The slant keyword is used to designate whether the element is in italics or not. The value “italic” specifies italics; the value “upright” specifies roman type
The weight keyword is used to designate whether the element is in boldface or not. Possible values are “light”, “normal”, and “bold”. The WWP does not currently use this keyword at all; boldface type is very rare in WWP texts (in fact it is not clear whether it appears at all) and encoders should be very cautious about assuming that text is in boldface. It should only be specified where a direct comparison can be made between the element in question and other text of the same size and font, to be certain that the appearance of added weight is not simply the result of a larger type size.