Intersection Observer to check if Elem is intersecting

IntersectionObserver.js

/* ===
    Intersection Observer API 
    Note: Use to do something when elem comes into viewport, among other things.
    https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API
===*/
let options = {
    rootMargin: '0px',
    threshold: 1.0
  }

let callback = (entries, observer) => {
    entries.forEach(entry => {
        // Each entry describes an intersection change for one observed
        // target element:
        //   entry.boundingClientRect
        //   entry.intersectionRatio
        //   entry.intersectionRect
        //   entry.isIntersecting
        //   entry.rootBounds
        //   entry.target
        //   entry.time
        if(entry.isIntersecting) {
            console.log("Entry is intersecting");
            //do whats needed when elem is in view
        }
    });
};

const observer = new IntersectionObserver(callback, options);
  
let target = document.querySelector('.statsContainer');

observer.observe(target);