Is anyone aware of any issues with em sizing between Safari and Firefox? I'm trying to display something that at normal size is 1px, but I want it in em's so it will change with the fonts should they be resized. In Firefox I get the desired effect with 0.05em but in Safari it's 0.1em. If I use .05 it doesn't show at all in Safari and if I use .1 it looks silly in Firefox. I'm using Meyers css reset so it shouldn't be default setting differences should it? Any ideas?
My guess is, these browsers are starting at different default fonts. Which is actually good, because your users will come to you with various font defaults and various dpi's anyway. So, if you need something to be pixel-perfect, you might have to resort to pixels.