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HTML

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.

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).

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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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.

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

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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.

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.

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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.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

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.

Editor Settings

Code Indentation

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Visit your global Editor Settings.

HTML 

              
                <h1>Click the Run Button</h1>

<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Tempora aliquid voluptates atque velit labore? Ut velit, corrupti dolorum cumque suscipit omnis consequatur deleniti, aliquid possimus et officia, autem illo tempore!</p>
<p>Provident voluptatibus iusto mollitia fugit sapiente rem eos culpa aliquam officia sed impedit, odio et deserunt adipisci earum. Recusandae perspiciatis minus necessitatibus voluptate provident dolore. Exercitationem ea aspernatur doloremque veritatis?</p>
<p>Cupiditate enim et necessitatibus atque tempora ut ducimus magni rerum quisquam eius laudantium ipsam inventore fugit quibusdam nihil, unde nobis corrupti porro! Sequi, esse. Culpa eos voluptatem delectus aliquam hic.</p>
<p>Reprehenderit, sit recusandae aspernatur eius eos asperiores quaerat quos deleniti tempore temporibus assumenda dolore, et ipsam quisquam totam. Deleniti nulla debitis nihil sapiente adipisci autem laborum quisquam magni cum et.</p>
<p>Beatae obcaecati odit, dolore praesentium enim quia quasi tenetur molestiae a, fugit blanditiis deleniti libero. Laudantium, delectus. Quos dolorum repellat a ducimus aspernatur, earum laboriosam ratione, repellendus delectus ipsum velit!</p>
<p>Dignissimos ipsum exercitationem amet aut voluptates consequuntur praesentium eveniet iure aliquid culpa, maxime minus cumque. Similique doloremque consectetur pariatur quasi provident, reiciendis tempora ratione ipsam neque, magni voluptate aspernatur! Doloremque.</p>
<p>Inventore voluptates omnis voluptatem! Fuga quibusdam odit suscipit sequi reprehenderit ipsa quod, iste nesciunt, dolores consequuntur officiis voluptatem debitis? Perspiciatis eveniet sunt nisi ut distinctio vel cum aspernatur impedit eligendi?</p>
<p>Perspiciatis quos laboriosam molestiae explicabo quidem sit fugiat quaerat! Sint blanditiis sit pariatur voluptatibus culpa porro a, aliquid molestias ut. Consequatur perferendis quo sit cumque placeat vel cum laboriosam temporibus.</p>
<p>Iusto ratione inventore ipsam exercitationem maiores repudiandae tenetur similique, porro explicabo corrupti eligendi voluptatem corporis totam laborum iure est. Tenetur ratione ab corporis, sapiente dolorum iusto vitae. Aliquid, eligendi impedit!</p>
<p>Neque, perferendis unde eum dicta adipisci itaque, eligendi quam exercitationem voluptas corrupti laudantium totam alias modi doloribus porro quibusdam soluta facere vitae nihil autem possimus est repudiandae laborum? Laborum, esse.</p>
<p>Et dicta nulla, quas repellat aliquid consequatur modi accusantium, blanditiis illo dolores necessitatibus, quasi molestiae suscipit natus eveniet praesentium in assumenda vitae placeat enim quod! Accusantium, hic consequatur? Rerum, quo!</p>
<p>Quidem modi voluptatibus rerum tempore sed. Nesciunt iusto expedita ex illo nisi itaque obcaecati, quia ratione? Accusamus ad sed modi ut. Temporibus alias illo architecto repellendus. Repudiandae nemo molestias voluptatum.</p>
<p>Velit officiis numquam quia incidunt, alias harum porro ratione sapiente suscipit earum placeat rem, aspernatur vel natus vero perspiciatis nihil blanditiis, saepe laudantium fugiat animi quisquam. Amet sit cumque itaque.</p>
<p>Odio facere quam repellendus officia minima ad, dignissimos asperiores soluta! Laudantium maxime eius soluta dolorum exercitationem quibusdam? Reprehenderit vitae voluptate laboriosam. Excepturi placeat dolorem ipsum soluta laboriosam quaerat quia eveniet.</p>
<p>Accusantium quibusdam facere accusamus placeat perspiciatis ex! Magnam, perferendis commodi. Libero culpa adipisci mollitia molestiae vitae nam totam unde laudantium inventore perferendis recusandae impedit, velit possimus vel consequuntur ex distinctio.</p>
<p>Fuga officiis porro quae quos ex delectus incidunt qui voluptate hic explicabo, cumque dolorem quidem sequi asperiores magni laborum aliquid? Id alias at hic fugiat optio consectetur ducimus delectus consequuntur?</p>
<p>Esse fugiat laudantium, in laboriosam, quaerat illo dicta ex expedita quidem aliquid alias nisi error voluptatem rem nihil libero aperiam quam itaque sed inventore veniam quibusdam facere. Corrupti, enim asperiores?</p>
<p>Quaerat veniam molestias assumenda dolore quisquam dolor quod, nesciunt animi fugit accusamus asperiores laboriosam culpa? Consequatur omnis non nihil quidem quisquam fugiat expedita quas praesentium inventore. Dolore ratione a tenetur?</p>
<p>Rerum reiciendis, distinctio aperiam neque culpa praesentium voluptatum deleniti enim, a itaque consequatur pariatur mollitia quae iste officiis numquam! Minus commodi eveniet obcaecati in maiores eaque consequuntur. Voluptatum, minus itaque.</p>
<p>Impedit ipsam temporibus nemo, ab in assumenda vero necessitatibus illo. Dignissimos maxime asperiores dolorum modi iure sunt nam nulla optio, nostrum at possimus qui ad corrupti fugit adipisci porro voluptatum.</p>
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CSS
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JS 

              
                $('html, body').animate({
    scrollTop: $(document).height() - $(window).height()
  }, 
  {
    duration: 1500,
    specialEasing: {
      scrollTop: "easeOutCubic"
    }
  }
);
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999px

Console