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.

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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

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Auto-Updating Preview

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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

              
                <button>Expand</button>
<div>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis sed ligula eu neque bibendum hendrerit. Donec et mi vel nibh elementum molestie. Proin ultrices tortor tortor, non dignissim nulla. Nullam tempus massa purus, sed dignissim enim. Pellentesque vitae justo neque. Aliquam dictum rutrum purus quis aliquet. Curabitur quis nisl sed elit bibendum egestas. Phasellus magna libero, ultrices sit amet scelerisque a, eleifend vel est. Sed scelerisque dui nec metus condimentum bibendum. Phasellus lacinia urna sit amet lacus pretium sit amet dictum nibh blandit. Praesent aliquet hendrerit fringilla. Nunc vitae pellentesque lectus. Nullam mollis mattis tempus.</div>
              
            
!

CSS

              
                div {
  padding:10px;
  border:1px solid #000;
  margin:30px;
  width:500px;
}
              
            
!

JS

              
                $("button").click(function () {
  $("div").toggle("slow");
});
              
            
!
999px

Console