CSS in Action Invisible Content Just for Screen Reader Users   A
woman hides behind her hands.There are occasional instances
where content should be made available to screen reader users,
but hidden from sighted users. In most cases, if content
(particularly content that provides functionality or
interactivity) is important enough to provide to screen reader
users, it should probably be made available to all users. Cases
where verbose cues or instructions are provided only for screen
reader users are most likely a reflection of poor design and
accessibility. However, there are a few cases where information
is apparent visually, but may not be apparent to screen reader
users. In these cases, it may be appropriate to mark-up content
in a way that it is read by a screen reader, but invisible to
sighted users.  Techniques for hiding text   visibility: hidden;
and/or display:none;    As above, because an element with no
height or width is removed from the flow of the page, most
screen readers will ignore this cont