Does anyone know if Mozilla 5/NN6 can handle negative z-index values? I've tried to figure out if the disappearing elements is due to another opaque element/thing (body {background-color:transparent} ). None of my w3/mozilla queries (http://www.mozilla.org/status/2001-03-28.html) have shed any light so thought I should ask you experts. thank you, Jim PS Mozilla milestone 0.9.2