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How to use HTML Preview

Paste your HTML code, and the tool renders it live inside a sandboxed iframe so you can see exactly how it will look in a browser.

Frequently asked questions

How does the preview work?

Your HTML is rendered in an iframe with sandbox restrictions. It shows how the markup displays but blocks scripts and external resources for security.

Can I preview JavaScript and CSS?

Inline CSS works. JavaScript is blocked by the sandbox for security. For full preview with JS, use a dedicated code playground like CodePen.

Is the preview accurate?

The preview uses your browser's rendering engine, so it's accurate for HTML and CSS. Some features may be restricted by iframe sandbox security.

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