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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.

Vendor Prefixing

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <head>
  <script src="https://unpkg.com/typeit@8.3.3/dist/index.umd.js"></script>
  <script src="https://unpkg.com/scroll-out/dist/scroll-out.min.js"></script>
</head>
<body>
  <div class="site-wrap">
    <section data-scroll>
      <h1 class="title">Scroll on down</h1>
      <p>
        Consectetur adipisicing elit. Tempore tempora rerum, est autem
        cupiditate, corporis a qui libero ipsum delectus quidem dolor at
        nulla, adipisci veniam in reiciendis aut asperiores omnis blanditiis
        quod quas laborum nam! Fuga ad tempora in aspernatur pariaturlores
        sunt esse magni, ut, dignissimos.
      </p>
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Voluptates,
        deserunt facilis et iste corrupti omnis tenetur est. Iste ut est dicta
        dolor itaque adipisci, dolorum minima, veritatis earum provident error
        molestias. Ratione magni illo sint vel velit ut excepturi consectetur
        suscipit, earum modi accusamus voluptatem nostrum, praesentium
        numquam, reiciendis voluptas sit id quisquam. Consequatur in quis
        reprehenderit modi perspiciatis necessitatibus saepe, quidem, suscipit
        iure natus dignissimos ipsam, eligendi deleniti accusantium, rerum
        quibusdam fugit perferendis et optio recusandae sed ratione. Culpa,
        dolorum reprehenderit harum ab voluptas fuga, nisi eligendi natus
        maiores illum quas quos et aperiam aut doloremque optio maxime fugiat
        doloribus. Eum dolorum expedita quam, nesciunt
      </p>
      <p>
        Lorem ipsum cupiditate, corporis a qui libero ipsum delectus quidem
        dolor at nulla, adipisci veniam in reiciendis aut asperiores omnis
        blanditiis quod quas laborum nam! Fuga ad tempora in aspernatur
        pariatur fugit quibusdam dolores sunt esse magni, ut, dignissimos.
      </p>
      <p>Adipisicing elit. Tempore tempora rerum.</p>
    </section>

    <section data-scroll>
      <h1 class="title">Articles fading in</h1>
      <p>
        Consectetur adipisicing elit. Tempore tempora rerum, est autem
        cupiditate, corporis a qui libero ipsum delectus quidem dolor at
        nulla, adipisci veniam in reiciendis aut asperiores omnis blanditiis
        quod quas laborum nam! Fuga ad tempora in aspernatur pariaturlores
        sunt esse magni, ut, dignissimos.
      </p>
      <p>
        Lorem ipsum cupiditate, corporis a qui libero ipsum delectus quidem
        dolor at nulla, adipisci veniam in reiciendis aut asperiores omnis
        blanditiis quod quas laborum nam! Fuga ad tempora in aspernatur
        pariatur fugit quibusdam dolores sunt esse magni, ut, dignissimos.
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Tempore
        tempora rerum, est autem cupiditate, corporis a qui libero ipsum
        delectus quidem dolor at nulla, adipisci veniam in reiciendis aut
        asperiores omnis blanditiis quod quas laborum nam! Fuga ad tempora in
        aspernatur pariatur fugit quibusdam dolores sunt esse magni, ut,
        dignissimos.
      </p>
      <p>
        Lorem ipsum cupiditate, corporis a qui libero ipsum delectus quidem
        dolor at nulla, adipisci veniam in reiciendis aut asperiores omnis
        blanditiis quod quas laborum nam! Fuga ad tempora in aspernatur
        pariatur fugit quibusdam dolores.
      </p>
    </section>

    <section data-scroll>
      <h1 class="title">Character splitting</h1>
      <p>
        Consectetur adipisicing elit. Tempore tempora rerum, est autem
        cupiditate, corporis a qui libero ipsum delectus quidem dolor at
        nulla, adipisci veniam in reiciendis aut asperiores omnis blanditiis
        quod quas laborum nam! Fuga ad tempora in aspernatur pariaturlores
        sunt esse magni, ut, dignissimos.
      </p>
      <p>
        Lorem ipsum tempora in cupiditate, corporis a qui libero ipsum
        delectus quidem dolor at nulla, adipisci veniam in reiciendis aut
        asperiores omnis blanditiis quod quas laborum nam! Fuga ad tempora in
        aspernatur pariatur fugit quibusdam dolores sunt esse magni, ut,
        dignissimos. Adipisci veniam in reiciendis aut asperiores omnis
        blanditiis quod quas laborum nam! Fuga ad tempora in aspernatur
        pariaturlores sunt esse magni. Tempore tempora rerum, est autem
        cupiditate, corporis a qui libero.
      </p>
    </section>

