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A generic font family is given as the last substituion element.
Makes it possible substitute fonts is the proposed font is not available on the users system.
Font characters are defined in the CSS file through propertiesfont-family or font :
seriffont family. For example : font-family: Georgia, "Bookman Old Style", serif;.sans-serif font family. For example : font-family: Optima, "Trebuchet MS", sans-serif;.monospace font family. For example : font-family: Courier, monospace;.cursive and fantasy for joined glyphs or fantasy fonts.If the site uses CSS technology validate the style sheet with the W3C style sheet validator which warns of the absence os generic fonts. W3C CSS validator