In the i3 documentation I find the commands
split horizontal and
split vertical, which will create a branch in the container tree with horizontally or vertically split subcontainers.
However, there is no
split stacked or
split tabbed. To get the same effect, i would have to do Alt+H + Alt+S.
I think that this would be a both usefull and logical feature to have. For myself, I added the stacking version of it using
bindsym Mod1+z split horizontal, layout stacking
But still, I wonder, if there is a design reason for not having this?