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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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About the <head>

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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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Vendor Prefixing

About Vendor Prefixing

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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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Packages

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HTML 

              
                <div class="container">
  <div class="description panel blue">
    <div><h1>"labelsDirectional" snapping sections</h1>
      <p>Scroll vertically to scrub the horizontal animation. It snaps to the sections based on which direction you're scrolling whereas the typical snap: "labels" would require you to drag past halfway to snap to the next section.</p>
      <div class="scroll-down">Scroll down<div class="arrow"></div></div>
    </div>
  </div>


  <section class="panel red">
    ONE
  </section>
  <section class="panel orange">
    TWO
  </section>
  <section class="panel purple">
    THREE
  </section>
  <section class="panel green">
    FOUR
  </section>
  <section class="panel gray">
    FIVE
  </section>

</div>



<header>
  <a href="https://greensock.com/scrolltrigger">
    <img class="greensock-icon" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/scroll-trigger-logo-light.svg" width="200" height="64" />
  </a> 
</header>
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CSS 

              
                .container {
  width: 600%;
  height: 100%;
  display: flex;
  flex-wrap: nowrap;
}
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JS 

              
                gsap.registerPlugin(ScrollTrigger);

let sections = gsap.utils.toArray(".panel"),
    count = sections.length - 1,
    duration = 1,
    tl = gsap.timeline({
      scrollTrigger: {
        trigger: ".container",
        pin: true,
        scrub: 1,
        snap: "labelsDirectional",
        end: () => "+=" + document.querySelector(".container").offsetWidth
      }
    });

// add a label at each section
sections.forEach((section, i) => tl.add("label" + i, i * (duration / count)));

tl.to(sections, {
  xPercent: -100 * count,
  duration: duration,
  ease: "none"
});
!
999px

Console