Also called vertical slabs this was added in the snapshot version 15w43a. Take a chisel, sneak and right click a mod slab. It will flip and go vertical. Click it again to change the orientation. This only works on the mod slabs, not the normal ones. You can only do this if the slab is on the bottom half of a block, not on the upper half.
MCE himself uploaded a gif showing the wall slabs.
This page was last edited on 20 June 2017, at 18:36.
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