`keyframeSelectorNotation`

Control whether to use percentage or keyword (from and to) notation as keyframe selectors.

Possible options:

null: Keyframe selector notation will be kept as-is.
"keyword": Use keyword notation. This only affects 0% and 100%. For other percentage values, they will be kept as-is.
"percentage": Use percentage notation.

Default option is null.

Example for `null`


@keyframes foo {
  from {}
  50% {}
  100% {}
}

Example for `"keyword"`


@keyframes foo {
  from {}
  50% {}
  to {}
}

Example for `"percentage"`


@keyframes foo {
  0% {}
  50% {}
  100% {}
}