= [ none | ] || || ||

= all |

= linear | | |

= linear( )

= ease | ease-in | ease-out | ease-in-out | cubic-bezier( , , , )

= step-start | step-end | steps( , ? )

= [ ]#

= jump-start | jump-end | jump-none | jump-both | start | end

= && ?

= {1,2}