Unknown property: 'place-self'

[bennypowers]

Given

#submit {
  grid-column: 2/3;
  place-self: end;
}

ide-css reports:

Unknown property: 'place-self'

place-self is widely supported:

https://developer.mozilla.org/en-US/docs/Web/CSS/place-self

Please add it to ide-css.

Thanks for publishing this project.