Editing Gecko (software) (section)

{{Short description|Open-source HTML layout engine}}
{{Infobox software
| name = Gecko
| logo = [[file:Mozillagecko-logo.svg|81x89px]]
| screenshot = 
| caption = 
| developer = [[Mozilla Foundation]], [[Mozilla Corporation]], [[Adobe Systems]], and other contributors
| programming language = [[C++]], [[JavaScript]], [[Rust (programming language)|Rust]]
| genre = [[Browser engine]]
| license = [[Mozilla Public License|MPL 2.0]]<ref>{{Cite web|url=https://www.mozilla.org/en-US/about/legal/eula/|title=Mozilla Foundation End-User Licensing Agreements|website=Mozilla}}</ref><ref>{{Cite web |url = https://www.mozilla.org/foundation/licensing.html |title = Mozilla Licensing Policies |publisher = mozilla.org |access-date = 2013-03-26}}</ref>
| latest release version = 125
| latest release date = {{start date and age|{{wikidata|qualifier|P348|P577}}}}
| released = 1998 as ''NGLayout''
| website = {{URL|https://developer.mozilla.org/en-US/docs/Glossary/Gecko}}
}}
{{Firefox TOC}}
'''Gecko''' (stylized as ɢecko) is a [[browser engine]] developed by [[Mozilla]]. It is used in the [[Firefox]] browser, the [[Mozilla Thunderbird|Thunderbird]] [[email client]], and in a discontinued state on AOL's [[Netscape 4]], [[Netscape 6]], [[Netscape 7]], [[Netscape Browser]] and [[Netscape Navigator 9]]; this is alongside many other projects.

Gecko is designed to support [[Open standard|open]] [[web standards|Internet standards]], and is used by different applications to display [[web page]]s and, in some cases, an application's [[user interface]] itself (by rendering [[XUL]]). Gecko offers a rich programming [[application programming interface|API]] that makes it suitable for a wide variety of roles in Internet-enabled applications, such as [[web browsers]], content presentation, and [[client/server]].<ref>{{cite web |url = https://www.mozilla.org/projects/embedding/ |title = Embedding Mozilla |publisher = Mozilla.org |date = 2012-10-25 |access-date = 2012-10-31 }}</ref>

Gecko is written in [[C++]] and [[JavaScript]],<ref name="Android build">{{cite web |url=https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Simple_Firefox_for_Android_build |title=Simple Firefox for Android build |quote=Gecko is implemented using C++ and JavaScript.<!--at least for Android--> |access-date=2017-05-03 |archive-date=2019-09-29 |archive-url=https://web.archive.org/web/20190929165146/https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Simple_Firefox_for_Android_build |url-status=dead }}</ref><ref name="Servo_paper">{{cite journal|last1=Bergstrom|display-authors=etal|first1=Lars|title=Engineering the Servo Web Browser Engine using Rust|journal=Proceedings of the International Conference on Software Engineering|date=May 2016|url=https://raw.githubusercontent.com/larsbergstrom/papers/master/icse16-servo-preprint.pdf |archive-url=https://web.archive.org/web/20160529014010/https://raw.githubusercontent.com/larsbergstrom/papers/master/icse16-servo-preprint.pdf |archive-date=2016-05-29 |url-status=live}}</ref> and, since 2016, additionally in [[Rust (programming language)|Rust]].<ref>{{Cite web|url=https://groups.google.com/forum/m/#!msg/mozilla.dev.platform/Gzwh1IbxvHE/7RlO21I6DwAJ|title=Google Groups|website=groups.google.com}}</ref><ref>{{Cite web|url=https://www.infoworld.com/article/3165424/mozilla-binds-firefoxs-fate-to-the-rust-language.html|title=Mozilla binds Firefox's fate to the Rust language|first=Serdar|last=Yegulalp|date=February 3, 2017|website=InfoWorld}}</ref> It is [[free and open-source software]] subject to the terms of the [[Mozilla Public License]] version 2.<ref>{{cite web |url = https://wiki.mozilla.org/MPL_Upgrade |title = MPL 2 Upgrade |access-date = 2012-08-18 }}</ref> Mozilla officially supports its use on [[Android (operating system)|Android]],<ref name="Android build"/> [[Linux]], [[macOS]], and [[Windows]].<ref>{{Cite web|url=https://developer.mozilla.org/en-US/docs/Gecko/FAQ|title=Gecko FAQ|website=MDN Web Docs|access-date=2017-05-03|archive-date=2019-10-08|archive-url=https://web.archive.org/web/20191008071852/https://developer.mozilla.org/en-US/docs/Gecko/FAQ|url-status=dead}}</ref>