Thank you, Corion, for your trustworthy help, as always.
This snippet in the OP:

$res = $sel->get_eval( q{ WebDriver driver = ((WebDriverBackedSelenium
+) selenium).getWrappedDriver();
   driver.manage().window().setSize(1040,768);} );

[download]

does define "driver" ok.

As you can see, when replacing it with:

my $js = q{((WebDriverBackedSelenium) selenium).getWrappedDriver().man
+age().window().setSize(1040,720);} ;
 $sel->get_eval($js):

[download]

(as suggested in Matthias' comment here: http://stackoverflow.com/questions/24585497),
it produces the error:

 missing ) in parenthetical

This is typically a javascript error not pointing to a missing parentheses, but instead to invalid javascript, for some reason (sometimes: bad string representation)
(see Slaks' comment here: http://stackoverflow.com/questions/18242512).

This leads me to think that somehow, the Perl WWW::Selenium module is not passing on right the javascript string to the Selenium server.

See here, too: http://geekandpirate.wordpress.com/2010/12/11/missing-in-parenthetical/

In reply to Re^2: Selenium: Trying to resize window from Perl: getting a mysterious JavaScript error by HelenCr
in thread Selenium: Trying to resize window from Perl: getting a mysterious JavaScript error by HelenCr

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