-webkit-animation-delay
ease
linear
ease-in
ease-out
ease-in-out
cubic-bezier(0.2,0.7,0.9,0.4)
cubic-bezier(0.6,-0.5,0.4,1.4)
steps(4,end)
steps(4,start)
Ctrip携程2014 - Ctrip UED