Animation Timing Function

• default(ease)
• ease-in
• ease-out
• ease-in-out
• linear
• step-start
• step-end
• steps(n, jump-start)
• steps(n, jump-end)
• steps(n, jump-none)
• steps(n, jump-both)
• steps(n, start)
• steps(n, end)
• cubic-bezier(p1, p2, p3, p4)

MDN reference