HTML Playground
UI ToolsWrite HTML, CSS, and JavaScript in a live browser editor and see the result instantly. No setup required — prototype, experiment, and share your HTML snippets in seconds.
HTML / CSS / JShtml
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About HTML Playground
The HTML Playground gives you a single-pane editor for HTML, CSS, and JavaScript with a live preview iframe that updates as you type. Prototype UI ideas, test browser APIs, or create self-contained demos — all without leaving your browser.
Features
- ✓Single editor pane accepts HTML, inline CSS, and inline JavaScript
- ✓Live preview iframe updates as you type (Auto-run mode)
- ✓Manual Run button for testing larger snippets
- ✓Reset button restores the starter template
- ✓Supports any CDN-hosted library via <script> or <link> tags
- ✓Sandboxed iframe keeps the host page safe
Common Use Cases
- Quickly prototype a UI layout or component
- Test browser APIs like localStorage, canvas, or fetch
- Create a minimal reproduction of a front-end bug
- Demonstrate an HTML/CSS technique to a colleague
- Build a self-contained demo to share in a forum or code review
Frequently Asked Questions
QCan I use external libraries like Bootstrap or jQuery?
Yes — add a <script> or <link> tag pointing to a CDN URL directly in the HTML editor and it will load in the preview iframe.
QDoes alert() work in the preview?
Yes. The preview iframe allows modal dialogs (alert, confirm, prompt) so browser-native popups will appear as expected.
QIs my code saved?
Code lives in your browser session. Bookmark the page or copy your code to save it — nothing is stored on the server.