Created attachment 302715 [details] testcase All the borders in this testcase are specified as 2px, but the bottom and right edges of the border-collapse table look like they're 3px wide.
I see this on mac, but not on Windows or Linux.
I see the problem with the testcase at some zoom levels on Windows. Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9pre) Gecko/2008061305 Minefield/3.0pre ID:2008061305
Ah, I also see it when zoomed in 1 level on Linux. Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9pre) Gecko/2008061204 Minefield/3.0pre. Platform / OS --> All/All.
OS: Mac OS X → All
Hardware: PC → All
See also bug 381564, which looks like it could be the same underlying problem.
Summary: border-collapse makes table border width incorrect/inconsistent → [BC] border-collapse makes table border width incorrect/inconsistent
Bug 895096 perhaps is the root problem.
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