ayg wrote:

Horizontal rules are unrelated to the line under <h2>s, which is a border. The
border's width is determined by the width of the <h2>, which takes up the full
width of the page. The border is, of course, visible through the table, since
the table's background-color is transparent. This did change recently, when the
default setting for tables changed from white to the default default, namely
transparent. I've now specified that the table should be white, as it was
presumably intended to be. Infobox-like tables should generally have their
background specified, since transparency is undesirable for them.

Regardless, this isn't so much a software bug as a content bug: bad CSS will
produce bad results. I'll mark this as INVALID.