I tried with repl => "localhost:port" and I get same mixup. Somehow when $html = $mech->content happen in each fork it get confused and mix up all the $html.

This make it so my temporary sanitized html files have wrong document element mixed in.

Since this happen *in* the fork I guess I misunderstand when you say do way before the fork! :)

PS) I forgot to mention this inside a *nested* fork, if that matter.