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HTML CSS JS Playground

Write, run, and share code snippets — no setup required.

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Build HTML, CSS, and JavaScript with a live preview

This is a free online HTML, CSS, and JavaScript playground with a real browser preview. Edit three files — index.html, styles.css, and script.js — and watch the iframe re-render on every change. No local server, no Live Server extension, no build step.

Under the hood, the editor is powered by the same engine as VS Code (HTML tags, CSS properties, and JS autocompletion), and the live preview renders your page inside a sandboxed iframe in your browser. Whether you're sketching a landing page, experimenting with CSS grid, or writing vanilla DOM scripts, this web playground goes from markup to preview instantly.

What makes this HTML, CSS, and JavaScript playground useful

  • Instant live preview — edit HTML, CSS, or JS and watch the iframe re-render on every change. No build step, no refresh.
  • HTML, CSS, and JavaScript syntax highlighting and autocompletion — Emmet-style shortcuts and instant feedback, all in the same editor engine as VS Code.
  • Zero install — no Node, no Live Server, no local HTTP server. Preview HTML, CSS, and JS from any browser.
  • Live preview with all three files — HTML, CSS, and JavaScript edit together and re-render in an iframe on every change, no build step.

What you can build in the HTML, CSS, and JavaScript playground

  • A landing page: structured HTML, modern CSS (grid, flex, custom properties), and a sprinkle of JavaScript — all live-reloaded in the preview iframe.
  • CSS experiments — grid layouts, flex alignment, animations, and responsive media queries — with instant visual feedback on every change.
  • Vanilla JavaScript DOM scripting — querySelector, event listeners, fetch calls, localStorage — with a live browser preview for instant feedback.

HTML, CSS, and JavaScript playground FAQ

Is the online HTML, CSS, and JavaScript playground free?
Yes. The HTML, CSS, and JavaScript playground is completely free — no sign-up, no local server, no VS Code Live Server extension. Just write and preview.
Do I need a local server or VS Code Live Server?
No install needed. You don't need VS Code Live Server, a local HTTP server, or Node — the browser previews your HTML, CSS, and JS files directly in an iframe.
Does the HTML, CSS, and JavaScript playground work on mobile?
Yes. The HTML, CSS, and JavaScript playground runs on desktop, tablet, and mobile browsers — the editor, preview iframe, and file tabs all adapt to smaller screens.
Is it safe to preview HTML and JavaScript here?
Yes. Your HTML, CSS, and JavaScript render inside a sandboxed preview iframe in your browser, isolated from the Coddy page around it.
How do I learn HTML, CSS, and JavaScript after trying the playground?
Tweak the sample HTML, CSS, and JS, hit Run, and watch the preview update. When you want structured practice, Coddy's interactive HTML, CSS, and JavaScript courses take you from selectors to full pages.