Hi All,
I have figured out the solution to the first question.
We can indeed pass 2 html tags to find method when you are using mechanize package.Below is the code snippet to do so:-

foreach my $element ($mech->find('span','strong')) {
    my $attr_class=$element->attr('class')|| next;
    print Dumper($attr_class);
}
[download]

Fortunately the above snippet could yield an output.I however could not get an answer to the second question.