If you believe you have found a bug, please post it in the Troubleshooting and Problems forum and a moderator will move it to this forum once it has been confirmed.
Uhm I don't see any forum like this - so I will post this report here.
It seems that both standard Add-Ons are not Valid XHTML 1.0 Transitional! The end tag for "table" is missing and some other stuff.
And no, whiteout them my side is fully XHTML 1.0 Transitional!