Works for me (using XML::XSH2):

And you're sure that's not an xsh2 function/feature?

Produces no output for me 

#!/usr/bin/perl --
use strict; use warnings; use XML::LibXML;

my $html = <<'__HTML__';
<html>
<head>
<title>Hello Firefox!</title>
</head>
<body>
<h1>Hello <b>World</b>!</h1>
<p id='paragraph'>Hello <b>WWW::Mechanize::Firefox</b> Goob bye</p>
</body>
</html>
__HTML__

my $dom = XML::LibXML->new(
    qw/ recover 2 /
)->load_html(
#~     string => \$html, ## BUG! scalar... not like load_xml
    string => $html,
);

local $\ = $/;

print for $dom->findnodes(q{ substring(//p,1,4) }); ## nada
print for $dom->findnodes(q{ //p }); ## paragraph

[download]

In reply to Re^3: Some issues with WWW::Mechanize::Firefox->xpath() method (xpath 1.0) by Anonymous Monk
in thread Some issues with WWW::Mechanize::Firefox->xpath() method by dfaure

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