HTML Layout Engines

HTML Layout Engines (or HTML render engine) is a library used for webpage render from markup language groups (or relate) i.e. HTML, XHTML, CSS, JavaScript (ECMAScript), DOM, XML, XHTML, MathML, XForms, SVG, RDF, etc...

2 Popular engines:

Gecko
used in Firefox, Camino, Flock, SeaMonkey, K-Meleon, Netscape. Original development by Netscape, currently develop by Mozilla

KHTML
used in Konqueror, WebKit, Safari. Develop by KDE (for using with Konqueror). It is small library, most mobile phone used it!

For another library, check out: Trident, Tasman, WebCore, Presto, iCab. Did you know? and it have not only these. Please visit wikipedia: List of layout engines page for full list!

Internet Explorer (Microsoft) used Trident, but IE for Mac they use Tasman). Presto using in Opera and WebCore is KHTML + KJS (Java Script) using in Safari.
check out for compare

You can visit blognone: Browser. They have many web browser update news. (Thai Language)

Links
List_of_layout_engines
Comparison_of_layout_engines
Engines list: Trident · Presto · Gecko · Tasman · WebCore · KHTML · iCab · Prince · GtkHTML · Gzilla · Boxely · Tkhtml · Robin