1. css property: animation-timing-function: `jump-` keywords for `steps()`

  2. css property: transition-timing-function: `jump-` keywords for `steps()`

  3. types: `<easing-function>`: `steps()` with `start`, `end` or no direction

  4. types: `<easing-function>`: `steps()` with `start`, `end` or no direction: `jump-` keywords for `steps()`