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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

About CSS Preprocessors

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

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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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 

              
                <h1 class="header-section">Scroll down to some different pinned content shown</h1>

<div class="container" style="margin-bottom: 100px;">
  <div class="col bg-grey" style="height: 300px; padding: 100px;">
    <h2>Here's some static content</h2>
  </div>
  <div class="col">
    <img src="https://via.placeholder.com/600x500?text=Static+Image" alt="Static Image One" width="600" height="500" />
  </div>
</div>

<div class="content-container">
  <div class="col left-content">
    <img id="img1" class="imageToShow" src="https://via.placeholder.com/600x720?text=Image+Number+One" alt="Image Number One" width="600" height="720" />
    <img id="img2" class="imageToShow" src="https://via.placeholder.com/600x720?text=Image+Number+Two" alt="Image Number Two" width="600" height="720" />
    <img id="img3" class="imageToShow" src="https://via.placeholder.com/600x720?text=Image+Number+Three" alt="Image Number Three" width="600" height="720" />
    <img id="img4" class="imageToShow" src="https://via.placeholder.com/600x720?text=Image+Number+Four" alt="Image Number Four" width="600" height="720" />
    <img id="img5" class="imageToShow" src="https://via.placeholder.com/600x720?text=Image+Number+Five" alt="Image Number Five" width="600" height="720" />
  </div>
  <div class="col right-content">
    <div class="contentMarker" data-marker-content="img1">
      <h2 class="text-light">Text Number One</h2>
      <p class="text-light">Lorem ipsum dolor sit amet consectetur adipiscing elit.</p>
    </div>
    <div class="contentMarker" data-marker-content="img2">
      <h2 class="text-light">Text Number Two</h2>
      <p class="text-light">Quis varius quam quisque id diam vel quam elementum.</p>
    </div>
    <div class="contentMarker" data-marker-content="img3">
      <h2 class="text-light">Text Number Three</h2>
      <p class="text-light">Porta nibh venenatis cras sed felis eget velit.</p>
    </div>
    <div class="contentMarker" data-marker-content="img4">
      <h2 class="text-light">Text Number Four</h2>
      <p class="text-light">Sed felis eget velit aliquet sagittis id.</p>
    </div>
    <div class="contentMarker" data-marker-content="img5">
      <h2 class="text-light">Text Number Five</h2>
      <p class="text-light">Tristique senectus et netus et malesuada.</p>
    </div>
  </div>
</div>

<div class="container" style="margin-top: 100px;">
  <div class="col bg-grey" style="height: 150px; padding: 100px;">
    <h2>Here's some more static content</h2>
  </div>
  <div class="col">
    <img src="https://via.placeholder.com/600x350?text=Static+Image" alt="Static Image Two" width="600" height="350" />
  </div>
</div>
!

CSS 

              
                body {
  margin: 0;
  font-family: sans-serif;
}

.header-section {
  text-align: center;
  margin: 40vh auto 50vh;
}

.container, .content-container {
  max-width: 1200px;
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  display: flex;
  > .col {
    width: 50%;
  }
}

.left-content {
  //height: 100vh;
  height: 720px;
  position: relative;
  > * {
    position: absolute;
    left: 50%;
    top: 50%;
    opacity: 0;
    visibility: hidden;
  }
}

.right-content > * {
  background-color: #eeeeee;
  padding: 100px;
  height: 520px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.bg-grey {
  background-color: #c4c4c4;
}

.contentMarker {
  border: 1px solid gray;
}
!

JS 

              
                console.clear();

gsap.defaults({overwrite: 'auto'});

gsap.set(".left-content > *", {xPercent: -50, yPercent: -50});

// Set up our scroll trigger
const ST = ScrollTrigger.create({
    trigger: ".content-container",
    start: "top top",
    end: "bottom bottom",
    onUpdate: getCurrentSection,
    pin: ".left-content"
});

const contentMarkers = gsap.utils.toArray(".contentMarker");

// Set up our content behaviors
contentMarkers.forEach(marker => {
    marker.content = document.querySelector(`#${marker.dataset.markerContent}`);

    if(marker.content.tagName === "IMG") {
        gsap.set(marker.content, {transformOrigin: "center"});

        marker.content.enter = function() {
            gsap.fromTo(marker.content, {autoAlpha: 0}, {duration: 0.3, autoAlpha: 1});
        }
    }

    marker.content.leave = function() {
        gsap.to(marker.content, {duration: 0.1, autoAlpha: 0});
    }

});

// Handle the updated position
let lastContent;
function getCurrentSection() {
    let newContent;
    const currScroll = scrollY;

    // Find the current section
    contentMarkers.forEach(marker => {
        if(currScroll > marker.offsetTop) {
            newContent = marker.content;
        }
    });

    // If the current section is different than that last, animate in
    if(newContent
        && (lastContent == null
            || !newContent.isSameNode(lastContent))) {
        // Fade out last section
        if(lastContent) {
            lastContent.leave();
        }

        // Animate in new section
        newContent.enter();

        lastContent = newContent;
    }

}

const media = window.matchMedia("screen and (max-width: 600px)");
ScrollTrigger.addEventListener("refreshInit", checkSTState);
checkSTState();

function checkSTState() {
    if(media.matches) {
        ST.disable();
    } else {
        ST.enable();
    }
}
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999px

Console