HTML::Lint is a pure-Perl HTML parser and checker for syntactic legitmacy.
 .
 The "weblint" script - provided in the separate package "weblint-perl" -
 is a wrapper around the HTML::Lint.
 .
 You can also look into Apache::Lint which is a mod_perl wrapper around
 HTML::Lint.
 .
 Finally, for those of you doing automated testing with Test::More and
 its brethren, Test::HTML::Lint lets you automate HTML checking.