perl -MHTTP::Tiny -MMIME::Base64 -e 'print qq~<link href="data:image/x-icon;base64,~, encode_base64(HTTP::Tiny->new->get($ARGV[0])->{content},""), qq~" rel="icon" type="image/x-icon">~||die"something went wrong"' https://perlmonks.org/favicon.ico