Man pages matching name devel::cover::report::html_subtle in section 3pm:

Devel::Cover::Report::Html_subtle.3pm.en	debian 10 / libdevel-cover-perl
Devel::Cover::Report::Html_subtle.3pm.en	debian 11 / libdevel-cover-perl
Devel::Cover::Report::Html_subtle.3pm.en	debian 12 / libdevel-cover-perl