Transform your HTML before rendering.
Classes applied to the root html element.
Add meta tags, links, or scripts to the head section.
Write CSS with variables, nesting, and more.
Apply a CSS reset or normalization.
Automatically add browser vendor prefixes.
Include a popular CSS framework.
Any URLs added here will be added as <link>s in order, and loaded before your CSS.
Write modern JavaScript or other languages that compile to JS.
Any URLs added here will be added as <script>s in order, and run before the JavaScript in the editor.
Quick add:
If enabled, the preview updates as you type. If disabled, use the "Run" button.
How long to wait after typing before updating preview (in ms).
Capture console.log output in the built-in console.
Choose whether to use spaces or tabs for indentation.