Hi Perl_Love,
There are two separate things going on here:
First, class="a b" specifies that the anchor has two separate classes, named "a" and "b".
Second, the selector 'a.a b' means to select an element b (bold) that is a descendant of an a element (anchor) of class "a".
So to make your second example work, you could specify the selector to match an anchor that has both classes by chaining them, giving "a.a.b":
use Mojo::DOM;
my $dom = Mojo::DOM->new();
my $test2=$dom->parse('<a class="a b">2016-05-18</a>')->at('a.a.b')->t
+ext;
print "$test2\n";
__END__
2016-05-18
Hope this helps,
-- Hauke D
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