Man pages matching name html::formattext::w3m in section 3pm:

HTML::FormatText::W3m.3pm.en	debian 10 / libhtml-formatexternal-perl
HTML::FormatText::W3m.3pm.en	debian 11 / libhtml-formatexternal-perl
HTML::FormatText::W3m.3pm.en	debian 12 / libhtml-formatexternal-perl