transition-timing-function

Selector	Style	Variables Required
`.ease`	`transition-timing-function: var(--ease)`	`--ease`
`.ease-linear`	`transition-timing-function: linear`	-
`.ease-in`	`transition-timing-function: var(--ease-in)`	-
`.ease-out`	`transition-timing-function: var(--ease-out)`	-
`.ease-in-out`	`transition-timing-function: var(--ease-in-out)`	-
`.ease-initial`	`transition-timing-function: initial`	-