base:
  x: .25 in
  y: 0.751in

example:
  extends: base
  x: += 5mm # we can mix units on adding
  y: -= 5mm
  width: 1.25in
  height: 300   # pixels

angled:
  x: 220
  y: 300
  width: 30
  height: 30
  angle: 100deg