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Pen Settings

CSS Base

Vendor Prefixing

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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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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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.

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Code Indentation


Save Automatically?

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.

              <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nobis ipsa sapiente sint inventore <a href="http://www.heydonworks.com" target="_blank">heydonworks.com</a> delectus beatae quos, hic atque deleniti similique nemo illo ipsum molestiae, alias, perferendis eaque animi consectetur omnis.</p>


  <strong>Note:</strong> This is Heydon’s demo (<a href="https://codepen.io/heydon/pen/pgBBdR?editors=0100" target="_blank">link</a>). I’ve just lowered the icon to the baseline, so that it doesn’t increase the line box’s height in a paragraph context.

              /* the selector matches and external link (ie. starting with http), 
not including links to the current domain */
[href^="http"]:not([href*="codepen.io"])::after {
  content: '(external link)';
  display: inline-block;
  width: .7em;
  height: .7em;
  text-indent: .7em;
  white-space: nowrap;
  overflow: hidden;
  background-image: url(https://upload.wikimedia.org/wikipedia/commons/4/44/Icon_External_Link.svg);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 100%;
  margin-left: .1em;

/* other styles */
p { max-width: 30em; }
p:first-of-type { font-size: 200%; }
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