For want of a pica

You see those little box-like things to the right? The ones marked "Recent Posts" and "Miniblog"? They're supposed to be tabs. Meaning the base-line marking the "page" to which each is notionally attached does not cross the front tab (the white one), but does cross the back tab (the grey one). That's how it's supposed to look. That's how it does look, in Safari and Firefox. But in OmniWeb and Camino, the line crosses both, because of a difference of 1px in where they place the various parts of the tabs in relation to one another. To make matters weirder, when I threw away my preference file for Safari, I found the same thing - yet it reverted to form when I put the same preference file back in its folder. Of course, the whole page has gone to hell in Opera and Internet Explorer. And I've no idea what it looks like in any non-Mac browswer. This is ridiculous. Why can't these browser people get it together?