A generic font family should be the last item in the list of font family names. Generic family names are keywords and must not be quoted. Generic font families are a fallback mechanism, a means of preserving some of the style sheet author's intent when none of the specified fonts are available. Font family names containing whitespace should be quoted. For example, "Times" and "Helvetica" are font families. When a font is only available in some styles, variants, or sizes, those properties may also influence which font family is chosen. Rather, font selection is done one character at a time, so that if an available font does not have a glyph for a needed character, the latter fonts are tried. Font selection does not stop at the first font in the list that is on the user's system.
The font-family property specifies a list of fonts, from highest priority to lowest. This lets the browser select an acceptable fallback font when necessary. You should always include at least one generic family name in a font-family list, since there's no guarantee that any given font is available. It is often convenient to use the shorthand property font to set font-size and other font related properties all at once. The browser will select the first font in the list that is installed or that can be downloaded using a at-rule. Values are separated by commas to indicate that they are alternatives. The font-family CSS property specifies a prioritized list of one or more font family names and/or generic family names for the selected element.
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