WebKit fails to display SVG in WICD test case http://www.w3.org/2004/CDF/TestSuite/WICD_CDR_WP1/test-SVG-DOM-events.xhtml It appears and then immediately disappears. Not sure why. This might be related to/caused by bug 16490.
bug 16490 makes this really hard to debug.
The stated problem seems gone nowadays.