Hey,
I just spent a puzzling hour trying to track down a rendering bug with Safari 2 and Mac OS X Tiger. My child theme was displaying well, except when comments were opened. When I clicked the link to show comments, the page lost its left margin. Odd behavior.
Anyway, here's the fix:
body.singular.safari #wrapper { /* this is a hack for Safari on the Mac */
width: 692px;
margin: 10px;
padding: 8px;
background: #ffffff;
}
Here's the corrected page:
http://www.pratt-union.org/2006/07/23/stanley-fish-on-academic-freedom-july-23-2006/#comments
Once again, thanks to Thematic's dynamic body classes, I had an easy way to isolate the problem in CSS.