https://developer.mozilla.org/en/XULRunner seems to be the solution for how to embded Gecko aas an internal preview engine.
I found this one for embedding Chromium but I'm sure the Webkit in Chrome is not the same as the one in Chromium - http://code.google.com/p/chromiumembedded/ Or there is Chrome Frame for embedding Chrome somehow - http://src.chromium.org/viewvc/chrome/trunk/src/chrome_frame/test/perf/chrome_fr ame_perftest.cc?view=markup -- Carbonize <http://forum.pspad.com/read.php?2,57537,57544> PSPad freeware editor http://www.pspad.com
