HTML Viewer

Checking a snippet from documentation, previewing an email template where a real client is impractical, teaching markup with immediate feedback, and opening an .html file you were sent without deploying it anywhere.

Yes. <style> rules apply and <script> blocks execute, so you can prototype interactive snippets, not just static markup.

The preview renders inside a sandboxed iframe, which keeps it away from the rest of the page. That said, treat unfamiliar code with the same caution you would anywhere else — a sandbox limits damage rather than eliminating risk.

Yes, if you reference them by absolute URL and the host allows it. Relative paths will not resolve, because the preview has no directory of its own to resolve them against.

It is deliberately lighter. There are no accounts, no saved projects, and no build step — you open the page and start typing, which suits checking a snippet or previewing a file you were sent.