f7723559_CSS_HTML_XHTML_Reference_Book__Description_and_notes
[Property/Values] width either a length, percentage, auto, or inherit [Description and notes] 
for setting the width of an element initial value: auto; may not be applied to non-replaced inline elements, table rows, or row groups; not inherited; percentages refer to width of containing block
CSS HTML XHTML Reference Book
Description and notes