🌐 HTML Lab

Build small UI experiments: type HTML, CSS, and JavaScript — then click “Run” to see it rendered on the right.

Code

Start simple → build up Great for prototyping FileConverter UI ideas

HTML

CSS

JavaScript

Sandboxed iframe, no network access.

Preview

This is a sandboxed iframe — great for testing styling ideas before moving them into your main site.

`; doc.open(); doc.write(html); doc.close(); } runBtn.addEventListener('click', runPreview); // Run once on load runPreview();