In the command
[Country]
Yes, the font-family indicates the font priority. If the browser does not support the first font, it tries the next font. If the browser support arial, the style font will be arial. The browser use helvetica if does not support arial. You can use the name of a font-family (times, courier, arial, ...) or the name of a generic-family (serif, sans-serif, cursive, "monospace", ...).