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About HTML Code Editor Online
This tool is a browser-based HTML editor with live preview. Type or paste HTML, CSS, and JavaScript in the editor panes, and the rendered result appears immediately in a sandboxed preview frame. Changes are reflected as you type.
Use it for quick prototyping, teaching front-end concepts, sharing minimal reproductions of a bug, testing CSS or JavaScript snippets without setting up a project, or showing markup snippets to others.
All editing happens in your browser; nothing is sent to a server. Your code persists in browser storage between visits, so you can return to a draft later without losing work.
How to use this tool
How to live-preview a snippet of HTML
Type or paste the HTML
Drop a fragment, a full document, or just a `<div>` into the "HTML" field. Inline `<style>` and inline `<script>` are kept verbatim — they execute in the preview as they would in a browser.
Press Run
Result returns a single `preview` field — the rendered output, either inline or as a sandboxed-iframe URL depending on platform. Use it to sanity-check styling, spacing, or whether a `<details>` element collapses as expected.
Sandboxing trade-offs
The preview runs your code; that's the point. Don't paste hostile JS you don't trust. If your snippet uses `localStorage`, `fetch`, or third-party CDN scripts, sandbox restrictions might block them — drop the snippet into a real local file when you need full network/storage access.
Persisting the result
Output is ephemeral; the tool isn't a CMS. Copy any working snippet back to a file in your project, commit it, and use this editor only for ad-hoc try-it-quickly experimentation.