def setup
  background(220)

  v1 = createVector(1, 0, 0)
  v2 = createVector(0, 1, 0)
  cross = P5Vector.cross(v1, v2)

  div = createDiv("cross: [#{cross.x}, #{cross.y}, #{cross.z}]")
  div.position(10, 10)
  div.style('font-size', '14px')
  div.style('width', '100px')
end