This document, when viewed on Netscape,
illustrates that when a form contains
a table with the align="left" attribute,
Netscape ignores form fields inside that table in the
tabbing order.
That is, on some versions of Netscape at least
(tested on Netscape 4.5 under WinNT),
tabbing in the first input field takes us to the submit button,
not the the other input field, which is unreachable via tabbing.
Strictly speaking, this might be called just an awful feature rather than a bug. The HTML specifications have rather vague rules for tabbing order.