OptionaldelaySeconds to wait before starting.
OptionaldurationSeconds the motion lasts. Required unless spring supplies one.
OptionaleaseEasing curve, by name or function. Mutually exclusive with spring.
Value before the track starts.
OptionalspringSpring physics instead of an easing. Supplies its own duration.
OptionalstaggerExtra delay per item index, for staggering a row of elements.
Value once it has finished.
A reusable animation: what to move between, when, and how.