User signatures, at least on enwiki, are continually introducing new Lint errors, for example due to the use of the `<font>` tag in @Tony1's [[ https://en.wikipedia.org/w/index.php?title=User_talk:Tony1&diff=prev&oldid=806770164 | edit ]] this morning (sorry, I just used your edit because I remembered your signature had a font tag in it). This is compounded by a Tidy issue, T25467 (see [[ https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)#Wikilink_font_colors | this discussion ]]), related to the nesting of links directly inside the font tag. Rather than stopping thousands of editors' signatures from being coloured, or having a bot clean up after every signature with a font tag, users' signatures could be manually modified on the server side ([[ https://www.mediawiki.org/wiki/Manual:User_properties_table | if it's possible? ]]) or some other automatic conversion could be done.