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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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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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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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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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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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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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div class="page">
  <p><span class="caps">M</span>orem ipsum dolor sit amet, consectetur adipiscing elit. Morbi varius ipsum in eros suscipit posuere. Sed tellus mi, accumsan sit amet metus at, rutrum consequat massa. Maecenas ut vestibulum mi. Nam eleifend sit amet ipsum sed tristique. Suspendisse tempus purus quis urna facilisis, a consequat magna rutrum. Phasellus id tempus leo. Aenean vestibulum enim et dolor cursus, sed congue sapien dictum. Aliquam ultrices, massa ut mattis aliquet, nisi nunc porttitor elit, nec laoreet magna libero at arcu. Quisque ac aliquam enim, eget bibendum justo. Sed sit amet vestibulum ligula, sed consequat turpis.</p>

<p>Integer lobortis feugiat nisl at dictum. Cras luctus nunc pretium eros molestie, quis tempor quam elementum. Etiam dolor massa, cursus ac lacinia vitae, sollicitudin vestibulum orci. Vestibulum at cursus ligula. Nulla facilisi. Proin imperdiet, justo quis elementum congue, eros justo pretium lacus, eu consequat nunc erat id est. Quisque posuere a quam non sagittis. Fusce feugiat ut lacus mollis tincidunt. Proin fermentum laoreet lorem, a laoreet velit mattis in.</p>

<p>Proin bibendum, quam maximus iaculis rhoncus, elit mauris molestie lacus, ut eleifend ligula mi id turpis. Curabitur egestas diam non leo venenatis, sed sollicitudin quam feugiat. Nunc ullamcorper erat sed felis fermentum, quis efficitur neque pharetra. Morbi sollicitudin nunc at turpis porta sollicitudin. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Aliquam molestie arcu enim, ac vestibulum metus luctus et. Quisque facilisis, ex id mattis mattis, neque urna egestas ante, nec pharetra erat orci eget mauris. Mauris at fringilla orci. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Cras porta tincidunt massa efficitur dapibus. Nam et tortor ornare, vehicula magna non, interdum elit. Donec eget justo vel dui cursus tempor.</p>
<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Aliquam molestie arcu enim, ac vestibulum metus luctus et. Quisque facilisis, ex id mattis mattis, neque urna egestas ante, nec pharetra erat orci eget mauris. Mauris at fringilla orci. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Cras porta tincidunt massa efficitur dapibus. Nam et tortor ornare, vehicula magna non, interdum elit. Donec eget justo vel dui cursus tempor.</p></div>
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CSS 

              
                body {
  font-size: 14px;
  font-weight: 600;
}
.page {
  background-color: #f8f5de;
  background-image: linear-gradient(to right, rgba(255,210,0,0.4), rgba(200, 160, 0, 0.1) 11%, rgba(0,0,0,0) 35%, rgba(200, 160, 0, 0.1) 65%);
  box-shadow: inset 0 0 75px rgba(255,210,0,0.3), inset 0 0 20px rgba(255,210,0,0.4), inset 0 0 30px rgba(220,120,0,0.8);
  color: rgba(0,0,0,0.5);
  font-family: "AustralisProSwash-Italic";
  width: calc(8.5in - 15em);
  letter-spacing: 0.05em;
  line-height: 1.8;
  padding: 5em 10em 15em 5em;
}
.caps {
  color: rgba(0,0,0,0.7);
  float:left;
  font-size: 7em;
  line-height: 60px;
  padding-right: 12px;
  position:relative;
  top:8px;
}
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JS
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999px

Console