They could have defined `z-index: omega` to be on top of all other natural number z-indices. And they we can have `z-index: omega+1`, `z-index: omega+2`, ..., `

They could have defined `z-index: omega` to be on top of all other natural number z-indices. And they we can have `z-index: omega+1`, `z-index: omega+2`, ..., `z-index: omega*2`, `z-index: omega*2+1`, ..., `z-index: omega*3`, ..., `z-index: omega*omega`, ..., and so on and so forth. And then maybe next year they will propose a new syntax for setting z-index to epsilon zero.