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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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Adding Classes

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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

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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JavaScript

About JavaScript Preprocessors

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

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Babel includes JSX processing.

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HTML 

              
                <section class="section gradient-green"></section>
<section class="section titles-section">
  <div class="preface">
    <h1>Lorem ipsum dolor sit</h1>
    <p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Amet aliquam ad consequatur eos et accusamus nulla ratione. Voluptatum, harum inventore sed laborum culpa pariatur neque iusto eligendi dolore aliquam expedita!</p>
  </div>
  <div class="item">
    <div class="left"></div>
    <div class="center">
      <h1>Slide One</h1>
      <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Facilis tempore libero amet provident aspernatur quo officia ut possimus perspiciatis accusantium ullam, neque nostrum laborum labore repellat harum dolor eius! Nobis?</p>
      <p>Aliquam, at corrupti eum iure error quidem, id illo neque labore maxime est totam deserunt deleniti facere aperiam distinctio sapiente omnis nam perspiciatis magni. Consectetur blanditiis illum suscipit inventore laudantium!</p>
    </div>
    <div class="right"></div>
  </div>
  <div class="item">
    <div class="left"></div>
    <div class="center">
      <h1>Slide Two</h1>
      <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Facilis tempore libero amet provident aspernatur quo officia ut possimus perspiciatis accusantium ullam, neque nostrum laborum labore repellat harum dolor eius! Nobis?</p>
      <p>Aliquam, at corrupti eum iure error quidem, id illo neque labore maxime est totam deserunt deleniti facere aperiam distinctio sapiente omnis nam perspiciatis magni. Consectetur blanditiis illum suscipit inventore laudantium!</p>
    </div>
    <div class="right"></div>
  </div>
  <div class="item">
    <div class="left"></div>
    <div class="center">
      <h1>Slide Three</h1>
      <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Facilis tempore libero amet provident aspernatur quo officia ut possimus perspiciatis accusantium ullam, neque nostrum laborum labore repellat harum dolor eius! Nobis?</p>
      <p>Aliquam, at corrupti eum iure error quidem, id illo neque labore maxime est totam deserunt deleniti facere aperiam distinctio sapiente omnis nam perspiciatis magni. Consectetur blanditiis illum suscipit inventore laudantium!</p>
    </div>
    <div class="right"></div>
  </div>
  <div class="item">
    <div class="left"></div>
    <div class="center">
      <h1>Slide Four</h1>
      <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Facilis tempore libero amet provident aspernatur quo officia ut possimus perspiciatis accusantium ullam, neque nostrum laborum labore repellat harum dolor eius! Nobis?</p>
      <p>Aliquam, at corrupti eum iure error quidem, id illo neque labore maxime est totam deserunt deleniti facere aperiam distinctio sapiente omnis nam perspiciatis magni. Consectetur blanditiis illum suscipit inventore laudantium!</p>
    </div>
    <div class="right"></div>
  </div>
</section>
<section class="section gradient-blue"></section>
!

CSS 

              
                * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.section {
  width: 100%;
  min-height: 100vh;
  height: auto;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--color-just-black);
}

.titles-section {
  display: block;
  background-color: var(--color-surface-white);
}

.preface {
  width: 60%;
  margin: 0 auto;
  padding: 50px 0;
}

.preface h1 {
  margin-bottom: 25px;
  text-align: center;
}

.preface p {
  margin: 0;
}

.item {
  width: 100%;
  height: 70vh;
  display: flex;
  background-color: var(--color-surface-white);
  position: relative;
  border-top: 1px solid var(--color-just-black);
}

.left,
.right {
  width: 20%;
}

.item .center {
  display: block;
  width: 60%;
}

.item .center h1,
.item .center p {
  margin: 0;
  padding: 15px 0;
}
!

JS 

              
                console.clear();

const items = gsap.utils.toArray(".item");
const arrLength = items.length - 1;

items.forEach((item, i) => {
  const title = item.querySelector(".center h1");
  if (i < arrLength) {
    ScrollTrigger.create({
      trigger: item,
      start: "top top+=" + title.clientHeight * i,
      end: "top top+=" + title.clientHeight * arrLength,
      endTrigger: items[arrLength],
      pin: true,
      pinSpacing: false,
      markers: { indent: 180 * i },
      id: i + 1
    });
  }
});
!
999px

Console