isElementInViewportByAxisY.js

/**
 * @author https://t.me/artemsites
 */
export default function isElementInViewportByAxisY(target) {
  let el = (typeof target === 'string') ? document.querySelector(target) : target
  const rect = el.getBoundingClientRect()
  return (
      rect.top <= 0
      || rect.bottom >= (window.innerHeight || document.documentElement.clientHeight)
  );
}