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HTML

              
                <h1>Infinite Scroll in both directions</h1>
<div class="intro" id="intro">Intro</div>
<div class="content">
  <h6>Further Content</h6>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
<div class="outro" id="outro">Outro</div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Signika+Negative:300,400&display=swap');

body { 
  font-family: "Signika Negative", sans-serif; 
  font-weight: 300;
  margin: 0;
  padding: 0 20px;
}

.intro {
  height: 20em;
  border: 10px solid red;
  background-color: red;
}

.content {
  height: 200vh;
  border: 10px solid blue;
  background-color: lightblue;
}

.outro {
  height: 100vh;
  border: 10px solid green;
  background-color: lightgreen;
}
              
            
!

JS

              
                // import * as Vue from "https://cdn.skypack.dev/vue";
// gsap.to()... infinity and beyond!
// For more check out greensock.com

let isLooping = false 
const introScrollTrigger = ScrollTrigger.create({
 // if (introscrollTrigger !== null) return
        markers: true,
        // trigger has to span complete element that is used as trigger (start + end markers). use delay to correctly instantiate them
        trigger: "#intro",
        // start + top values here are the scroller-start and scroller-end markers: mark where the trigger gets executed. change these to change positions and timing
        // if left end of item touches left end of scroller (viewport by default) + offset to move start more to center
        start: '1% top',
        // start: 'top top+=' + this.scrollerOffset,
        // position of trigger meets position of scroller
        end: 'bottom bottom',
        onEnterBack: () => {
            if(!isLooping) {
            window.scrollTo(0, document.body.scrollHeight)
          }
          isLooping = !isLooping
        }
      })

const outroScrollTrigger = ScrollTrigger.create({
  // if (outroscrollTrigger !== null) return
        markers: true,
        // trigger has to span complete element that is used as trigger (start + end markers). use delay to correctly instantiate them
        trigger: "#outro",
        // start + top values here are the scroller-start and scroller-end markers: mark where the trigger gets executed. change these to change positions and timing
        // if left end of item touches left end of scroller (viewport by default) + offset to move start more to center
        start: 'top top',
        // start: 'top top+=' + this.scrollerOffset,
        // position of trigger meets position of scroller
        end: 'bottom bottom',
        onLeave: () => {
          if(!isLooping) {
            window.scrollTo(0, 0)
          }
          isLooping = !isLooping
        }
      })
              
            
!
999px

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