Hint: 'hyphen'. 
#!/usr/bin/perl

use strict;
use warnings;
use CGI qw/:html4/;

my $q = CGI->new;
print $q->start_html(-lang => 'en-GB',
    -dtd => ['-//W3C//DTD HTML 4.01//EN', 
    'http://www.w3.org/TR/html4/strict.dtd']);

[download]

In reply to Re^4: cgi.pm -import strict html4 address into html4 strict dtd header by Khen1950fx
in thread cgi.pm -import strict html4 address into html4 strict dtd header by Don Coyote

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