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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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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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You can also link to another Pen here, and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML

            
              <main>
  <div class="buttons">
    <button onclick="addDot()">Add</button>
    <button onclick="removeDot()">Remove</button>
  </div>
  <ol id="list">
    <li>Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui.</li>
    <li>Donec sollicitudin molestie malesuada.</li>
    <li>Quisque velit nisi, pretium ut lacinia in, elementum id enim.</li>
    <li>Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus.</li>
    <li>Pellentesque in ipsum id orci porta dapibus.</li>
    <li>Donec sollicitudin molestie malesuada.</li>
  </ol>
</main>
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CSS

            
              li:nth-last-child(-n + 3) {
  color: red;
}

li:first-child {
  color: blue;
}

li:nth-last-child(-n + 3):first-child {
  font-weight: bold;
  color: black;
}
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JS

            
              function addDot() {
  var item = document.createElement("li");
  item.innerHTML = randomLorem();
  var dots = document.getElementById("list");
  
  dots.appendChild(item);
}

function removeDot() {
  var count = document.getElementById('list').children.length;
  var lastItem = document.getElementById('list').children[count - 1].remove();
}

function randomLorem() {
  var lorem = [ 
    'Pellentesque in ipsum id orci porta dapibus. Vivamus suscipit tortor eget felis porttitor volutpat.',
    'Cras ultricies ligula sed magna dictum porta. Pellentesque in ipsum id orci porta dapibus.',
    'Pellentesque in ipsum id orci porta dapibus. Vivamus suscipit tortor eget felis porttitor volutpat.',
    'Quisque velit nisi, pretium ut lacinia in, elementum id enim. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a.',
    'Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem.',
    'Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Quisque velit nisi, pretium ut lacinia in, elementum id enim.',
    'Proin eget tortor risus. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus.',
    'Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Cras ultricies ligula sed magna dictum porta.',
    'Cras ultricies ligula sed magna dictum porta. Sed porttitor lectus nibh.',
  ];
  return lorem[Math.floor(Math.random() * lorem.length)];
}
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