When applying a margin-top value to a table that is wrapped in a div with a border, the border does not apply around the margin space. (See the reduction below) Also see http://code.google.com/p/chromium/issues/detail?id=11567
Created attachment 30399 [details] reduction of issue 25828 (test reduction)
I can't see the bug here. Please re-open if there is still an issue.