Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

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.

+ add another resource

JavaScript

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.

+ add another resource

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.

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

              
                <div class="container">
  <p>
    <em><small>Click on the anchor links (underlined) and on the paragraph below it to see the styles applied to them when they're active. Try holding the mouse click for a little longer to see the styles better if needed. </small></em>
  </p>
  <br>
  <p>Lorem ipsum dolor sit <a href="#">amet</a>, consectetur adipisicing elit. <a href="#">Atque</a>, non rerum quae eaque porro fugit deleniti nemo in modi iste recusandae quo earum veritatis et eveniet voluptas magnam <a href="#">dolorum delectus</a>!</p>
  <br>
  <div class="text">
    My background color changes when you click on me.
  </div>
</div>
              
            
!

CSS

              
                body {
  color: #555;
  font-size: 1.1em;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
  margin: 40px auto;
  max-width: 700px;
}

.text {
  padding: 20px;
  background-color: #eee;
}

.text:active {
  background-color: #a10000;
  color: white;
}

a {
  color: #a10000;
}

a:active {
  background-color: #a10000;
  color: white;
}
              
            
!

JS

              
                
              
            
!
999px

Console