In Midori 0.2.6 (WebkitGTK+ 1.2.1), the TypeKit fonts used on http://wisser.me are not rendered. As described in comment #2 on bug 41091 (https://bugs.webkit.org/show_bug.cgi?id=41091#c2), the font size is specified in CSS.
Created attachment 61714 [details]
Demonstration of the issue.
On elementaryOS pre-alpha (derived from Ubuntu 10.04) in Midori 0.2.6.
Jonas, I think this may be corrected in SVN master. Is it possible for you to test using a recent build?
(In reply to comment #2)
> Jonas, I think this may be corrected in SVN master. Is it possible for you to test using a recent build?
Unfortunately, I'm no longer running elementary or any other Linux, and there's no Mac version, so no. Sorry.
I believe this issue is fixed, so I'm going to close it. Anyone having font issues with WebKitGTK+ please file a new issue and CC me.