/usr/lib/x86_64-linux-gnu/perl5/ is in libhtml-parser-perl 3.72-3build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/5.26/
/usr/lib/x86_64-linux-gnu/perl5/5.26/HTML/
/usr/lib/x86_64-linux-gnu/perl5/5.26/HTML/Entities.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/HTML/Filter.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/HTML/HeadParser.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/HTML/LinkExtor.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/HTML/Parser.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/HTML/PullParser.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/HTML/TokeParser.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/HTML/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/HTML/Parser/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/HTML/Parser/Parser.so