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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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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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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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.



<div class="tabs">
	<nav class="tab-list">
		<a class="tab active" href="#tab-1">Tab 1</a>
		<a class="tab" href="#tab-2">Tab 2</a>
		<a class="tab" href="#tab-3">Tab 3</a>

	<div id="tab-1" class="tab-content show">Pellentesque aptent rhoncus feugiat ullamcorper suscipit ante cras bibendum massa suspendisse nascetur nulla sociosqu, curabitur eros magna morbi hac ultrices natoque varius condimentum tristique tortor porta.</div>

	<div id="tab-2" class="tab-content">Lorem ipsum dolor sit amet consectetur adipiscing elit condimentum, litora pellentesque lobortis mus suscipit integer.</div>

	<div id="tab-3" class="tab-content">Sapien hac fermentum erat congue sodales egestas suspendisse lobortis, non tristique quam penatibus vehicula mus ultricies.</div>


                .active {
	font-weight: 600;

.tab-content {
	display: none;

.show {
	display: block;


                $(".tab-list").on("click", ".tab", function(event) {