We added 
                perspective:            ${MASTER.observerZ}px;
                perspective-origin:     ${MASTER.perspectiveOrigin[ 0 ]}px ${MASTER.perspectiveOrigin[ 1 ]}px;

to envelope, but IE and FF(Windows) still fail.

IE hovers wrong sprites.
IE has gaps between sprites, and FF cannot show correct intersection of sprites from different carousels.
FF 54.0.1

IE: Microsoft Edge 38.14393.1066.0
Microsoft EdgeHTML 14.14393