Intersection observer API

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// Create a new observer object and pass in the entires/targeted DOM element(s)this.observer = new IntersectionObserver((entries) => {  // Loop through teh entries, if an entry has intersected the viewport add a class  entries.forEach((entry) => {    if (entry.isIntersecting) {      entry.target.classList.add("entered")      // Once the class is added we no longer need to observe the element      this.observer.unobserve(entry.target)    }  })})// The entry/DOM element to be targeteddocument.querySelectorAll(".fade-on-scroll").forEach((el) => {  this.observer.observe(el)})// Create a new observer object and pass in the entires/targeted DOM element(s)this.observer = new IntersectionObserver((entries) => {  // Loop through teh entries, if an entry has intersected the viewport add a class  entries.forEach((entry) => {    if (entry.isIntersecting) {      entry.target.classList.add("slide-entered")      // Once the class is added we no longer need to observe the element      this.observer.unobserve(entry.target)    }  })})// The entry/DOM element to be targeteddocument.querySelectorAll(".slide-on-scroll").forEach((el) => {  this.observer.observe(el)})