$ preview --html

html live preview.

Write HTML, CSS, and JavaScript and see the rendered output in real-time. 100% client-side.

HTML

CSS

JavaScript

preview

How does HTML preview work?

The HTML preview tool renders your code in a sandboxed iframe inside your browser. You type HTML, CSS, and JavaScript on the left, and the result updates live on the right.

Is my code sent to a server?

No, everything runs locally in your browser. The preview uses a sandboxed iframe, meaning your code never leaves your computer.

Can I use JavaScript in the preview?

Yes, JavaScript code inside <script> tags executes in the preview iframe. This is useful for prototyping interactive components and testing logic.

learn more in our detailed guide.

→ read the guide