How to hide elements in css

{ display: none; /* does not occupy space, cannot be clicked / }
{ visibility: hidden; / occupies space, cannot be clicked / }
{ position: absolute; top: -999em; / does not occupy space, cannot be clicked / }
{ position: relative; top: -999em; / takes up space, cannot be clicked / }
{ position: absolute; visibility: hidden; / does not take up space, cannot be clicked / }
{ height: 0; overflow: hidden; / does not take up space, cannot be clicked / }
{ opacity: 0; filter:Alpha(opacity=0); / Occupy space, can be clicked / }
{ position: absolute; opacity: 0; filter:Alpha(opacity=0); / Do not occupy space, can be clicked / }
{
zoom: 0.001;
-moz-transform: scale(0);
-webkit-transform: scale(0);
-o-transform: scale(0);
transform: scale(0);
/ IE6/IE7/IE9 does not occupy space, IE8/FireFox/Chrome/Opera occupies space. Neither can be clicked /
}
{
position: absolute;
zoom: 0.001;
-moz-transform: scale(0);
-webkit-transform: scale(0);
-o-transform: scale(0);
transform: scale(0) ;
/ Does not take up space and cannot be clicked */
}