Comment # 57 on bug 904015 from Petr Gajdos

(In reply to Vadim Krevs from comment #55)
> $ fc-match -v sans:size=8 | grep 'family\|hint\|alias'
> Fontconfig warning: "/home/vadymk/.config/fontconfig/fonts.conf", line 37:
> Having multiple values in <test> isn't supported and may not work as expected
> Fontconfig warning: "~/.fonts.conf", line 37: Having multiple values in
> <test> isn't supported and may not work as expected
>         family: "Arial"(s)
>         familylang: "en"(s)
>         antialias: False(w)
>         hintstyle: 3(i)(w)
>         hinting: True(w)
>         autohint: False(w)
>         force_hintstyle: "none"(w)
>         force_autohint: False(w)
>         search_metric_aliases: True(w)

This looks correctly to me: for size=8, antialias is of, autohinting not
forced, hintstyle full, hinting true. But note you have Arial instead of Tahoma
standing for sans-serif.