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HTML

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div style="height: 50vh; background-color:gray"></div>
<div id="section">
  
  <div id="text1" class="myText">
    Text 1
  </div>
  
  <div id="text2" class="myText">
     Text 2
  </div>
  <div id="text3" class="myText">
     Text 3
  </div>

</div>

 <div style="height: 50vh; background-color:gray"></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;
}

.myText{
  position:absolute;
  top:50%;
  transform: translate(0, -50%);
  color:white;
  font-size:50px;
  opacity:0
}

#section{
  position:relative;
  height:50vh;
  widht:100vw;
  background-color:black;
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger, Observer);
console.clear();

let tl1 = gsap.timeline();
tl1.to("#text1", {left:"50%", opacity:1, duration:4});

let tl2 = gsap.timeline();
tl2.to("#text2", {left:"60%", opacity:1, duration:4});

let tl3= gsap.timeline();
tl3.to("#text3",  {left:"70%", opacity:1, duration:4});

// drop each timeline into a master so that we can add a pause inbetween
let masterTL = gsap.timeline({
  onReverseComplete: () => {
    scrollObserver.disable();
    sectionST.scroll(sectionST.start);
  },
  onComplete: () => {
    scrollObserver.disable();
    sectionST.scroll(sectionST.end);
  },
  paused: true
});
masterTL.add(tl1, "label1")
  .addPause()
  .add(tl2, "label2")
  .addPause()
  .add(tl3, "label3");

// create an observer that freezes the scroll and plays/reverses the master timeline based on scroll direction
let scrollObserver = Observer.create({
  type: "wheel,touch",
  wheelSpeed: -1,
  debounce: false,
  dragMinimum: 2,
  preventDefault: true,
  onUp: () => masterTL.play(),
  onDown: () => masterTL.reverse(),
  onEnable(self) {
    // when enabling, we should save the scroll position and freeze it. This fixes momentum-scroll on Macs, for example.
    let savedScroll = self.scrollY();
    self._restoreScroll = (e) => self.scrollY(savedScroll)
    document.addEventListener("scroll", self._restoreScroll, {passive: false});
  },
  onDisable(self) {
    document.removeEventListener("scroll", self._restoreScroll);
  }
});
scrollObserver.disable();

let sectionST = ScrollTrigger.create({
  trigger: "#section",
  start: "bottom center",
  end: "+=300",
  onEnter: self => {
    self.scroll(self.start + 1);
    masterTL.progress() < 1 && scrollObserver.enable();
  },
  onEnterBack: self => {
    self.scroll(self.end - 1);
    masterTL.progress() > 0 && scrollObserver.enable();
  },
  onLeave: () => scrollObserver.disable(),
  onLeaveBack: () => scrollObserver.disable(),
  markers: true,
  pin: true
});
!
999px

Console