Property Reference - CSS Reference - page 269

Name
visibility
Values:
visible | hidden | collapse
Initial value:
inherit
Applies to:
All elements
Inherited:
No
Computed value:
Same as declared value
Description:
Defines whether the element box generated by an element is rendered. This means authors can
have the element take up the space it would ordinarily take up, while remaining completely
invisible. The value collapse is used in tables to remove columns or rows from the table's
layout.
Examples:
ul.submenu {visibility: hidden;}
tr.hide {visibility: collapse;}