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About HTML Preprocessors

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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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).

     

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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About External Resources

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.

If the stylesheet 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 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.

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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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.

Learn more

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Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

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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

            
              <div class="container">
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean dictum arcu sed erat fringilla placerat. Proin fringilla lacinia risus sed porttitor. Quisque tincidunt lectus vitae massa vulputate pellentesque et vitae ligula. Sed eu leo odio. Aliquam erat volutpat. Praesent cursus quam purus, sed scelerisque orci tincidunt in. Donec a neque facilisis, lobortis tellus vitae, dictum nisl. Morbi sed lacus dui. Sed eu leo imperdiet, pulvinar massa ut, ullamcorper magna.

Cras tempus, sapien eu rutrum dictum, nisi neque congue sapien, eu aliquet neque felis molestie urna. Suspendisse ut egestas purus, id commodo dolor. Praesent vel magna ut augue tristique iaculis. Aenean a turpis dui. Pellentesque at ullamcorper magna. Aenean accumsan enim quis est ultricies tristique. Donec hendrerit lorem luctus sollicitudin sodales. Proin lacinia magna a venenatis blandit. Vestibulum ac odio ac tortor laoreet tempus. Maecenas eget suscipit est, eget condimentum lectus. Nam convallis maximus mauris mattis bibendum. Pellentesque at velit vestibulum, egestas lectus iaculis, molestie lorem. Morbi aliquet enim velit, ut vulputate lacus suscipit a.

Quisque efficitur nisl vitae libero euismod, at imperdiet mi gravida. Quisque dui nisi, accumsan in finibus at, gravida a eros. In sit amet libero vitae lectus molestie sollicitudin non sed lectus. Nulla volutpat, elit et lacinia venenatis, lacus leo maximus ex, a pharetra orci enim fermentum ex. Curabitur sit amet pulvinar dolor. In ac justo sollicitudin, pulvinar leo vitae, ullamcorper massa. Pellentesque feugiat accumsan scelerisque. Nunc nec ex non massa hendrerit consectetur ac et dolor. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.

Suspendisse quis gravida erat, sed ullamcorper purus. Maecenas consequat faucibus nisl, ac tempor lacus. Maecenas ullamcorper pharetra rhoncus. Sed nec auctor ligula. Nunc commodo augue ligula, non interdum lectus laoreet ac. Proin fermentum imperdiet interdum. Pellentesque id dapibus enim, ullamcorper lacinia purus. Praesent imperdiet vestibulum enim sed vulputate. Donec pulvinar leo sed mauris lobortis mattis.

Curabitur faucibus sit amet diam id posuere. Nunc mollis nunc vel est pharetra facilisis. Suspendisse neque augue, sodales non suscipit nec, egestas sed erat. Ut eu mattis turpis. Aenean porta dui vitae velit suscipit eleifend. Integer ac arcu quis nulla faucibus rutrum id quis lacus. Donec tempus nisi et tortor cursus accumsan. Aliquam molestie eget libero a laoreet. Integer in condimentum urna. Nam eu egestas eros. Praesent posuere, ipsum eget suscipit efficitur, mi felis aliquet eros, in aliquet nibh enim mattis massa.
</div>
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CSS

            
              .container {
  height: 400px;
  width: 400px;
  border: 1px  solid #eee;
  padding: 5px;
  overflow-y: auto;
}
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JS

            
              new SimpleBar(document.querySelector('div'));
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999px
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