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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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In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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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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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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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

            
              <div class="listing">
  <div class="box-title">
    <h1>This is a title</h1>

    <p>This is the introductory text for this section of the site.</p>

  </div>
  <div class="box-feature">
    <img class="box-image" src="http://placehold.it/900x450" alt="placeholder">

    <h2 class="box-feature-title">Featured Item</h2>
    <div class="box-content">
      <p>The first, therefore usually the latest but could be flagged as a feature, item is the feature. This item gets a big spot up next to the title of this section.</p>
      <p>It might have an image too. It's special like that.</p>
    </div>
  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer box-talk box-media">
    <img src="http://placehold.it/500x350" alt="placeholder" />
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>

</div>
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CSS

            
              .box-feature {
  grid-column: 4 / -1;
  grid-row: 1 / 2;
  display: grid;
  grid-gap: 20px;
  grid-template-columns: repeat(6, 1fr);
}

.box-feature .box-image {
  align-self: stretch;
  justify-self: stretch;
  grid-column: 1 / -1;
  grid-row: 1 / 4;
}

.box-feature .box-feature-title {
  grid-column: 3 / -1;
  grid-row: 1;
  background-color: rgba(0, 0, 0, 0.7);
  color: #fff;
  align-self: start;
  padding: 20px;
}

.box-feature .box-content {
  grid-column: 2 / -1;
  grid-row: 2;
  background-color: rgba(0, 0, 0, 0.7);
  color: #fff;
  padding: 20px;
}

.box-newer {
  padding: 20px;
  grid-column: auto / span 4;
}

.box-newer.box-media {
  grid-row-end: span 2;
  border: 1px dotted #7fdeff;
  background-color: transparent;
}

.box-newer.box-media,
.box-newer.box-media:nth-child(2n+1) {
  border: 1px dotted #7fdeff;
  background-color: transparent;
}

.box-newer:nth-child(2n+1) {
  background-color: #7fdeff;
}

.box-older {
  padding: 20px;
  font-size: 0.75rem;
  grid-column: auto / span 3;
}

.box-title {
  background-color: #694486;
  color: #fff;
  padding: 20px;
  align-self: start;
  grid-column: 1 / 4;
  grid-row: 1 / 2;
}

.listing {
  margin: 0 20px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-gap: 20px;
}
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