http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54973
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-10-18 13:26:49 UTC --- Here's a rubbishy mock up misusing <fieldset> and an existing CSS class, but it makes it much easier to notice http://www.kayari.plus.com/gcc/enter_bug.cgi-1.html