Comparison of layout engines

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The following tables compare general and technical information for a number of layout engines. Please see the individual products' articles for further information. This article is not all-inclusive or necessarily up-to-date. Unless otherwise specified in footnotes, comparisons are based on the stable versions without any add-ons, extensions or external programs.


General information

Basic general information about the engines: creator/company, license, etc.

Engine Creator Software license Leading application
Gecko Netscape/Mozilla Foundation MPL/GNU GPL/GNU LGPL tri-license Mozilla Firefox
GtkHTML (Based on KHTML) GNOME GNU LGPL Novell Evolution
iCab Alexander Clauss Proprietary iCab
Presto Opera Software Proprietary Opera
Prince XML YesLogic Pty Ltd Proprietary Prince XML
XEP RenderX Proprietary XEP
Robin Ritlabs Proprietary The Bat!
Tasman Microsoft Proprietary Microsoft Entourage
Trident Microsoft Proprietary Internet Explorer
WebKit (Based on KHTML) WebKit Foundation GNU LGPL, BSD-style Safari, Google Chrome

Release history

A brief overview of the release history.

Engine First public release First stable release Latest stable release
Date Version Date Version Date Version
Gecko December 7, 1998 "Preview" March 19, 1999 M3 January 21, 2010 1.9.2
GtkHTML 2000  ? 2000  ? December 14, 2009 3.28.2
iCab 1998  ? 1998  ? January 1, 2008 3.0.5[1]
KHTML October 2000  ? October 2000  ? August 4, 2009 4.3
Presto November 13, 2002 1.0 (Opera 7.0 beta 1) January 28, 2003 1.0 (Opera 7.0) June 3, 2009 2.2.15
Prince XML April, 2003 1.0 April, 2003 1.0 October, 2009 7.0
XEP 1999 fo2pdf December, 2009 4.17
Robin April 27, 2000 1.32 April 27, 2000 1.32 August 24, 2009 4.2.10
Tasman March 27, 2000 0 March 27, 2000 0 May 11, 2004 1.0
Trident April 1997 I October 1997 I March 19, 2009 4.0
WebKit January 7, 2003 48 June 23, 2003 85 - SVN version only

Operating system support

The operating systems the engines can run on without emulation.

Engine Windows Mac OS X Linux BSD Unix
Gecko Yes Yes Yes Yes Yes
GtkHTML Yes Yes Yes Yes Yes
iCab No Template:Terminated (3.03)[1] No No No
KHTML Yes Yes Yes Yes Yes
Presto Yes Yes Yes Yes Yes
Prince XML Yes Yes Yes Yes No
XEP[2] Yes Yes Yes Yes Yes
Robin Yes No No No No
Tasman No Yes No No No
Trident Yes Dropped (4.0) No No Dropped (5.0)
WebKit Yes Yes Yes Yes Yes

WebKit notes

Linux, Unix, Windows, and Mac OS X support are also available with Qt 4.3 in the public WebKit SVN repository.


  1. 1.0 1.1 The iCab 4 browser uses the WebKit engine - iCab 3.0.5 was the final release of the Carbon (API)-based iCab engine "iCab 4 Abandons Support for the Classic Mac OS". Retrieved 2009-04-30. 
  2. XEP is written in Java, with a dedicated release line for Windows.

See also

pt:Anexo:Comparativo de motores de renderização
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