HTML Preview

Preview HTML, CSS, and JavaScript in a browser-local workspace, then render it in a sandboxed iframe that stays isolated from the parent ComUtil page.

What is HTML Preview?

HTML preview gives you a browser-first workspace for testing raw HTML, CSS, and JavaScript together. It is useful when you want to prototype UI ideas, verify layout behavior, or troubleshoot markup quickly without moving into a heavier local project setup.

How It Works

The editor stores your draft locally in the browser, then refreshes the preview by writing into a sandboxed iframe with an isolated origin. Scripts can run inside that preview, but the sandbox keeps them separated from the parent ComUtil page, and the dedicated tab path preserves that same boundary.

Common Use Cases
  • Learning and practicing HTML/CSS
  • Prototyping UI components
  • Testing responsive designs
  • Debugging CSS layout issues
  • Checking isolated HTML snippets before sharing them
Features
  • Sandboxed preview as you type
  • Full HTML/CSS/JavaScript support
  • Browser-local draft storage
  • Dedicated sandboxed tab for larger previews
Frequently Asked Questions

Can I use external CSS frameworks?

Yes, you can include CDN links for Bootstrap, Tailwind, or any other framework. Add the link tag in the head section of your HTML.

Is my code saved?

Code is saved in your browser's local storage. It persists between sessions on the same device but isn't synced across devices.