f7723559_CSS_HTML_XHTML_Reference_Book__Description_and_notes
[Property/Values] size either individual lengths for width and height, a single value for both width and height, landscape, portrait, auto, or inherit. [Description and notes] 
for determining the size of the printing area in a defined page initial value: auto; may only be used within an @page rule
CSS HTML XHTML Reference Book
Description and notes