HTML live preview

June 18, 2026

Editing HTML in Editora just got a lot nicer. A floating browser-globe button now appears at the top-right of any .html/.htm/.xhtml editor (mirroring the Markdown preview toggle). Click it to open the current file in a detected browser such as Safari, Chrome, Firefox, or Edge, or in your system default.

The file is served over a tiny embedded web server bound to loopback only, so its sibling CSS, JS, and images load normally, and a small injected script reloads the page live as you type (it serves the buffer’s in-memory text, so you don’t even have to save).

It’s off by default; enable it under Settings → HTML Preview, then use the globe or the Open in Browser / Open in Browser… palette commands. It adds no new dependency because it uses the JDK’s built-in HTTP server.

Read the deep-dive on the blog for how it works.

Update (October 2026). HTML live preview is no longer Beta and is now on by default. The preview server also answers only the browser tab it opened, under a per-session URL prefix.