Very few printers can print all the way to the edge of a page. Even
expensive commercial printers can't. Most printers have some amount of
nonprintable area along each edge of the page. If you see a
professionally printed page that has printing all the way to the page
edges, then it was probably printed onto oversize sheets of paper, and
then the oversize sheets were trimmed to their final size. A few newer
photo printers can print "borderless", and if you have one of those,
then you need to choose that option in File | Print | Properties.
