So I have this web page that loads into an iFrame. It does this on purpose, so the parent page can check that the child server is actually up. That way, if that server is down, you'll get an offline page right away, rather than waiting and waiting for a time-out. And also I do it this way so it's less confusing for people, as the child server has to run on a non-standard TCP/IP port.
So on to the issue. In safari, and only safari, the web page that loads into the iframe get's it's fonts "thinned". It's very strange. The font is not bold, it's normal. And in other browsers, it's normal even in the frame. But in safari, when you load the page directly, the font is normal. But when you load in the iframe, the font gets extra thinned.
Here's a sample. Safari on the left, FireFox on the right. As I said, this isn't just a matter of "different browsers, different font rendering". Pages that are not in an iframe DO look the same across browsers. It's only the iframe that causes the anorexic type.
If you want to check this effect out in person, just click the 'ColdMac' link in my sig.