CSS how to position element in half height (vertical 50%) -

CSS how to position element in half height (vertical 50%) -

i'm looking forwards build tooltip positioned next element. it's easy set on , under in center of element. there way vertically?

for purpose, height of element known & height of tooltip not. , tooltip can kid of element.

but, i'm curious how when both heights unknown.

using css & jquery-

css .div{ top:50% } jquery var divheight = $(.div).height() / 2; $(.div).attr('style','margin-top:-'+divheight+'px;');

css height vertical-alignment