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HTML Formatter
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HTML Playground

HTML Playground is a live editor for HTML, CSS, and JavaScript with instant preview.

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About HTML Playground

HTML Playground is a live editor for HTML, CSS, and JavaScript with instant preview.

Prototype UI components, test snippets, and debug layout issues without setting up a local server. Changes render immediately in the preview pane.

How to use HTML Playground

  1. Write HTML in the HTML tab, styles in CSS, and behavior in JS.
  2. The preview updates as you type.
  3. Resize the preview to test responsive layouts.
  4. Copy the combined snippet when you are happy with the result.
  5. Reset panels to start a fresh example.

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Frequently asked questions

Is the preview sandboxed?
Yes. Preview runs in an isolated iframe for safer script execution.
Can I use external libraries?
You can link CDN scripts in the HTML panel. Network access depends on the CDN.
Is my code saved?
Code stays in your browser session unless you copy it elsewhere. Nothing is stored on our servers.
Does it support modern CSS?
Yes. The preview uses your browser engine, so modern CSS features are supported.