Parsoid/Broken wikitext tar pit

This page lists the baddest, hardest and least rewarding broken wikitext snippets we have come across that are really not worth tackling unless you feel very masochistic. Even then, it might actually be a bad idea to tackle this as it would create a lot of implementation complexity for little gain. We also have techniques like selective serialization to hide these issues under the rug. You have been warned!