text: export function isElementInViewport(el) {
      if (typeof jQuery === "function" && el instanceof jQuery) {
          el = el[0];
      }
  
      var rect = el.getBoundingClientRect();
  
      return (
          rect.top >= 0 &&
          rect.left >= 0 &&
          rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
          rect.right <= (window.innerWidth || document.documentElement.clientWidth)
      );
  }