Style rule is: .sidebar { ... border: 1px solid black; ... } When resizing the browser, borders on one (apparently random) edge of the affected blocks will intermittently vanish and reappear; careful resizing will sometimes hide a border completely until browser is resized again. This is clearly incorrect, as the border width is specified in screen units.

Owen, what build are you using? Please always include that in bug reports. For what it's worth, I cannot reproduce this in Linux build 2002-10-22-04.

Windows "Everything and the kitchen sink" build of Mozilla 1.1 ( User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.1) Gecko/20020826 ). Want a screenshot?

No, I believe you that you see it... it would be great if you could possibly test with 1.2b....

What? Test with a test version? Why would I do that? Suitably chagrined,

No need to be chagrined. Just wanting to make sure the bug is still present and all. ;)

Yep, still present in 1.2b (Mac OS X), although this is a dupe of a dupe of a dupe that never got much attention anyway. It's a roundoff error not taking px sizes for what they are when calculating total width and rounding. I have the same problem at http://www.student.lu.se/~kin02ndo/, although I "solved" it by using 2px instead.

I think this is a duplicate of bug 176237, which is not specific to relative positioning. I do see the bug on my trunk Linux build from yesterday on the sidebars on the right side of the page (alternately the right or bottom borders). It would be helpful if someone could figure out exactly what the two testcases have in common and how to construct a simplified testcase... *** This bug has been marked as a duplicate of 176237 ***