font-family : This property specifies a prioritized list of font familly names and/or generic family names.
font-style : The “font-style” property requests normal, italic, and oblique faces within a font family. Values have the following meanings: “normal” specifies a font that is classified as “normal” in the UA's font database, oblique specifies a font that is classified as “oblique” in the UA database, “italic” specifies a font that is classified as “italic” in the UA's font database. Fonts with Oblique, Slanted, or Incline in their names will tipically be labeled oblique in the font database. Fonts with Italic, Cursive, or Kursive in their names will tipically be labeled italic in the font database. Note that the value is inherited by the parent if no font-style is defined.
font-weight : The font-weight property specifies the weight of the font. Values have the following meaning : “100” to “900” these values form an ordered sequence, where each number indicates a weight that is at least as dark as its predecessor, “normal” is the same as 400, “bold” is the same as 700, “bolder” specifies the next weight that is assigned to a font that is darker that the inherited one, “lighter” specifies the next weight that is assigned to a font that is lighter than the inherited one. Note that the value is inherited by the parent if no font-weight is defined.
font-size : This property describes the size of the font when set solid. Note that the value is inherited by the parent if no font-size is defined. Values could be either an <absolute-size>, a <relative-size>, a <length> or a <percentage>. An <absolute-size> keyword refers to an entry in a table of font-sizes computed. Possible Values are : “xx-small”, “x-small”, “small”, “medium”, “large”, “x-large”, “xx-large”. <relative-size> keyword is interpreted relative to the table of font sizes and the font size of the parent element. Possible values are “larger” or smaller. A <lenght> value specifies an absolute font size. A <percentage> value specifies an absolute font size relative to the parent element's font size.