IntersectionObserver

Creates a new intersection observer.

observer =
  IntersectionObserver.new("50px", 0.1,
    (intersectionRatio : Number) {
      if (intersectionRatio == 1) {
        Debug.log("Fully visible!")
      } else {
        Debug.log("Not fully visible!")
      }
    })

Observes the given element.

Unobserves the given element.