Common Web Browsers Layout Engines

What Layout engine do the common Web Browsers use?

IE

IE  uses Trident layout engine.
http://en.wikipedia.org/wiki/Trident_(layout_engine)

FireFox 

FireFox uses the GECKO layout engine
http://www-archive.mozilla.org/newlayout/doc/layout-2006-12-14/master.xhtml
https://wiki.mozilla.org/Gecko:Home_Page

Opera

Opera uses the Presto Engine
http://www.opera.com/docs/specs/presto29/

Safari

Safari uses the Webkit Layout Engine
http://www.webkit.org/

Chrome

Chrome uses the Webkit Layout Engine
http://www.google.com/chrome/intl/en/webmasters-faq.html
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