# Webspaces > Webspaces turns a plain HTML file into a walkable, multiplayer 3D world. One `` - Preview, with everything marked **(preview)** below (Gaussian splats, scripting, night skies): `` Versioned preview URLs never change, so a world that pins one keeps working. ## The smallest world ```html
``` Open it in Chrome (from disk or any HTTPS host) and you spawn in as an avatar. Anyone who opens the same URL is in the world with you: avatars, voice, and live co-editing, peer to peer. When hosted over HTTP(S), also place `webspace.service.1.0.1.js` next to the HTML (copy it from https://webspaces.space/webspace.service.1.0.1.js). It is a tiny service worker that enables cross-origin isolation, which the engine needs. (Worlds saved by the engine write this file for you.) ## Objects are elements Every direct child of `` is one object in the world. Its tag chooses what it is: | Markup | Object | |---|---| | `
` | A picture (GIF/WebP animate) |
| `