When I landed bug 368247, a few reftests failed on the mac tinderbox: bugs/84400-2.html bugs/210876-1.html bugs/339289-1.html bugs/362901-1.html Visually all of these look identical; it seems that they all use a <fieldset>, which is rendered using a 2px groove style. In one of them, the top left and bottom right corner pixels (2 pixels total) have a color value 1 RGB value higher than the reference rendering. I have no idea why; the CSS looks identical in all cases. I can't investigate this right now, but I'll take a look when I have a mac next week; marking these as xfail for now.

Downgrading this to wanted; the issue is that Quartz ADD has a rounding or other calculation error that's causing it to calculate a color that's 1 off the correct value. Visually this isn't noticeable, and it only affects pixels where ADD is being applied (corners of some border styles).

Seems to have been fixed by bug 382092.

These all seem to pass with latest trunk.