CGI::Pretty − module to produce nicely formatted HTML code
It will be removed from the CGI distribution in a future release, so you should no longer use it and remove it from any code that currently uses it.
For now it has been reduced to a shell to prevent your code breaking, but the "pretty" functions will no longer output "pretty" HTML.
HTML::HTML5::Parser + HTML::HTML5::Writer + XML::LibXML::PrettyPrint:
start_tags => 'force',
end_tags => 'force',
XML::LibXML::PrettyPrint−>new_for_html( indent_string => "\t" )
HTML::HTML5::Parser−>new−>parse_string( $html_string )
Marpa::R2::HTML (see the html_fmt script for examples)