https://lists.w3.org/Archives/Public/public-html-bugzilla/2010Apr/0062.html
[Bug 9286] marginheight and topmargin are missing from the list of obsolete elements from...
https://bugzilla.mozilla.org/show_bug.cgi?id=9258
9258 - [FIX] topmargin="0" leftmargin="0" not applied
VERIFIED (attinasi) in Core - Layout. Last updated 2001-09-05.
fixapplied