Look at the assertion at the very bottom of the quoted test page: http://www.bath.ac.uk/%7Epy8ieh/internet/eviltests/htmlbodyrendering4.html Namely, the white bit that reads: > NOTE! There should be exactly 8 pixels between the bottom border of this > paragraph and the bottom border of the BODY element. The bottom border > of this paragraph should also be 8 pixels wide. The first time the page is displayed, the gap is only 4 pixels. After a reflow, the gap grows to the correct 8 pixels.

*** Bug 3663 has been marked as a duplicate of this bug. ***

Transfering info from bug 3663 to this bug. In 3663, peterl said: > This is a reflow problem where the body frame is not respecting > the bottom margin of the last child during initial flow. Changing the title to match that.

Bug #3663 has been marked a duplicate of this one. This is the URL used for that bug. It's just another view of the same problem with larger measurement contrasts: http://slip/projects/marvin/bugs/bug_margin_bottom_value.html

This has nothing to do with platform parity, so I'm removing the [PP] marker

Exactly the same problem occurs with margin-top and the first element. Here is a test case: http://www.bath.ac.uk/%7Epy8ieh/a/internet/projects/mozilla/firsttopmargin.html See bug 1583.

Fixed.

Using 4/8 build in Viewer, verified fixed.