Why a dummy script block in html fixes css animations?

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So i inserted this line of code

<script>0</script> 

in my html as adviced in some udemy answers and it indeed fixed an animations problem i had where the text instead of just coming on the center of the page, would make a small "jump" at the start and it was annoying. The script block fixed it.

Couldnt find any thread related to this.

My html code:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <link
      href="https://fonts.googleapis.com/css?family=Lato:100,300,400,700,900"
      rel="stylesheet"
    />

    <link rel="stylesheet" href="css/icon-font.css" />
    <link rel="stylesheet" href="css/style.css" />
    <link rel="shortcut icon" type="image/png" href="img/favicon.png" />

    <title>Natours | Exciting tours for adventurous people</title>
  </head>
  <body>
    <!-- Should fix animations flickery  -->
    <script> 
      0;
    </script>

    <header class="header">
      <div class="header__logo-box">
        <img
          src="./img/imgDestiny/destiny-logo-white.png"
          alt="Logo"
          class="header__logo"
        />
      </div>
      <div class="header__text-box">
        <h1 class="heading-primary">
          <span class="heading-primary--main">Destiny</span>
          <span class="heading-primary--sub">is your only limit</span>
        </h1>

        <div class="text-box--btn">
          <a href="#" class="btn btn--white btn--animated">Discover your Fate</a>
        </div>
      </div>
    </header>
  </body>
</html>

Css:

/*
COLORS:

Light green: #7ed56f
Medium green: #55c57a
Dark green: #28b485

*/

/*
COLORS2:

Light green: #10bcf0
Medium green: #556ac5
Dark green: #284db4

*/

*,
*::after,
*::before {
  margin: 0;
  padding: 0;
  box-sizing: inherit; /* Take border-box of the body and inherit to the universally selected elements */
}

html {
  /* font-size: 10px; For people that need to increase the font size in order to read the page, pixels are not recommended */
  font-size: 62.5%; /* % of the default 16px to get 10px*/
}

body {
  font-family: 'Lato', sans-serif;
  font-weight: 400;
  /* font-size: 16px; browser default */
  line-height: 1.7;
  color: #777;
  padding: 3rem;

  box-sizing: border-box;
}

.header {
  height: 95vh;
  background-image: linear-gradient(
      to right bottom,
      rgba(15, 187, 240, 0.75),
      rgba(40, 77, 180, 0.75)
    ),
    url(../img/imgDestiny/destiny-background.jpg);
  background-size: cover;
  background-position: top;
  position: relative;

  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 75vh);
}

.header__logo-box {
  position: absolute;
  top: 4rem;
  left: 4rem;
}

.header__logo {
  height: 8rem;
}

.header__text-box {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.text-box--btn {
  text-align: center;
}

.heading-primary {
  color: #fff;
  text-transform: uppercase;

  backface-visibility: hidden; /* Fixes animations shaking */
  margin-bottom: 6rem;
}

.heading-primary--main {
  display: block;
  font-size: 6rem;
  font-weight: 400;
  letter-spacing: 6.1rem;

  animation-name: moveInLeft;
  animation-duration: 1s;
  animation-timing-function: ease-out;

  /*
  animation-delay: 3s; 
  animation-iteration-count: 3;
  */
}

.heading-primary--sub {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 2.5rem;

  animation: moveInRight 1s ease-out;
}

@keyframes moveInLeft {
  0% {
    opacity: 0;
    transform: translateX(-10rem);
  }

  80% {
    transform: translateX(1rem);
  }

  100% {
    opacity: 1;
    transform: translate(0);
  }
}

@keyframes moveInRight {
  0% {
    opacity: 0;
    transform: translateX(10rem);
  }

  80% {
    transform: translateX(-1rem);
  }

  100% {
    opacity: 1;
    transform: translate(0);
  }
}

@keyframes moveInBottom {
  0% {
    opacity: 0;
    transform: translateY(3rem);
  }

  100% {
    opacity: 1;
    transform: translate(0);
  }
}

.btn:link,
.btn:visited {
  text-transform: uppercase;
  text-decoration: none;
  padding: 1.5rem 4rem;
  display: inline-block;
  border-radius: 10rem;

  transition: all 0.2s;

  position: relative;
  font-size: 1.6rem;
}

.btn:hover {
  transform: translateY(-0.3rem);
  box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.2);
}

.btn:active {
  transform: translateY(-0.1rem);
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.2);
}

.btn--white {
  background-color: #fff;
  color: #777;
}

.btn::after {
  content: '';
  display: inline-block;
  height: 100%;
  width: 100%;
  border-radius: 10rem;
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;

  transition: all 0.4s;
}

.btn--white:after {
  background-color: #fff;
}

.btn:hover::after {
  transform: scaleX(1.4) scaleY(1.6);
  opacity: 0;
}

.btn--animated {
  animation: moveInBottom 0.5s ease-out 0.75s;
  animation-fill-mode: backwards;
}

What happens: https://streamable.com/0vikac See without the script tags the text "jumps" up a bit at the start of animations.

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