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HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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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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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ 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.

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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

Auto Save

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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.

HTML 

              
                <h2 class="editable">Editable header</h2>

<div class="editable">
  <p>
    This is an editable div element.
  </p>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam tincidunt est ac dolor condimentum vitae laoreet ante accumsan. Nullam tincidunt tincidunt ante tempus commodo. Duis rutrum, magna non lacinia tincidunt, risus lacus tempus ipsum, sit amet euismod justo metus ut metus. Donec feugiat urna non leo laoreet in tincidunt lectus gravida. Sed semper ante sed dui consectetur eget commodo eros imperdiet. Mauris magna diam, scelerisque at ornare vel, dignissim ac sem. Fusce id congue lacus. Duis sit amet tellus erat. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Phasellus mattis facilisis pretium. In in nibh eu urna ornare semper. Sed imperdiet felis vitae nibh sagittis eu pulvinar metus facilisis. Sed dolor orci, aliquet sagittis auctor id, faucibus at justo.
  </p>
  <p>
    Vestibulum vestibulum velit nec magna lobortis elementum. Ut egestas ultrices tincidunt. Sed vestibulum mi vitae dui interdum eget rhoncus neque faucibus. Ut nec leo tellus. Nunc in metus sit amet purus bibendum dignissim pulvinar quis erat. Quisque vel ultricies nisi. Vestibulum eu ante risus. In ultrices dignissim massa, vel luctus dui consequat quis. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.
  </p>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis dui nulla, venenatis at porttitor nec, sagittis et urna. Nulla facilisi. Integer bibendum porta urna porta suscipit. In condimentum quam quis justo accumsan molestie. Fusce accumsan vulputate mattis. Sed pharetra volutpat erat at convallis. Etiam tempus, est ac tincidunt scelerisque, mi elit pretium nulla, sit amet viverra nisl enim id lorem. Suspendisse ut enim ullamcorper tellus eleifend sagittis. Aenean mollis turpis eu nisl viverra laoreet. Mauris ante purus, tempor ut viverra eu, vestibulum eget tellus. Morbi vitae dolor tellus. Mauris sodales rutrum nunc, a imperdiet augue egestas vel. Nulla facilisi. Nulla venenatis tristique nisi ut blandit. Phasellus suscipit arcu adipiscing velit posuere nec lacinia urna mattis.
  </p>
  <p>
    Nulla ullamcorper magna sit amet leo porta blandit. Aliquam sed nulla ac arcu vehicula feugiat. Fusce eget accumsan dui. Vestibulum vel leo tellus. Sed dignissim justo in nunc interdum tempor vehicula neque egestas. Fusce lacinia turpis sit amet leo consequat laoreet. Cras nec erat ac purus volutpat consequat. Vestibulum iaculis tincidunt purus eget blandit. Cras consectetur tellus libero. Vestibulum eros orci, volutpat vitae lobortis sit amet, porta quis felis. In a lacus ac neque luctus mollis. Nulla elementum nunc ac ante porttitor id venenatis augue venenatis. In aliquam magna non dolor convallis consequat.
  </p>
</div>
!

CSS 

              
                body {
  background: transparent;  
}

.content {
  overflow: visible;
  position: relative;
  width: auto;
  margin-left: 0;
  min-height: auto;
  padding: inherit;
}
!

JS 

              
                tinymce.init({
  selector: 'h2.editable',
  inline: true,
  toolbar: 'undo redo',
  menubar: false
});

tinymce.init({
  selector: 'div.editable',
  inline: true,
  plugins: [
    'advlist autolink lists link image charmap print preview anchor',
    'searchreplace visualblocks code fullscreen',
    'insertdatetime media table contextmenu paste'
  ],
  toolbar: 'insertfile undo redo | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image'
});
!
999px

Console