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  1. or download this
    <form>
    <input type="checkbox" name="passenger" value="somevalue" />
    <input type="submit" name=".submit" value="OK">
    </form>
    
  2. or download this
    use strict;
    use warnings;
    ...
    $set_value = $mech->value($target_field);
    $set_value = 'undef' unless defined $set_value;
    print "[2] value for $target_field: ($set_value)\n";
    
  3. or download this
    $ perl tick.pl http://localhost/form.html
    [1] value for passenger: (undef)
    [2] value for passenger: (somevalue)