No.
Since $self is a blessed hashref, you can always use it, but be careful (a safe bet would be $$self{"\0_my_extra_args"} )
What exactly are you attempting to do?
Maybe you'd be better off using HTML::TokeParser::Simple.

update: Ah, I see. Are you going to be handling forms? I still say go with HTML::TokeParser::Simple, or possibly my HTML::LinkExtractor ;)

update: Look, this is interesting ;)

use JavaScript::SpiderMonkey;

my $jS = JavaScript::SpiderMonkey->new();

# Initialize Runtime/Context
$jS->init();


# create a new object, and set a method
my $document = $jS->object_by_path("document");

$jS->function_set("write", \&Write , $document);
$jS->function_set("writeln", \&WriteLn , $document);
$jS->property_by_path("document.location.href");


# Execute some code
my $rc = $jS->eval(q[

    document.location.href = append("http://", "www.perlmonks.org");

    document.write("URL is ", document.location.href);
    document.writeln("\nURL is ", document.location.href);

    function append(first, second) {
         return first + second;
    }

]);

# Get the value of a property set in JS
my $url = $jS->property_get("document.location.href");
print "the $url is\n";

$jS->destroy();

sub Write {
    print for @_;
}

sub WriteLn {
    print for @_;
    print "\n";
}
__END__
URL is http://www.perlmonks.org
URL is http://www.perlmonks.org
the http://www.perlmonks.org is
[download]

____________________________________________________
** The Third rule of perl club is a statement of fact: pod is sexy.