Archive notice: This article covers an experimental Godot browser editor from June 2020. Browser requirements, storage options and editor support have changed since then.
The Godot Foundation released an early HTML5 build of the Godot editor after receiving Mozilla development funding. The browser build was presented as a complement to the native editor, not a replacement.
Browser and storage requirements
The early build required a Chromium-based browser or Firefox Nightly. At launch, users could choose no persistent storage, IndexedDB, Dropbox or the File System API, then create a project or import a supplied ZIP archive.

Editing and preview
The browser editor could create scenes and scripts, accept drag-and-drop assets and run the game from the play control. A Loader, Editor and Game interface switched between the project and its running output.
Developers should test browser security limits, storage persistence, export behaviour and performance before relying on a web-hosted editor for production work.