It has finally happened. The tikzmark has burst its bonds and is loose upon an unsuspecting TeX public. We can only hope that they are spared the worst of it.
No-one, repeat no-one, should download it from CTAN unless they truly understand the consequences of using the tikzmark. There is a tikzmark support group for those who find themselves (ab)using it and who need help.
The \tikzmark macro burst onto the scene in a blaze of glory on TeX-SX. Since then, it has proved embarrassingly (to its original author) popular. The idea behind it is extremely simple: that the machinery underneath TikZ pro …