Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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Behavior

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If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

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Code Indentation

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HTML

              
                <p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>

<p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Eaque illo molestias odit quidem facere culpa alias quasi fuga! Consequatur minima delectus illo error porro magniLorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Et, deleniti ratione atque consectetur suscipit tempora earum enim accusantium reiciendis tempore architecto obcaecati sint cumque modi!Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Temporibus, quis quidem nam modi in non quisquam quia! Distinctio maxime sint esse quaerat magni earum sequi!Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Illo veritatis, saepe iste autem eligendi id cum cupiditate recusandae rerum eius! Porro aperiam fugit quaerat aspernatur?Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>
<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>

<p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Eaque illo molestias odit quidem facere culpa alias quasi fuga! Consequatur minima delectus illo error porro magniLorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Et, deleniti ratione atque consectetur suscipit tempora earum enim accusantium reiciendis tempore architecto obcaecati sint cumque modi!Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Temporibus, quis quidem nam modi in non quisquam quia! Distinctio maxime sint esse quaerat magni earum sequi!Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Illo veritatis, saepe iste autem eligendi id cum cupiditate recusandae rerum eius! Porro aperiam fugit quaerat aspernatur?Lorem ipsum dolor, sit amet consectetur adipisicing elit. Ipsam, beatae pariatur nobis hic quae quas porro iusto vitae velit amet enim eveniet illum corrupti autem!</p>

              
            
!

CSS

              
                p {
  font-family: sans-serif;
  font-size: 18px;
  line-height: 1.6rem;
  max-width: 600px;
  margin: 20px auto;
  opacity: .3;
  transform: scale(.75);
  transition: 0.6s all;
  
  &.visible {
    opacity: 1;
    transform: none;
  }
}

              
            
!

JS

              
                window.addEventListener("load", createObserver(), false);

function createObserver() {
  
  const options = {
    root: null,
    rootMargin: "0px",
    threshold: [0]
  };
  // instantiate a new Intersection Observer
  let observer = new IntersectionObserver(onChange, options);
  
  // pass each element to observe method
  let elements = document.querySelectorAll('p');  
  for (let elm of elements) {
    observer.observe(elm);
  }

}
// When the browser detects that the target element visibility ratio crosses one of the thresholds in our list it calls our handler function
function onChange(entries) {
  entries.forEach((entry) => {
    if(entry.isIntersecting && entry.intersectionRatio !== 0) {
      entry.target.classList.add('visible');
    } else {
      entry.target.classList.remove('visible');
    }
  });
}


              
            
!
999px

Console