soapbox/docs/development/how-it-works.md

How it works

Soapbox FE is a single-page application (SPA) that runs entirely in the browser with JavaScript.

It has a single HTML file, index.html, responsible only for loading the required JavaScript and CSS. It interacts with the backend through XMLHttpRequest (XHR).

It incorporates much of the Mastodon API used by Pleroma and Mastodon, but requires many Pleroma-specific features in order to function.