Function isOffscreen

src/index.ts:134–139

* Determine if an element is fully outside of the current viewport. * @param el - Element to test

(el: Element)

 * @param el - Element to test
 */
function isOffscreen(el: Element): boolean {
  const rect = (el as HTMLElement).getBoundingClientRect()
  const vw = root?.clientWidth || 0
  const vh = root?.clientHeight || 0
  return rect.bottom < 0 || rect.top > vh || rect.right < 0 || rect.left > vw
}

/**
 * Observe this elements position.