html - Multiple fonts in Font-Family property?

Question

In the command

<span style="font-family: arial,helvetica,sans-serif">
   <font size="1">
       [Country]
   </font>
</span>

Why are there multiple fonts in the font-family property?

Does it mean that if the arial font is not installed so it will goto helvetica?

Answer 1

Yes.

The font-family property can hold several font names as a "fallback" system. If the browser does not support the first font, it tries the next font.

From: http://www.w3schools.com/cssref/pr_font_font-family.asp

And as good practice:

Start with the font you want, and always end with a generic family, to let the browser pick a similar font in the generic family, if no other fonts are available.