I see no problem 
#!/usr/bin/perl --
use strict;
use warnings;

use WWW::Scripter;
my $w = WWW::Scripter->new;
$w->use_plugin('JavaScript');

#~ http://www.w3schools.com/JS/js_cookies.asp
#~ http://www.w3schools.com/JS/tryit.asp?filename=tryjs_cookie_usernam
+e
#~ http://www.w3schools.com/JS/tryit_view.asp?filename=tryjs_cookie_us
+ername

$w->set_prompt_function( sub { 'teh usernaem ' } );
$w->get('http://www.w3schools.com/JS/tryit_view.asp?filename=tryjs_coo
+kie_username');
print $w->cookie_jar->as_string, "\n\n";
print $w->document->body->as_text;
__END__

Set-Cookie3: ASPSESSIONIDCARTDDCR=EFEIMDHAHLJNFCHKOGLODEKM; path="/"; 
+domain=www.w3schools.com; path_spec; discard; version=0
Set-Cookie3: username=teh%20usernaem%20; path="/JS"; domain=www.w3scho
+ols.com; expires="2012-03-15 16:43:55Z"; version=0

[download]

In reply to Re^7: WWW Mechanize and JavaScript Cookie by Anonymous Monk
in thread WWW Mechanize and JavaScript Cookie by saintex

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