When I rebuilt this site earlier, one page failed validation. It was easy to
see why, since the error message was
Bad value footnote for attribute rel on
element a: The string footnote is not a registered keyword. Someone had
reported it last year but
no-one had fixed it.
Seemed straightforward, so I pushed a fix which works for this site. If you’re here because you searched for the above error message, an update of blackfriday markdown should sort it out now. Looks like other markdown → html generators have the same issue - I don’t use them, but the fix should be just as easy.
When will it be fixed? Sooner, with your help.