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    # Set up a callback that collect image links
    my @imgs = ();
...
        return if $tag ne 'a';  # we only look closer at <img ...>
        push(@imgs, values %attr);
    };

    return if $tag ne 'img';
    push(@imgs, $attr{'src'});

    return if $tag ne 'a';
    push(@imgs, $attr{'href'});

    @imgs = map { $_ = url($_, $base)->abs; } @imgs;

    @imgs = map { $_ = url($_, $base)->abs->as_string; } @imgs;