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HTML

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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

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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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HTML 

              
                <div class="progress-bar"></div>
<header>
  <span class="hamburger">🍔</span>
  <div class="logo"></div>
</header>
<main id="main" class="container">
  <h1 id="main-title">Lorem ipsum dolor sit amet</h1>
  <a href="https://unsplash.com/photos/ljb3u4eC3bM"><img id="featured-image" src="https://images.unsplash.com/photo-1594405739404-bc878da14da9?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=2371&q=80" width="1245" height="830"></a>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque accumsan euismod mauris, eget ornare erat luctus at. Etiam quis enim sed orci eleifend condimentum. Quisque pulvinar libero ante, non faucibus neque suscipit non. Duis sodales nisi a lacus sagittis tincidunt. Praesent a risus malesuada ligula condimentum dictum vel sit amet leo. Vestibulum maximus nibh nec cursus iaculis. Fusce vulputate magna vitae nisi ornare blandit. Sed sagittis sagittis fringilla. Suspendisse cursus lorem metus, eget venenatis felis porttitor a. Praesent ultricies lectus a odio rutrum, ut convallis velit porta.</p>
  <p>Sed euismod lectus at dolor auctor efficitur. Aenean dignissim, elit sed facilisis lacinia, velit sem tincidunt mi, ultricies mattis nibh sapien sit amet arcu. <a href="http://store.daniellemlbastien.com">Maecenas a dui ex.</a> Proin at neque accumsan, convallis felis sit amet, elementum leo. Sed nisi tellus, blandit in hendrerit eu, rhoncus vitae nunc. Proin viverra egestas quam sed interdum.</p>

  <a href="https://unsplash.com/photos/n_uraBThPlM"><img id="img1" loading="lazy" src="https://images.unsplash.com/photo-1652184887839-7498099d5bad?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=987&q=80" alt="" width="651" height="976" /></a>

  <p>Morbi blandit, <a href="#">magna</a> non fermentum congue, arcu nibh egestas velit, tempor elementum justo odio a ipsum. Integer dictum odio eu dapibus condimentum. Proin pharetra lectus a purus sollicitudin hendrerit. Aliquam erat volutpat. Morbi cursus euismod posuere. Phasellus non porta velit. Donec imperdiet malesuada malesuada.</p>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque accumsan euismod mauris, eget ornare erat luctus at. Etiam quis enim sed orci eleifend condimentum. Quisque pulvinar libero ante, non faucibus neque suscipit non. Duis sodales nisi a lacus sagittis tincidunt.</p>
  <p> Praesent a risus malesuada ligula condimentum dictum vel sit amet leo. Vestibulum maximus nibh nec cursus iaculis. Fusce vulputate magna vitae nisi ornare blandit. Sed sagittis sagittis fringilla. Suspendisse cursus lorem metus, eget venenatis felis porttitor a. Praesent ultricies lectus a odio rutrum, ut convallis velit porta.</p>
  <a href="https://unsplash.com/photos/ArOQBbxztv8"><img id="img2" loading="lazy" src="https://images.unsplash.com/photo-1645905306015-422c0ec6af26?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=987&q=80" alt="" width="651" height="976" /></a>

  <p>Quisque accumsan euismod mauris, eget ornare erat luctus at. Etiam quis enim sed orci eleifend condimentum. Fusce vulputate magna vitae nisi ornare blandit. Sed sagittis sagittis fringilla.</p>
</main>
!

CSS 

              
                $white: rgb(247, 247, 247);
$blue: rgb(0, 129, 157);
$purple: rgb(157, 81, 220);
$green: rgb(91, 130, 0);

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

html {
  font-size: 16pt;
}

body {
  overflow-x: hidden;
  font-size: 1rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
    sans-serif;
  line-height: 1.5;
}

.container {
  max-width: min(75ch, 50vw);
  margin: 1rem auto;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}
h1 {
  margin-bottom: 0.75rem;
}
p,
img {
  margin-bottom: 1.5rem;
}

a {
  color: $blue;
  &:visited {
    color: $purple;
  }
  &:hover,
  &:active {
    color: $green;
  }
}
header {
  background-color: white;
  border-bottom: 2px solid black;
  padding: .5rem;
  position: sticky;
  top: .5rem;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;

  .logo {
    justify-self: center;
    border-radius: 100%;
    background-color: green;
    height: 48px;
    width: 48px;
  }
}

/// ----------------------

@scroll-timeline bodyProgress {
  time-range: 1s;
}

@scroll-timeline mainProgress {
  time-range: 1s;
   start: selector(#main-title) start 1;
  end: selector(#featured-image) start 0;
}


@scroll-timeline img1Progress {
  time-range: 1s;
  start: selector(#img1) end .5;
  end: selector(#img1) end 1.5;
}

@scroll-timeline img2Progress {
  time-range: 1s;
  start: selector(#img2) end 0.25;
  end: selector(#img2) end 1.25;
}

@keyframes scrollProgress {
  to { transform: translateX(0); }
}

@keyframes circleReveal {
  to {
    clip-path: circle(125%);
  }
}

@keyframes wipeDown {
  to {
    clip-path: inset(0 0 0 0);
  }
}

@keyframes slideUp {
  to {
    transform: translateY(-100%);
  }
}


.progress-bar {
  position: sticky;
  z-index: 15;
  top: 0;
  height: .5rem;
  transform: translateX(100%);
  animation: scrollProgress 1s linear both;
  animation-timeline: bodyProgress;
  background-color: green;
}


#img1 {
  clip-path: circle(0%);
  animation: circleReveal 1s linear both;
  animation-timeline: img1Progress;
}


#img2 {
  clip-path: inset(0 0 100% 0);
  animation: wipeDown 1s linear both;
  animation-timeline: img2Progress;
}

header {
  transform: translateY(0);
  animation: slideUp 1s linear both;
  animation-timeline: mainProgress;
}

@supports not (animation-timeline: mainProgess){
  body {
    position: relative;
    ::after {
      content: "Your browser does not yet support animation-timeline";
      position: absolute;
      background: white;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
    }
  }
  
   * {
      animation: none;
      transform: none;
    }
}
!

JS 

              
                // https://www.youtube.com/watch?v=mzKfetD9YrA
!
999px

Console