Write HTML, CSS and JavaScript in three editors and see the result in a live sandboxed preview that updates as you type.
The playground gives you three side-by-side editors for HTML, CSS and JavaScript and a live preview underneath. Every change rebuilds a small page from the three panels and loads it in a sandboxed frame, so you can see layout, styling and script behavior right away without saving files or running a server.
It is handy for testing a CSS rule, checking how a snippet of markup renders, trying out a small script, or building a quick demo to explain an idea. The preview frame allows scripts but is isolated from the rest of the page. A starter card with a styled button and a click handler is loaded so you can see how the three panels connect.
You can add a script or link tag in the HTML panel that points to a hosted file, as long as your network allows it. The preview loads it like a normal page.
No. The code lives only in the page while it is open, so copy anything you want to keep before leaving.