Description of multithreading in the HTML parser.</dd>
<dt>{{interwiki('wikimo', 'Gecko:Home_Page', 'Gecko Home Page on MozillaWiki')}}</dt>
<dd>Home for the active developers. Roadmaps and more up-to-date resources.</dd>
</dl>
<p><span class="alllinks"><a href="/en-US/docs/tag/Gecko" title="tag/Gecko">View All...</a></span></p>
</td>
<td>
<h2 class="Community" id="Community">Community</h2>
<ul>
<li>View Mozilla forums... {{DiscussionList("dev-tech-layout", "mozilla.dev.tech.layout")}}</li>
</ul>
<h2 class="Related_Topics" id="Related_Topics">Related Topics</h2>
<dl>
<dd><a href="/en-US/docs/Web_Standards" title="Web_Standards">Web Standards</a>, <a href="/en-US/docs/XUL" title="XUL">XUL</a>, <a href="/en-US/docs/Embedding_Mozilla" title="Embedding_Mozilla">Embedding Mozilla</a>, <a href="/en-US/docs/Developer_Guide" title="Developing_Mozilla">Developing Mozilla</a></dd>
</dl>
</td>
</tr>
</tbody>
</table>
<p> </p>
|
