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Vendor Prefixing

Add External Stylesheets/Pens

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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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Editor Settings

Code Indentation

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                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nobis ipsa sapiente sint inventore <a href="" target="_blank"></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="" 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*=""])::after {
  content: '(external link)';
  display: inline-block;
  width: .7em;
  height: .7em;
  text-indent: .7em;
  white-space: nowrap;
  overflow: hidden;
  background-image: url(;
  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%; }