transition-timing-function: LINEAR

linear

transition-timing-function: EASE

linear
ease

transition-timing-function: EASE-IN

ease
ease-in

transition-timing-function: EASE-OUT

ease-in
ease-out

transition-timing-function: EASE-IN-OUT

ease
ease-in-out

transition-timing-function: steps()

steps(2, start)
steps(2, end)

transition-timing-function: step-start / step-end

step-start
step-end