You need
.abc,.ab {
display: none;
}
#f:hover ~ .ab {
display: block;
}
#s:hover ~ .abc {
display: block;
}
#s:hover ~ .a,
#f:hover ~ .a{
display: none;
}
Updated demo at http://jsfiddle.net/gaby/n5fzB/2/
The problem in your original CSS was that the ,
in css selectors starts a completely new selector. it is not combined.. so #f:hover ~ .abc,.a
means #f:hover ~ .abc
and .a
. You set that to display:none
so it was always set to be hidden for all .a
elements.