<!doctype html>
<html lang="ru">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <title>Hello, world!</title>
  </head>
  <body>
    <header>
    </header>
    <section class="container">
      <article>
        <div class="row py-3">
          <div class="col">
            <h1>Заголовок текста</h1>
          </div>
        </div>
      </article>
    </section>
    <footer>
    </footer>
    <link href="/css/bootstrap.min.css" rel="stylesheet">
    <link href="/css/style-custom.css" rel="stylesheet">
    <script src="/js/pagejs.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
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    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG+2QOK9T+ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
  </body>
</html>
span {
  opacity: 0;
  animation: anime 1s ease forwards;
}

@keyframes anime {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
let h1Text = document.querySelector('h1').textContent;
let i = document.querySelector('h1');
let simvols = h1Text.split(' ');
document.querySelector('h1').innerHTML = "";
for(let s = 0; s < simvols.length; s++){
    setTimeout (() => {
        document.querySelector('h1').insertAdjacentHTML("beforeEnd",'<span>' + simvols[s] +'</span> ');
    }, 1000 * (s + 1));
  
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.