    <section data-scroll>
      <h1 class="title">Colors changing</h1>
      <p>
        Consectetur adipisicing elit. Tempore tempora rerum, est autem
        cupiditate, corporis a qui libero ipsum delectus quidem dolor at
        nulla, adipisci veniam in reiciendis aut asperiores omnis blanditiis
        quod quas laborum nam! Fuga ad tempora in aspernatur pariaturlores
        sunt esse magni, ut, dignissimos.
      </p>
      <p>
        Lorem ipsum cupiditate, corporis a qui libero ipsum delectus quidem
        dolor at nulla, adipisci veniam in reiciendis aut asperiores omnis
        blanditiis quod quas laborum nam! Fuga ad tempora in aspernatur
        pariatur fugit quibusdam dolores sunt esse magni, ut, dignissimos.
      </p>
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Voluptates,
        deserunt facilis et iste corrupti omnis tenetur est. Iste ut est dicta
        dolor itaque adipisci, dolorum minima, veritatis earum provident error
        molestias. Ratione magni illo sint vel velit ut excepturi consectetur
        suscipit, earum modi accusamus voluptatem nostrum, praesentium
        numquam, reiciendis voluptas sit id quisquam. Consequatur in quis
        reprehenderit modi perspiciatis necessitatibus saepe, quidem, suscipit
        iure natus dignissimos ipsam, eligendi deleniti accusantium, rerum
        quibusdam fugit perferendis et optio recusandae sed ratione. Culpa,
        dolorum reprehenderit harum ab voluptas fuga, nisi eligendi natus
        maiores illum quas quos et aperiam aut doloremque optio maxime fugiat
        doloribus. Eum dolorum expedita quam, nesciunt
      </p>
      <p>Adipisicing elit. Tempore tempora rerum.</p>
    </section>

    <section data-scroll>
      <h1 class="title">The end</h1>
      <p>
        Consectetur adipisicing elit. Tempore tempora rerum, est autem
        cupiditate, corporis a qui libero ipsum delectus quidem dolor at
        nulla, adipisci veniam in reiciendis aut asperiores omnis blanditiis
        quod quas laborum nam! Fuga ad tempora in aspernatur pariaturlores
        sunt esse magni, ut, dignissimos.
      </p>
      <p>Adipisicing elit. Tempore tempora rerum.</p>
      <p>
        Lorem ipsum cupiditate, corporis a qui libero ipsum tempora in
        delectus quidem dolor at nulla, adipisci veniam in reiciendis aut
        asperiores omnis blanditiis quod quas laborum nam! Fuga ad tempora in
        aspernatur pariatur fugit quibusdam tempora in dolores sunt esse
        magni, ut, dignissimos.
      </p>
    </section>
  </div>
</body>
!

CSS 

              
                html,
body {
  margin: 0;
}

html {
  min-height: 100%;
  box-sizing: border-box;
  font-size: 10px;
}

body {
  height: 100%;
  width: 100%;
  background-image: linear-gradient(
    180deg,
    #5961f9 0%,
    #2afadf 40%,
    #f9fea5 100%
  );
  background-repeat: no-repeat;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

h1,
p {
  color: #204754;
  font-family: 'Nunito', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1 {
  margin-bottom: 1rem;
  font-size: 4rem;
}

p {
  font-size: 2rem;
  line-height: 2.8rem;
}

p:last-child {
  margin-bottom: -6px;
}
.site-wrap {
  max-width: 700px;
  margin: 0 auto;
  padding: 10rem 2rem;
}

section {
  margin-bottom: 10rem;
  padding: 4rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0px 0px 0 1px transparentize(#204754, 0.97),
    0px 0px 0 3px transparentize(#204754, 0.98);
}

section:last-child {
  margin-bottom: 0;
}

[data-scroll] {
  opacity: 0;
  will-change: transform, scale, opacity;
  transform: translateY(6rem) scale(0.93);
  transition: all 1.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

[data-scroll='in'] {
  opacity: 1;
  transform: translateY(0) scale(1);
}

[data-scroll='out'] {
  opacity: 0;
}
!

JS 

              
                ScrollOut({
  onShown: (element) => {
    new TypeIt(element.querySelector('.title'), {
      startDelay: 500,
      cursor: false,
    })
      .pause(2000)
      .go();
  },
});
!
999px

Console